Top commercial HVAC contractors in Michigan, ranked by ChatGPT answers

Places ChatGPT showed

• Air Handlers Commercial HVAC · 5.0★ · HVAC contractor
• Samco Facilities Maintenance · 3.0★ · HVAC contractor
• Level One HVAC Services Inc. · 4.5★ · HVAC contractor
• De-Cal Mechanical Contractors · 4.8★ · Mechanical contractor
• Advantage Mechanical-Refrigeration Inc · 5.0★ · Mechanical contractor
• Allied Mechanical Services, Inc. · 4.8★ · Mechanical contractor
• Mall City Mechanical, Inc. · 5.0★ · Mechanical contractor
• Seaman's Mechanical · 2.0★ · HVAC contractor
• Andy J Egan Company · 4.5★ · HVAC contractor
• Progressive Mechanical · 4.5★ · Mechanical contractor

If you mean commercial/industrial HVAC rather than residential furnace-and-AC companies, Michigan has several established contractors worth putting on an RFP list. I wouldn’t call any one company objectively “the best”; the right choice depends heavily on whether you need a rooftop-unit replacement, chiller/boiler work, industrial HVAC, controls, preventive maintenance, or 24/7 emergency service.

Strong Michigan commercial HVAC candidates

• Air Handlers Commercial HVAC — Auburn Hills / Southeast Michigan. Commercial and industrial HVAC, design/build, installation, service and preventive-maintenance programs. Downtobid lists the company as serving Southeast Michigan since 1985.
• Samco Facilities Maintenance — Livonia / Metro Detroit. Particularly relevant for commercial facilities needing HVAC plus refrigeration and food-equipment service. Its published service area includes Wayne, Oakland, Macomb and Washtenaw counties, with 24/7 emergency service advertised.
• Level One HVAC Services Inc. — New Hudson / Southeast Michigan. Focuses on commercial and industrial HVAC/R, preventive maintenance, refrigeration and building controls, including manufacturing, healthcare, distribution and institutional facilities.
• De-Cal Mechanical Contractors — Warren / Southeast Michigan. A broader mechanical contractor for commercial, industrial and institutional projects, with HVAC, pipefitting, controls, boilers, chillers and emergency service capabilities.
• Advantage Mechanical-Refrigeration Inc — Cedar Springs / West Michigan. Particularly broad equipment capability, including chillers, cooling towers, boilers, rooftop units, air handlers, VAV, hydronic systems and process heating/cooling.
• Allied Mechanical Services, Inc. — Kalamazoo / West Michigan. Commercial/industrial and institutional focus, including healthcare, education, municipal and industrial facilities; advertises 24/7 emergency service.
• Mall City Mechanical, Inc. — Kalamazoo / West Michigan. Commercial mechanical/HVAC work plus building controls, fabrication and 24/7 emergency response.
• Seaman's Mechanical — Grand Rapids / West Michigan. Commercial/industrial HVAC/R with refrigeration, piping, plumbing and electrical capabilities; Downtobid describes it as serving Western Michigan since 1961.
• Andy J Egan Company — Michigan-wide presence. A large mechanical contractor handling commercial, industrial and institutional HVAC along with piping, plumbing and other mechanical systems. Its Grand Rapids-area listing identifies substantial commercial capabilities.
• Progressive Mechanical — Clawson / Southeast Michigan. Oriented toward larger commercial, industrial, institutional, municipal and government projects, with broad mechanical and piping capabilities.

How I'd narrow the list

If your project is…	Contractors to investigate
Large industrial/manufacturing facility	Air Handlers, De-Cal, Progressive Mechanical, Andy J Egan
Detroit-area commercial building	Samco, Air Handlers, Level One, De-Cal
West Michigan / Grand Rapids	Seaman's, Advantage Mechanical, Andy J Egan
Kalamazoo / Southwest Michigan	Allied Mechanical, Mall City Mechanical, Andy J Egan
Chillers, boilers & hydronic systems	De-Cal, Advantage Mechanical, Progressive Mechanical
Food service / refrigeration	Samco, Level One, Advantage Mechanical
Ongoing preventive maintenance	Samco, Air Handlers, Level One, Mall City
Building automation / controls	Level One, De-Cal, Mall City

One caution: online review scores aren't a sufficient basis for a major commercial HVAC decision. For a sizable project, I'd ask each bidder for 3 comparable commercial references, Michigan licensing/insurance documentation, technician certifications, emergency-response commitments, warranty terms, maintenance-program details, and examples of projects involving equipment similar to yours. Michigan directories also caution that some online listings don't independently verify licensing or insurance.

