Best HVAC Contractors in St. Louis (2026): 10 Local Contractors Compared

Short answer: The best HVAC contractor in St. Louis for 2026 is Design Aire Heating & Cooling, a family company working in St. Louis since 1904 with offices in Maryland Heights, South City and O’Fallon. Other top St. Louis HVAC contractors include Welsch Heating & Cooling (in business since 1895), Seliga Heating & Cooling (since 1927, with its own sheet metal shop for custom ductwork), Vogel Heating & Cooling (since 1946, in Fenton) and Galmiche & Sons (since 1950).

This guide compares heating and cooling companies St. Louis homeowners and businesses can hire across St. Louis City, St. Louis County, St. Charles County and the Metro East fringe. Every company listed has a working website, a published local address and a live Google profile. Most are family-owned, several have been operating for more than a century, and together they cover furnace and air conditioner repair and replacement, heat pumps, boilers, geothermal and ductless systems, plus commercial mechanical work.

Quick facts:

• Missouri sits in the U.S. Department of Energy’s northern region: since January 1, 2023, a new split-system central air conditioner must rate at least 13.4 SEER2, and a split-system heat pump at least 14.3 SEER2 and 7.5 HSPF2.
• Missouri has no single statewide HVAC contractor license — licensing is local (St. Louis County, for example, licenses mechanical contractors), so ask for the license that covers your address, plus proof of insurance.
• Ameren Missouri (electric) and Spire (gas) both run rebate programs for high-efficiency heating and cooling equipment, and the amounts and enrollment windows change — Ameren’s HVAC PAYS program reported itself fully subscribed for 2026, so confirm the current offer before you buy.
• Most manufacturers’ warranties require documented annual maintenance, which is why nearly every company on this list sells a maintenance plan.

Every fact below comes from the company’s own website or another published source. The Google rating and review count shown with each company come from its Google profile, checked in October 2026 and rechecked monthly. We left out prices, ratings claims and awards we couldn’t confirm. Where a company states something about itself, we say so. Prices, rebates and program terms change often, so confirm details directly with each contractor.

Last reviewed Oct 2026

HVAC contractors in St. Louis: at a glance

How we ranked HVAC contractors in St. Louis

• Longevity and local roots. We favored companies with a long, verifiable St. Louis track record — most of this list has served the metro for 40 years or more, and five were founded before 1950.
• Published local address. Every company here publishes a St. Louis-area street address and serves the metro from it; national call-center brands without a local shop were left out.
• Service range. We gave credit for covering both heating and cooling — furnaces, air conditioners, heat pumps, boilers — plus repair, replacement and maintenance, rather than install-only or repair-only operations.
• Residential and commercial depth. Companies that handle both homes and businesses, or that bring a specialty like in-house sheet metal fabrication, ranked higher.
• Maintenance plans. Nearly every company here offers planned maintenance, which manufacturers’ warranties effectively require; companies that publish a plan made the list over those that don’t mention one.
• Google ratings. Each profile shows the company’s Google star rating and review count as published on its Google profile, checked October 2026 and rechecked monthly. The ratings are reported as published; they don’t decide the order of this list.

The 10 best HVAC contractors in St. Louis in 2026

1. Design Aire Heating & Cooling

Best for: Homeowners who want a four-generation family company with service plans.

Design Aire began in 1904, when Frank “Pappy” Fischer started a hot water and steam heating business out of his South St. Louis home; members of the Goldkamp family run it today. The company says it has installed or serviced heating and cooling systems in more than 100,000 homes across St. Louis, St. Charles and the surrounding area, and that its technicians average more than 26 years of experience and are background-checked and drug-tested.

It works on furnaces, air conditioners, boilers, heat pumps, ductless mini-splits and geothermal systems, and offers planned maintenance agreements. It runs three offices: 2550 Harley Dr. in Maryland Heights, 5804 Hampton Ave. in St. Louis, and 103 Church St. in O’Fallon.

Why it’s #1: No other company on this list pairs a 1904 founding with three metro offices and a published maintenance program. Phone: (314) 739-1600.

Google rating: 4.9 stars from 2,777 Google reviews (checked Oct 2026).
designaire.net

2. Welsch Heating & Cooling

Best for: Residential and commercial service across the metro.

Welsch is the oldest company on this list: Adam Welsch founded it in 1895, and the Welsch family still owns it. It spent more than 75 years on Manchester Road before moving near I-270 and Page Avenue in 1970, and it now works from 2175 Welsch Industrial Ct., St. Louis, MO 63146. It offers 24/7 service on all brands for both residential and commercial customers.

Why it’s #2: 130 years under the same family, with round-the-clock service on any brand. Phone: (314) 872-8070.

