✓ Verified Google reviews·✓ Reviewed regularly·✓ Updated June 6, 2026
Written by Mark Reid,
Home Services Editor ·Verified June 6, 2026
St. Louis throws a lot at its HVAC systems. Summers regularly push past 90°F with brutal humidity rolling in off the Mississippi, while winters bring stretches of single-digit cold that stress furnaces hard. Most of the housing stock in neighborhoods like Soulard, Tower Grove, and Webster Groves was built before 1970, which means a lot of older ductwork, aging gas furnaces, and homes that weren't designed with modern air conditioning in mind. Newer construction out in Chesterfield or O'Fallon tends to run two-zone setups and high-efficiency heat pumps, but much of South St. Louis is still running single-zone forced-air systems tied to a basement gas furnace and a rooftop or split-system AC unit. Add in the city's clay-heavy soil, which can shift foundations and stress refrigerant lines running to exterior condensers, and you've got a market where local experience genuinely matters. A contractor who's spent years working on 1950s brick ranches in Affton or older two-flats in Benton Park knows things a generalist won't.
Every business on this page was drawn from third-party public business listings and ranked using public review ratings and review counts, with a small lift applied to businesses that show a working website and a reachable phone number. Before anything appeared here, we checked each business's homepage to confirm that HVAC work is what they primarily do. That step keeps general handymen, plumbing-only shops, and unrelated trades off the list. Any listing flagged as permanently closed is removed automatically. A handful of businesses may carry a Trust Verified badge. That badge means the business has gone through our full verification process, which covers trade qualifications and accreditations, public liability insurance, trading history, customer review history, and registered company information. You can see exactly what that involves on our How We Verify page. For any business that doesn't carry that badge, those checks haven't been done by us, and you'll want to do them yourself before booking.
Before you call anyone, pull together a few things that'll make conversations faster. Know your home's square footage and, if possible, the age and model of your current system. Ask any contractor you speak with for their Missouri HVAC license number, and verify it with the Missouri Division of Professional Registration before signing anything. For a new install, get at least two or three itemized quotes so you can compare equipment brands, SEER ratings, and labor costs directly. Ask specifically whether the quote includes permit fees, since St. Louis City and St. Louis County both require permits for new equipment installs, and pulling the permit is the contractor's legal responsibility. If you're getting a new furnace or air handler, ask whether the existing ductwork will be inspected and sealed as part of the job. It often isn't included by default, and leaky ducts in a 1960s ranch can kill efficiency fast.
How We Select & Rate The Best HVAC Contractors in St. Louis, MO
Rankings are driven by public review rating and review count pulled from third-party business listings, with a small lift for businesses that have a working website and phone number. We check each business's homepage to confirm HVAC contracting is what they primarily offer, which keeps unrelated trades off the page. Permanently closed listings are removed automatically. Businesses marked Trust Verified have additionally passed our full verification covering trade qualifications, insurance, trading history, customer review history, and registered company information. See our How We Verify page for the complete list. All other businesses on this page have not been independently verified by us, and inclusion is not an endorsement. Always carry out your own checks before hiring.
Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. Every other listing is ranked on rating and review count from third-party business listings. How we rank & verify →
Quick Comparison — HVAC Contractors in St. Louis, MO
Seliga Heating and Cooling serves residential and commercial customers across St. Louis, handling installation, repair, and maintenance for heating and cooling systems. A 5-star rating across more than 1,800 Google reviews reflects consistent work throughout the 63116 area and beyond. The company covers the full range of HVAC needs, from routine seasonal tune-ups to full system replacements.
Homeowners and businesses across St. Louis rely on Design Aire Heating & Cooling for heating and cooling installation, repair, and maintenance. The company holds a 5-star Google rating across more than 1,000 reviews, reflecting consistent work in the 63109 area and surrounding neighborhoods. Services cover residential and light commercial HVAC systems, with a focus on year-round climate control.
Homeowners and businesses across St. Louis rely on Dole Heating & Air Conditioning for heating and cooling installation, repair, and maintenance. Rated 4.9 stars across more than 1,200 Google reviews, the company has built a consistent record with residential and commercial clients in the 63104 area. Service covers the full range of HVAC systems, from central air to furnaces.
Specializing in heating and cooling repair, installation, and maintenance, St. Louis Heating and Air Conditioning serves residential customers in the 63139 area and surrounding neighborhoods. With a 4.9-star rating across more than 450 Google reviews, the company has built a consistent record of reliable service in a city where both harsh winters and humid summers put HVAC systems under serious strain.
Homeowners and small businesses across St. Louis turn to T-Will Fix It for heating and cooling work, and 173 Google reviewers have rated the company 4.9 out of 5. Based in the 63104 area, the contractor handles installation, repair, and maintenance without the overhead of a large franchise operation. That combination of neighborhood accessibility and consistent customer feedback sets it apart in a crowded local market.
St Louis Heating and Cooling is an HVAC contractor serving the St. Louis area from the 63110 district. The company handles installation, repair, and maintenance of heating and cooling systems for residential and commercial customers. With a 4.8-star Google rating across 17 reviews, it has built a consistent record of straightforward service in a city where seasonal temperature swings put real demand on home comfort equipment.