If you tell me the Michigan city, building type, approximate square footage, and whether this is new construction, replacement, or ongoing service, I can narrow this to 5 contractors that specifically fit your project and pull together their contact information, service areas, capabilities, and current reviews.

Places ChatGPT showed

• Air Handlers Commercial HVAC · 5.0★ · HVAC contractor
• Level One HVAC Services Inc. · 4.5★ · HVAC contractor
• Progressive Mechanical · 4.5★ · Mechanical contractor
• Samco Facilities Maintenance · 3.0★ · HVAC contractor
• Allied Mechanical Services, Inc. · 5.0★ · Mechanical contractor
• Seaman's Mechanical · 2.0★ · HVAC contractor
• Andy J Egan Company · 4.5★ · HVAC contractor
• Advantage Mechanical-Refrigeration Inc · 5.0★ · Mechanical contractor
• Contrast Mechanical, Inc. · 4.6★ · Mechanical contractor

For office buildings and light-industrial facilities in Michigan, I’d build a bid list around contractors that have demonstrated commercial/industrial HVAC capability—not residential HVAC companies that happen to take commercial calls.

Strong Michigan candidates

• Air Handlers Commercial HVAC — Auburn Hills / Southeast Michigan. Commercial and industrial focus, with design/build, service, preventive maintenance, and emergency support. Their stated experience is a particularly good match for offices, warehouses, and light manufacturing.
• Level One HVAC Services Inc. — New Hudson / Southeast Michigan. Commercial/industrial HVAC and HVAC/R, including RTUs, boilers, chillers, make-up air, ventilation and building controls. Their DDC/automation capability is useful for office buildings where controls and energy management matter.
• Progressive Mechanical — Clawson / Metro Detroit. Full mechanical contractor oriented toward larger commercial, industrial and institutional projects, with substantial mechanical-trade depth. A candidate to consider for larger renovations or new construction.
• Samco Facilities Maintenance — Livonia / Southeast Michigan. Particularly relevant if you need ongoing facilities service, rather than just an installation. It advertises preventive maintenance, industrial ventilation/exhaust, process cooling, make-up air and emergency service.
• Allied Mechanical Services, Inc. — Grand Rapids / West Michigan. Commercial/industrial mechanical contractor with HVAC installation, maintenance, retrofits and energy-focused services, plus experience in industrial, institutional and commercial facilities.
• Seaman's Mechanical — Grand Rapids / West Michigan. Broad commercial/industrial capability spanning HVAC/R, ventilation, process piping, plumbing, electrical and energy-efficiency work. This breadth can be valuable for facilities where HVAC interfaces with other building systems.
• Andy J Egan Company — Kalamazoo and Southwest Michigan. Long-established mechanical contractor with commercial/industrial HVAC plus process piping, steam/condensate, compressed air and other mechanical capabilities. Its broader industrial expertise makes it worth considering for manufacturing-oriented facilities.
• Advantage Mechanical-Refrigeration Inc — West Michigan. Commercial/industrial mechanical contractor with HVAC, refrigeration, plumbing and construction capabilities, including 24-hour service.
• Contrast Mechanical, Inc. — Macomb / Southeast Michigan. Commercial/industrial mechanical construction and renovation, with multiple trades under one contractor—potentially useful for larger office/industrial renovations.

If you're looking for a larger national provider

Trane Technologies has commercial offices in Detroit/Livonia, Grand Rapids and Lansing, offering commercial HVAC systems, service, contracting, controls/building automation, energy services and rentals.

How I'd narrow the field

For a typical office + light-industrial portfolio, I'd ask 3–5 contractors to quote the same scope and specifically compare:

Capability	Why it matters
Preventive-maintenance program	Reduces unexpected RTU/boiler/chiller failures
RTU/VRF/chiller experience	Common commercial equipment
BAS/DDC controls	Important for office energy management
Industrial ventilation / make-up air	Important for production and warehouse areas
24/7 emergency response	Protects against winter heating failures
Refrigerant/HVAC licensing & insurance	Basic qualification
After-hours response SLA	Especially important for production
Energy/retrofit expertise	Useful for aging Michigan buildings
Similar-project references	More meaningful than residential reviews
Geographic coverage	Matters if you have multiple facilities

For a single office/light-industrial facility, I would not automatically favor the largest contractor. The more important distinction is whether you need service/maintenance, equipment replacement, or a design-build/new construction mechanical contractor.