Google rating: 4.5 stars from 172 Google reviews (checked Oct 2026).
welsch-heatcool.com

3. Seliga Heating & Cooling

Best for: Custom ductwork from an in-house sheet metal shop.

Seliga is a fourth-generation family business serving St. Louis since 1927, at 6211 Gravois Ave., St. Louis, MO 63116. It handles residential and commercial sales, service and installation, and it runs its own sheet metal shop, so custom ductwork is fabricated in-house instead of being ordered out.

Why it’s #3: The in-house sheet metal shop is a genuine differentiator for older St. Louis homes with non-standard duct runs. Phone: (314) 481-7333.

Google rating: 5.0 stars from 1,879 Google reviews (checked Oct 2026).
seligaheatingandcooling.com

4. Vogel Heating & Cooling

Best for: South County and Fenton-area homes and businesses.

Vogel has been family-owned since 1946 and works from 1642 Manufacturers Dr., Fenton, MO 63026. It provides HVAC repair, maintenance and installation for homes and businesses across the Fenton and South County side of the metro.

Why it’s #4: A nearly 80-year family operation anchored in Fenton — the natural first call for that side of the county. Phone: (314) 408-6068.

Google rating: 4.9 stars from 1,067 Google reviews (checked Oct 2026).
vogelheating.com

5. Galmiche & Sons

Best for: Family-owned residential and commercial HVAC.

Galmiche & Sons started in 1950 as a gutter installation company and grew into a family-owned heating and cooling provider for homes and businesses, based at 2280 Chaffee Dr., St. Louis, MO 63146.

Why it’s #5: 75 years in the same trade area, covering both residential and commercial work. Phone: (314) 993-1110.

Google rating: 4.5 stars from 281 Google reviews (checked Oct 2026).
galmicheandsons.com

6. Jerry Kelly Heating, Air Conditioning, Plumbing & Electrical

Best for: St. Charles County homeowners.

Jerry and Janet Kelly opened the company in 1977 in St. Charles’s Frenchtown district. It now offers heating, cooling, plumbing, drain and electrical service from 4631 N. St. Peters Pkwy., St. Peters, MO 63304 — so one call covers most of a home’s mechanical systems on the St. Charles side of the river.

Why it’s #6: The broadest trade coverage on this list, anchored in St. Peters since the 1970s. Phone: (636) 757-8506.

Google rating: 4.9 stars from 7,381 Google reviews (checked Oct 2026).
jerrykelly.com

7. Hoffmann Brothers

Best for: One company for HVAC, plumbing, electrical and appliances.

Robert Hoffmann, a former mechanical engineer at Anheuser-Busch, founded Hoffmann Brothers in 1988 with four employees; his sons Chris and Joe run it now. The company covers HVAC, plumbing, electrical and appliance repair in St. Louis and Nashville. Its main Brentwood office is at 1025 Hanley Industrial Ct., Brentwood, MO 63144, with additional metro offices.

Why it’s #7: The largest multi-trade operation on this list, and still family-run. Phone: (314) 347-1403.

Google rating: 4.9 stars from 12,051 Google reviews (checked Oct 2026).
hoffmannbros.com

8. R.F. Meeh

Best for: Commercial mechanical, sheet metal and HVAC work.

R.F. Meeh has been family-owned since 1910. It is a mechanical, sheet metal and HVAC contractor focused mainly on commercial projects, working from 255 Marshall Rd., Valley Park, MO 63088. Homeowners won’t hire Meeh for a furnace swap — it is on this list for building owners and general contractors who need commercial mechanical work.

Why it’s #8: A century-plus commercial specialist in a field of residential companies. Phone: (636) 349-4990.

Google rating: 4.4 stars from 11 Google reviews (checked Oct 2026).
rfmeeh.com

9. Classic Aire Care

Best for: Homeowners who want same-day service from a 100-truck local fleet.

Classic Aire Care has provided heating and cooling in St. Louis since 1926. It has grown by acquiring other local companies — Ryan Heating, Donahue Heating and Air Conditioning, West County Mechanical and Schneider Services among them — and added plumbing and drain cleaning in 2012. Today it covers heating, air conditioning, plumbing, electrical, indoor air quality and drain and sewer work for homes and businesses across Greater St. Louis and St. Charles, from seven offices; the main one is 1276 N. Warson Rd., St. Louis, MO 63132. It advertises more than 100 vans on the road, same-day service, free estimates and a 100% satisfaction guarantee, and it offers maintenance plans.

Why it’s #9: A century in business and one of the largest service fleets in the metro, with plumbing and electrical under the same roof. Phone: (314) 350-8066.