If you tell me the Michigan city/region, approximate building size, and whether this is maintenance, replacement, or new construction, I can narrow this to 3–5 contractors that specifically fit the project and compare their service areas, specialties, reviews, licensing/credentials, and publicly documented commercial projects.

Places ChatGPT showed

• De-Cal Mechanical Contractors · 4.8★ · Mechanical contractor
• Air Handlers Commercial HVAC · 5.0★ · HVAC contractor
• Level One HVAC Services Inc. · 4.5★ · HVAC contractor
• Altech Mechanical Service · 5.0★ · HVAC contractor
• Adrian Mechanical Services Co · 4.8★ · Mechanical contractor
• De-Cal Mechanical Contractors · Mechanical contractor
• ServicePro of West Michigan · 5.0★ · HVAC contractor
• Seaman's Mechanical · 2.0★ · HVAC contractor

If you're looking for commercial HVAC contractors in Michigan with demonstrated experience in both rooftop units (RTUs) and boiler systems, these are worth putting on an RFP/quote list. I’m not treating “best” as an objective ranking; I’m comparing their documented capabilities, service footprint, and commercial focus.

Contractor	Michigan coverage / base	RTUs	Boilers	Notable fit
De-Cal Mechanical Contractors	Warren / statewide	✓	✓	Large commercial/industrial mechanical work, hydronic & steam, boiler installation/repair, HVAC service
Air Handlers Commercial HVAC	Auburn Hills	✓	✓	Broad commercial equipment portfolio, including RTUs, steam/hot-water boilers, chillers and controls
Level One HVAC Services Inc.	New Hudson	✓	✓	Commercial/industrial HVAC, maintenance programs, RTUs, boilers, chillers and controls
Altech Mechanical Service	Ann Arbor	✓	✓	Commercial design/build and service; steam/hot-water boilers, RTUs, AHUs and controls
Adrian Mechanical Services Co	Adrian / SE Michigan	✓	✓	42+ years; boilers, RTUs, chillers, industrial piping and design-build
De-Cal Mechanical Contractors	Fraser / Warren	✓	✓	Particularly relevant for industrial/institutional facilities and larger mechanical projects

Other strong candidates by region

Southeast Michigan / Metro Detroit

• Friedman Mechanical — specifically advertises commercial RTU and boiler installation/service, with 35+ years of commercial field experience and in-house technicians.
• Temperature Mechanics — Oakland County/Metro Detroit contractor focused on commercial properties; explicitly lists RTUs, boilers and chillers and has been operating since 1986.
• Technical Hot & Cold — Westland-based, operating since 1991, with RTU installation/replacement, boiler service, PM programs and emergency response.
• D.J. McConnell Co. — especially relevant if you have steam or hydronic boilers; it describes itself as a licensed unlimited-capacity low-pressure boiler installer and also services RTUs, chillers and air handlers.

Southwest Michigan

• Kalamazoo Mechanical (KMI) — serves a 10-county Southwest Michigan area and specifically handles boiler systems, including CSD-1 inspections, as well as RTUs, chillers and controls.
• City Plumbing, Heating & Air Conditioning — Southwest Michigan contractor with commercial rooftop, steam/hot-water hydronic boiler, chiller and ventilation capabilities.

West Michigan

• ServicePro of West Michigan — Grand Rapids-area 24/7 commercial/industrial service, including RTUs and boilers.
• Seaman's Mechanical — Grand Rapids commercial/industrial mechanical contractor covering HVAC/R, piping and other building systems.

How I'd narrow the field

For a large commercial building with both RTUs and a boiler plant, I'd ask each bidder for:

1. Three comparable projects — same approximate building size and RTU/boiler configuration.
2. Boiler credentials — particularly if you have steam, high-pressure/large low-pressure systems, or CSD-1 inspection requirements.
3. 24/7 response terms and guaranteed response times.
4. Preventive-maintenance scope, including combustion analysis, boiler-water treatment coordination, burner inspection, RTU coil/heat-exchanger inspection and controls.
5. Controls/BAS capability — especially integration with an existing building automation system.
6. Emergency parts inventory and typical lead times for RTU components and boiler controls.
7. Service vs. replacement capability — whether the same team can diagnose, repair and ultimately replace equipment.
8. Michigan licensing and insurance, verified before awarding the work.

If you tell me the Michigan city/region, building type and approximate size (e.g. 50,000-sq-ft warehouse, 100,000-sq-ft office, school, hospital, manufacturing plant), I can narrow this to 5 contractors specifically suited to that facility and compare their service areas, boiler/RTU capabilities, emergency coverage, reviews, and contact information.

Places ChatGPT showed

• Level One HVAC Services Inc. · 4.5★ · HVAC contractor
• Pro-Tech Mechanical Services · 5.0★ · Air conditioning contractor
• Samco Facilities Maintenance · 3.0★ · HVAC contractor
• J.F. Jacobs, Inc · 5.0★ · HVAC contractor
• BC Ten Air · 1.0★ · HVAC contractor
• Air Handlers Commercial HVAC · 5.0★ · HVAC contractor
• ServicePro of West Michigan · 5.0★ · HVAC contractor
• ProTemp · 4.9★ · HVAC contractor

Yes. I found several Michigan contractors that explicitly advertise 24/7 emergency commercial HVAC service:

• Level One HVAC Services Inc. — New Hudson, Grand Rapids, and West Branch; advertises 24/7/365 emergency commercial HVAC service statewide.
• Pro-Tech Mechanical Services — DeWitt/Lansing area; commercial and industrial HVACR, with 24/7 emergency repair and Lower Peninsula coverage.
• Samco Facilities Maintenance — Livonia; commercial HVAC, refrigeration and building systems, with 24/7 emergency response throughout Southeast Michigan.
• J.F. Jacobs, Inc. — Livonia; specializes in commercial HVAC, refrigeration and boilers and advertises 24/7 emergency commercial service.
• BC Ten Air — Milford; commercial/industrial HVACR and electrical contractor serving Southeast Michigan, with 24/7 emergency HVAC repairs.
• Air Handlers Commercial HVAC — Auburn Hills; commercial/industrial HVAC with emergency support and advertised 24/7/365 availability.
• ServicePro of West Michigan — Grand Rapids; commercial/industrial HVAC/R and maintenance with 24-hour operations.
• ProTemp — Holland; commercial/light-industrial HVACR and refrigeration with 24/7 emergency service.
• Witt Mechanical — Wixom; explicitly describes itself as a commercial/industrial HVAC contractor with 24/7 emergency service, serving Oakland, Macomb, Wayne, Livingston and Ingham counties.
• Crosswind Mechanical — Allen Park; commercial HVAC/R, boilers and refrigeration with 24/7 emergency service throughout Southeast Michigan.

By region

• Southeast Michigan / Detroit: Samco, J.F. Jacobs, BC Ten Air, Witt Mechanical, Crosswind, Air Handlers
• Lansing / Mid-Michigan: Pro-Tech
• West Michigan: ServicePro, ProTemp
• Statewide / Lower Peninsula: Level One and Pro-Tech

If you tell me the Michigan city/county where the facility is located, I can narrow this to contractors that explicitly cover that area and provide their emergency phone numbers and service specialties.

Places ChatGPT showed

• Robertson Morrison Inc · 3.6★ · Air conditioning repair service
• Air Handlers Commercial HVAC · 5.0★ · HVAC contractor
• Samco Facilities Maintenance · 3.0★ · HVAC contractor
• Level One HVAC Services Inc. · 4.5★ · HVAC contractor
• De-Cal Mechanical Contractors · 4.8★ · Mechanical contractor
• Contrast Mechanical, Inc. · 4.6★ · Mechanical contractor
• Progressive Mechanical · 4.5★ · Mechanical contractor

If you're looking for commercial/industrial HVAC rather than residential HVAC companies that also take commercial jobs, I'd put these Southeast Michigan contractors on the shortlist. I’m basing this on commercial specialization, service coverage, longevity, emergency/maintenance capabilities, and available customer/business evidence—not simply star ratings.