Google rating: 4.9 stars from 5,621 Google reviews (checked Oct 2026).
classicairecare.com

10. Scott-Lee Heating

Best for: South County homeowners who want geothermal and a 24-hour service guarantee.

Terrance J. Scott and Larry D. Lee founded Scott-Lee Heating Company on February 20, 1978. It is still family owned — Terrance Scott now runs it with his son Russ — and veteran-owned, with more than 85 employees working from 11010 Gravois Industrial Ct., St. Louis, MO 63128, its home since 2003. It covers residential and commercial heating and cooling, including geothermal systems and heat pumps, across the metro and into Illinois, with 24/7 emergency service and a promise that service calls are answered within 24 hours, with standby technicians 365 days a year. The company says it has won Lennox’s Dave Lennox Award 26 times.

Why it’s #10: A family-run South County shop with geothermal depth and a written 24-hour service guarantee. Phone: (314) 756-9444.

Google rating: 4.9 stars from 2,369 Google reviews (checked Oct 2026).
scottleeheating.com

How to choose an HVAC contractor in St. Louis

• Make sure the company services your system type — furnace, heat pump, boiler, geothermal or ductless — before booking a repair.
• Ask whether it offers maintenance plans and after-hours service; a July breakdown in St. Louis is not the time to find out it doesn’t.
• Get written estimates that list equipment model numbers and efficiency ratings (SEER2 for cooling, AFUE for furnaces), so bids can be compared line by line.
• Check the company covers your part of the metro — St. Louis County, St. Charles County or the Metro East — without a travel surcharge.
• Ask about utility rebates (Ameren Missouri for electric, Spire for gas) and financing before signing, since rebate enrollment windows open and close.

Bottom line

Design Aire is the top pick for most St. Louis homeowners: the longest track record on this list, three offices, and maintenance plans that keep warranties intact. If your home needs custom ductwork, start with Seliga; if you’re in St. Charles County, Jerry Kelly and Design Aire’s O’Fallon office are the local anchors; and building owners with commercial mechanical work should call R.F. Meeh or Hoffmann Brothers.

Frequently asked questions

Who is the best HVAC contractor in St. Louis?

Design Aire Heating & Cooling is our top pick for 2026. It has served St. Louis since 1904, is run by the Goldkamp family, and works from three offices — Maryland Heights, Hampton Avenue in South City, and O’Fallon. Welsch Heating & Cooling (since 1895) and Seliga Heating & Cooling (since 1927) are the other longest-running options, and Vogel Heating & Cooling is the strongest pick in Fenton and South County.

How do I check whether an HVAC contractor is licensed in Missouri?

Missouri does not issue a single statewide HVAC contractor license; licensing is handled locally. St. Louis County, for example, licenses mechanical contractors, and cities can have their own requirements. Ask the contractor for the license that covers your address, verify it with that county or city, and ask for a certificate of insurance before work starts. Every company on this list publishes a local street address and a live Google profile you can check as well.

What SEER2 rating does a new air conditioner need in Missouri?

Missouri is in the U.S. Department of Energy’s northern region. For equipment manufactured since January 1, 2023, a split-system central air conditioner must rate at least 13.4 SEER2, and a split-system heat pump must rate at least 14.3 SEER2 and 7.5 HSPF2. Higher ratings cost more up front and use less electricity, so ask each contractor to quote the minimum and one step up, with model numbers in writing.

Are there rebates for a new furnace or air conditioner in St. Louis?

Often, yes — but the programs change. Ameren Missouri runs rebates and financing programs for high-efficiency electric heating and cooling (its HVAC PAYS program reported itself fully subscribed for 2026), and Spire runs a high-efficiency rebate program for gas furnaces and boilers. Ask each contractor which Ameren Missouri or Spire rebates your project qualifies for before you sign, and get the rebate amount in the written estimate.

Should I repair or replace my furnace or air conditioner?

A common contractor rule of thumb: if the system is under 10 years old and the repair costs less than about a third of a replacement, repair usually makes sense; if it is 15 years or older, uses discontinued R-22 refrigerant, or needs a major component like a compressor or heat exchanger, replacement usually wins. Every company on this list will quote both — ask for the repair price and a written replacement estimate before deciding.

How often should HVAC systems be serviced in St. Louis?

Twice a year is the standard recommendation — once in spring for cooling and once in fall for heating — and most manufacturers’ warranties require documented annual maintenance. That is why nearly every company on this list sells a maintenance plan. St. Louis summers put real load on air conditioners, so a spring tune-up before the first heat wave is the visit that matters most.

Spot an error in this list? Tell us and we’ll check it and fix it.

Last reviewed: Oct 2026.