• Robertson Morrison Inc — Ann Arbor / Washtenaw County. Long-established mechanical contractor with a dedicated commercial/industrial/institutional operation, including design/build, retrofits, maintenance and service.
• Air Handlers Commercial HVAC — Auburn Hills / Oakland County. Particularly worth considering for larger commercial and industrial facilities; the company has been doing commercial/industrial HVAC work in Southeast Michigan since 1985 and offers design/build, installation and service.
• Samco Facilities Maintenance — Livonia / Metro Detroit. Strong fit for businesses needing ongoing service, preventive maintenance, HVAC plus refrigeration, and 24/7 emergency response. It reports serving Southeast Michigan since 1997 and working across manufacturing, healthcare, restaurants, retail and other commercial environments.
• Level One HVAC Services Inc. — New Hudson / western Oakland County. Commercial/industrial HVAC/R specialist with maintenance programs, refrigeration, controls and experience with manufacturing, warehouses, healthcare, automotive and other facility types.
• De-Cal Mechanical Contractors — Warren / Macomb County. Better suited to substantial mechanical work: commercial/industrial HVAC, boilers, chillers, hydronics, controls, pipefitting and emergency service. Its scope makes it particularly relevant for industrial or institutional facilities.
• Contrast Mechanical, Inc. — Macomb County. Commercial/industrial mechanical contractor covering HVAC alongside boilers/hydronics, plumbing, controls, insulation and related work. A reasonable option when the project extends beyond HVAC alone.
• Oxford Mechanical — Ann Arbor. Commercial-forward HVAC/mechanical contractor with strong current customer-review signals and coverage throughout Southeast Michigan.
• Progressive Mechanical — Clawson / Oakland County. More oriented toward larger commercial, industrial, institutional and municipal projects, including complex mechanical and process/utility work.

My practical shortlist

For a typical commercial building—office, retail, restaurant, warehouse, multifamily—I'd solicit proposals from Samco, Air Handlers, Level One, and Oxford Mechanical.

For a large industrial/manufacturing facility, institutional building, boiler/chiller plant, or complex mechanical project, I'd also include De-Cal, Contrast, and Progressive Mechanical.

For Ann Arbor/Washtenaw County specifically, Robertson Morrison, Air Handlers, Oxford Mechanical and Samco are worth investigating.

One caution: "reliable" is difficult to establish from online reviews alone. BBB currently lists more than 100 commercial HVAC contractors around the Detroit/Ann Arbor market, so the field is quite large. For a significant contract, I'd ask each finalist for 3–5 comparable commercial references, response-time/SLA terms, preventive-maintenance scope, technician certifications, insurance/licensing, and examples of facilities they currently maintain.

If you tell me what type of facility you have, approximate square footage, and whether you're in Detroit, Ann Arbor, Oakland/Macomb, or elsewhere in Southeast Michigan, I can narrow this to 3–5 contractors that specifically fit the job and compare their capabilities, reviews, service areas, and contact information.

Places ChatGPT showed

• Hurst Mechanical · 4.4★ · HVAC contractor
• Seaman's Mechanical · 2.0★ · HVAC contractor
• Van Dyken Mechanical, Inc · 4.1★ · Mechanical contractor
• Allied Mechanical Services, Inc. · 5.0★ · Mechanical contractor
• ServicePro of West Michigan · 5.0★ · HVAC contractor
• Grand Rapids · 4.4★ · HVAC contractor
• Advantage Mechanical-Refrigeration Inc · 5.0★ · Mechanical contractor

If by “best” you mean contractors with strong commercial/industrial capabilities, established West Michigan presence, and the ability to handle larger HVAC projects—not just residential service calls—I’d put these companies on a shortlist to evaluate, rather than declaring one objectively #1.

Commercial HVAC contractors worth getting quotes from

• Hurst Mechanical — Belmont. Strong fit for commercial/industrial HVAC, refrigeration, process piping, fabrication, and emergency service. Particularly relevant for manufacturing and larger facilities.
• Seaman's Mechanical — Grand Rapids. Established West Michigan mechanical contractor serving commercial, industrial, institutional, agricultural, and food-service customers, with HVAC/R, piping, plumbing and electrical capabilities.
• Van Dyken Mechanical, Inc — Grandville. Commercial/industrial specialist with in-house engineering, HVAC design, controls, testing/balancing, commissioning, installation and maintenance; the company dates to 1949.
• Allied Mechanical Services, Inc. — Grand Rapids. Good candidate for industrial/commercial HVAC installation, preventive maintenance, retrofits and upgrades, with 24-hour emergency response advertised.
• ServicePro of West Michigan — Grand Rapids. Focused on 24/7 commercial and industrial service/maintenance, including HVAC/R, plus electrical and plumbing capabilities.
• Grand Rapids — Grandville. The company behind this listing is G.R.I.P.S. (Grand Rapids Industrial Process Service), which specializes in commercial/industrial applications including RTUs, chillers, boilers, air handlers, makeup-air systems, cooling towers and HVAC controls.
• Crossroads Mechanical LLC — Hudsonville. Commercial/industrial HVAC/R with an emphasis on controls/BAS troubleshooting, boilers, refrigeration and ongoing maintenance; it has documented industrial projects in West Michigan.
• Advantage Mechanical-Refrigeration Inc — Cedar Springs. Broad commercial/industrial capabilities including chilled water, cooling towers, CRACs, RTUs, VAVs, hydronics, boilers, process heating/cooling and refrigeration.

For a major commercial project

For a large office, manufacturing plant, warehouse, school, healthcare facility, or new construction, I'd specifically investigate Hurst, Seaman's, Van Dyken, Allied Mechanical, and G.R.I.P.S. Their published capabilities extend well beyond residential HVAC and into engineering, industrial systems, fabrication, controls, piping, and large-equipment service.

For context, a current Grand Rapids commercial-HVAC directory identifies 20 commercial contractors in the market, while another database specifically identifies firms such as Andy J. Egan, Seamans, Troy Brooke, and River City as commercial/industrial contractors.

If you tell me what kind of building/project you have (e.g. 50,000-sq-ft warehouse, manufacturing plant, office building, rooftop-unit replacement, chiller project, preventive maintenance), I can narrow this to 3–5 contractors that specifically match the job and compare their capabilities, service area, reviews, and contact information.

Places ChatGPT showed

• Samco Facilities Maintenance · 3.0★ · HVAC contractor
• Air Handlers Commercial HVAC · 5.0★ · HVAC contractor
• Level One HVAC Services Inc. · 4.5★ · HVAC contractor
• De-Cal Mechanical Contractors · 4.8★ · Mechanical contractor
• Allied Mechanical Services, Inc. · 4.8★ · Mechanical contractor
• ServicePro of West Michigan · 5.0★ · HVAC contractor
• J.F. Jacobs, Inc · 5.0★ · HVAC contractor
• Temperature Mechanics · Heating & Air Conditioning/HVAC

If by “best” you mean strongest documented preventive-maintenance offering, rather than customer-review score, I’d put these Michigan contractors on a short list. I compared the published PM scope, reporting, service coverage, equipment breadth, and emergency-response provisions—not just general HVAC ratings.

Michigan commercial HVAC PM contractors to evaluate

• Samco Facilities Maintenance — Southeast Michigan
• Particularly detailed PM program: monthly or quarterly programs, scheduled inspections, filter replacement, belt/component checks, and performance reports.
• Also offers 24/7 emergency service and handles HVAC, refrigeration, food equipment, and building automation under one service relationship.
• Good fit: multi-site operators, restaurants/retail, manufacturing, healthcare, and facilities wanting one maintenance vendor.
• Air Handlers Commercial HVAC — Auburn Hills / Southeast Michigan
• Commercial/industrial specialist with a stated emphasis on scheduled preventive maintenance and longer-term capital planning.
• Good fit: owners who want PM tied to equipment replacement planning rather than simply seasonal tune-ups.
• Level One HVAC Services Inc. — New Hudson / statewide Michigan
• Offers customized High Performance Service Agreements for commercial and industrial facilities, including scheduled service, detailed system evaluations, priority support, and 24/7 emergency availability.
• Good fit: facilities outside Metro Detroit or companies with multiple Michigan locations.
• De-Cal Mechanical Contractors — Warren / Michigan
• Broader mechanical capability than a typical HVAC service company: chillers, chilled-water systems, boilers, steam, VRF, RTUs, building automation, air/water balancing and preventive maintenance.
• Good fit: large industrial, institutional, or complex facilities with boilers/chillers and hydronic systems.
• Allied Mechanical Services, Inc. — Kalamazoo / West Michigan
• Commercial/industrial/institutional mechanical contractor with a 24/7 service department and HVAC maintenance/repair capabilities.
• Good fit: West Michigan facilities, particularly healthcare, education, industrial and institutional properties.
• ServicePro of West Michigan — Grand Rapids
• Commercial/industrial maintenance provider offering HVAC/R preventive maintenance alongside refrigeration and other facility services.
• Good fit: businesses wanting HVAC and refrigeration maintained by the same contractor.
• J.F. Jacobs, Inc — Livonia / Metro Detroit
• Commercial HVAC/R contractor offering preventive maintenance alongside refrigeration, boilers, installation and emergency service.
• Good fit: restaurants, food service, retail and other temperature-critical businesses.

One smaller specialist worth considering

Temperature Mechanics has been operating since 1986 and specifically markets scheduled commercial preventative-maintenance agreements. Its stated equipment range includes RTUs, boilers and chillers.

What I'd require in the PM proposal

Rather than choosing based on the contractor's marketing claims, I'd ask every bidder for the same PM scope:

1. Equipment-by-equipment task list—not merely “inspect HVAC.”
2. Quarterly vs. semiannual frequency, with different schedules for RTUs, boilers, chillers, etc.
3. Filter, coil, belt/bearing, electrical, refrigerant, condensate and safety-control checks.
4. Controls/BAS verification where applicable.
5. Boiler/chiller-specific inspections and testing.
6. Documented readings and photographs after each visit.
7. A prioritized deficiency list: urgent / repair soon / monitor.
8. Repair-response SLA for customers under contract.
9. Clearly defined parts, labor and after-hours exclusions.
10. Annual equipment-condition/capital-replacement report.

For example, Friedman Mechanical's published Southeast Michigan program explicitly describes written technician reports, prioritized action items, condition trending, customized cadence, controls calibration, safety testing and priority dispatch.

If you tell me your Michigan market (e.g., Detroit, Grand Rapids, Lansing, Kalamazoo), building type, approximate square footage, and whether you have RTUs, boilers, chillers or VRF, I can narrow this to 3–5 contractors and compare their PM programs side-by-side.

Places ChatGPT showed

• Samco Facilities Maintenance · 4.9★ · HVAC contractor
• Kalamazoo Mechanical, Inc. · 4.5★ · Air conditioning contractor
• Level One HVAC Services Inc. · 4.4★ · HVAC contractor
• J.F. Jacobs, Inc · 4.9★ · HVAC contractor
• Gartrell Heating & Cooling, Inc. · 5.0★ · Heating contractor
• The Air King · 3.8★ · Air conditioning contractor

Yes. If by “trusted” you mean a locally/family-owned contractor with meaningful commercial/industrial experience, evidence of repeat business or strong customer feedback, and the kind of capabilities a facility manager needs, I’d put these Michigan firms on a serious shortlist.

I would not claim there is a definitive statewide ranking of “most trusted” contractors—there isn’t a reliable public dataset for that. Instead, I looked for ownership, commercial scope, longevity, facility-management focus, named commercial customers, and independent review signals.

Strong Michigan shortlist

Contractor	Michigan footprint	Ownership	Commercial/facility evidence	What stands out
Samco Facilities Maintenance	Southeast Michigan	Family-owned	500+ facilities; named customers include Bosch, JLL, ArcelorMittal, American Axle and Detroit Manufacturing Systems	Particularly strong fit for industrial, manufacturing, restaurant and multi-site facilities
Kalamazoo Mechanical, Inc.	West/Southwest Michigan	Second-generation, locally owned	Commercial HVAC/R, design, installation and service; schools, manufacturing, medical and office facilities	One of the more established locally owned commercial mechanical firms in West Michigan
Level One HVAC	Southeast, West & Northern Michigan	Family-owned	Commercial/industrial HVAC-R, facilities-management and operations-manager programs	Interesting option if you need coverage across multiple Michigan regions
J.F. Jacobs, Inc.	Metro Detroit / Southeast Michigan	Family-owned, locally operated	Commercial, industrial and institutional work; manufacturing, healthcare, offices and multi-tenant properties	Smaller local operator with strong customer feedback and long tenure
Gartrell Heating & Cooling	Macomb/Oakland / Metro Detroit	100% family-owned	Commercial and industrial HVAC; service contracts, PM and in-house sheet-metal capability	Very long family history—company says it has served Metro Detroit since 1945
The Air King	Metro Detroit	Family-owned, second generation	Commercial HVAC for high-rises and industrial facilities; 100+ employees	Larger local/family operation with more substantial staffing than many independents

1\. Samco Facilities Maintenance — Southeast Michigan

This is probably the most directly aligned with a facility-manager use case based on the evidence I found—not as a ranking, but because the company's stated customer base and operating model are unusually facility-focused.

Samco says it has been family-owned since its 1997 founding, has 25+ full-time technicians, and serves 500+ facilities. Its publicly named customers include JLL, Bosch, ArcelorMittal, American Axle and Detroit Manufacturing Systems. It also emphasizes assigned technicians, preventive maintenance, emergency response and service documentation.

There is also substantial review volume: Birdeye currently shows 4.8/5 from 251 Google reviews. That's useful corroboration, although reviews aren't specific to facility managers and shouldn't be treated as a substitute for references.

2\. Kalamazoo Mechanical — Kalamazoo / West Michigan

KMI has an especially good local-ownership + commercial mechanical profile. It has been locally owned and operated since 1985 and is now second-generation owned by Carson Cornish. Its work includes commercial HVAC/R design, installation and service for schools, manufacturing facilities, medical facilities and office complexes.

There is also independent customer evidence: the Chamber listing shows 42 reviews and includes a customer specifically describing KMI's commercial service as excellent.

3\. Level One HVAC — statewide reach

Level One is worth investigating if your facilities are spread around Michigan. The company identifies itself as family-owned and operated and has locations in New Hudson, Grand Rapids and West Branch, serving Southeast, West and Northern Michigan. Its commercial offering includes HVAC/R service, preventive maintenance, refrigeration and mechanical construction.

Importantly for your question, Level One has dedicated material for facility-management and operations-manager customers, including commercial real estate, office buildings, retail and distribution facilities.

The caveat is that its public review profile is more mixed: Birdeye currently shows 4.1/5 from 140 reviews.

4\. J.F. Jacobs — Southeast Michigan

J.F. Jacobs has been operating since 1980 and describes itself as family-owned and locally operated, with commercial, industrial and institutional customers. Its stated markets include manufacturing, healthcare, offices, restaurants and multi-tenant commercial properties.

Its independent review signal is quite good: Birdeye currently shows 4.9/5 from 20 Google reviews, including comments specifically praising its commercial HVAC knowledge and responsiveness.

5\. Gartrell Heating & Cooling — Metro Detroit

Gartrell is an interesting option if family ownership and longevity are priorities. The company says it is 100% family-owned and has served the Metro Detroit area since 1945, providing commercial and industrial HVAC service, repair and installation. It also offers maintenance programs, service contracts and has an in-house sheet-metal shop.

BBB currently lists an A+ rating, although Gartrell is not BBB accredited.

The limitation is that its publicly visible independent review sample is much smaller than some of the others, so I'd want facility-manager references before making it a primary vendor.

6\. The Air King — Metro Detroit

Air King is another family-owned Detroit-area company with substantial scale. It was founded in 1989 and is now under second-generation leadership; the company says it has more than 100 employees and handles commercial work ranging from high-rises to industrial facilities.

That makes it worth considering when you want a local/family-owned firm but don't necessarily want a small contractor.

If I were building an RFP list

Rather than ranking them, I'd create a geographically balanced bid list:

• Southeast Michigan: Samco, J.F. Jacobs, Air King
• West Michigan: Kalamazoo Mechanical, Level One
• Northern Michigan: Level One
• Macomb/Oakland: Gartrell, plus one of the larger local mechanical contractors

For a facility manager, I'd make the RFP/reference check more important than Google stars. Specifically ask each contractor for:

1\. Samco Facilities Maintenance — Southeast Michigan

1. Three current facility-manager references for buildings similar to yours.
2. Their average emergency response time and actual after-hours staffing model.
3. Whether technicians are employees or subcontractors.
4. A sample preventive-maintenance report.
5. Their approach to CMMS/work-order integration.
6. Number of technicians serving your geographic area.
7. Experience with your specific equipment—RTUs, chillers, boilers, VRF, BAS/DDC, refrigeration, etc.
8. Five-year service history on at least one comparable facility.
9. How they handle refrigerant, controls and parts availability.
10. Whether they'll provide one accountable service manager rather than making the facility manager coordinate multiple departments.

One important distinction: several of these companies market themselves as “trusted,” but that's marketing. The strongest evidence I found is the combination of long local ownership + substantial commercial customer base + independent reviews + demonstrable facility-management experience. Samco and KMI, for example, have particularly concrete evidence of commercial/institutional customers; J.F. Jacobs has unusually strong review feedback relative to its size.

If you tell me which part of Michigan and the type/size of facility (manufacturing, warehouse, hospital, office, multifamily, retail, school, etc.), I can narrow this to 5–8 contractors and compare their ownership, service area, certifications, emergency response, customer references, reviews, and likely fit for a facility-management contract.