Rated 4.5 stars across 32 Google reviews, 1-Call Heating and Cooling, LLC serves the St. Louis area with residential and commercial HVAC work. The company handles installation, repair, and maintenance of heating and cooling systems. Its 63111 base positions it well for south city neighborhoods and surrounding zip codes.
Heating and cooling contractors serving St. Louis, Person HVAC, LLC handles residential and commercial HVAC installation, repair, and maintenance across the area. The company holds a 4.7-star Google rating across 13 reviews, a consistent mark for a local operation. Homeowners and businesses in the 63107 corridor can reach them through personhvac.com.
WKF Mechanical handles heating, cooling, and ventilation work for residential and commercial clients in St. Louis. Operating out of the 63104 area, the company covers system installation, replacement, and maintenance across the metro. Homeowners and building managers in the region use them for both scheduled service and urgent repairs.
Heating and cooling contractors serving St. Louis, Weis Comfort Systems handles residential and commercial HVAC installation, repair, and maintenance. With a 4.8-star rating across customer reviews, the company has built a consistent record in the area. Homeowners and businesses looking for reliable climate control work in the St. Louis metro have a locally rooted option worth considering.
Specializing in residential heating and cooling systems, Perkins Heating & Cooling Co. Inc. serves the St. Louis area with installation, repair, and maintenance work across a range of HVAC equipment. The company holds a 4.6 Google rating across its reviews. Homeowners looking for straightforward service without a large corporate intermediary will find this an independently operated option worth contacting.
Transparency notice: Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. All other listings are ranked by a combined score drawn from ratings and review counts published on third-party business listings, plus basic completeness signals such as a working website and phone. A Trust Verified badge means we have independently checked that business's documents; businesses without it have not been independently verified by us. How we verify →
Is your business missing?
Get listed and reach customers actively searching for your services in this area.
It depends heavily on what you need. A straightforward furnace tune-up or seasonal AC service call typically runs $80 to $150. Refrigerant recharges add cost depending on the refrigerant type, R-410A work often adds $150 to $300 on top of the service fee. Replacing a gas furnace in a typical St. Louis home (1,200 to 1,800 square feet) runs roughly $2,500 to $5,500 installed, depending on efficiency rating and brand. A central air conditioner replacement for a similar-sized home usually falls between $3,000 and $6,500 installed. Full system replacements, furnace plus AC, commonly run $6,000 to $12,000 or more depending on system size and whether ductwork needs work. Getting two or three quotes is normal and worth doing, since labor rates and equipment markup vary across the metro.
Do HVAC contractors in St. Louis need to be licensed?
Yes. Missouri requires HVAC contractors to hold a state-issued mechanical contractor license for most installation and replacement work. You can verify a contractor's license number through the Missouri Division of Professional Registration online. St. Louis City and St. Louis County also require permits for new equipment installs, and the contractor is responsible for pulling those permits. If a contractor asks you to pull the permit yourself or suggests skipping it altogether, that's a red flag. Always ask for the license number before signing a contract and check it yourself.
What's the right time of year to replace an HVAC system in St. Louis?
Spring and fall are the practical sweet spots. Contractors are less slammed than they are in July when every AC in South City seems to fail at once, or in January during a cold snap. Scheduling a replacement in April or October gives you more scheduling flexibility, sometimes better pricing, and the comfort of knowing the new system is installed and tested before extreme weather arrives. That said, if your furnace dies in February or your AC fails in August, you don't have the luxury of waiting. Most reputable St. Louis HVAC companies offer emergency service, though expect to pay a premium for off-hours calls.
How long do furnaces and air conditioners typically last in St. Louis?
A gas furnace that's been serviced regularly will often run 18 to 22 years in St. Louis conditions. Central AC units tend to have a shorter lifespan, usually 14 to 18 years, partly because of how hard they work during Missouri summers. Heat pumps fall somewhere in between. If your system is more than 15 years old, it's worth getting an efficiency assessment before dumping money into a repair. A $1,200 compressor replacement on a 17-year-old unit that's already running at 30 percent below rated efficiency rarely makes financial sense compared to putting that money toward a new system with a manufacturer warranty.
Is a heat pump a good option for St. Louis homes?
Heat pumps have gotten significantly more capable in recent years and they work well in St. Louis for much of the heating season. The city's winters do get cold enough that standard heat pumps struggle below about 20 to 25°F, so most St. Louis installations pair a heat pump with a gas furnace backup in a dual-fuel setup. That combination gives you efficient electric heating through the mild shoulder seasons and reliable gas backup when temperatures really drop. For older homes in University City or South St. Louis with existing gas infrastructure, dual-fuel tends to be the more practical choice than going all-electric. Ask any contractor quoting a heat pump whether they're recommending a cold-climate rated model and what backup heat setup they're including.
How do you choose between HVAC contractors in St. Louis?
Start by verifying the basics yourself. Check that the contractor holds a current Missouri mechanical contractor license through the Missouri Division of Professional Registration. Ask for proof of general liability insurance and confirm it's current. Look at their public reviews across multiple platforms, not just whatever's on their own website. When you get quotes, ask for itemized breakdowns that separate equipment costs, labor, and permit fees. A contractor who can't or won't itemize a quote is one to be cautious about. Ask which brands they're authorized to install and service, since some manufacturers require factory authorization for warranty-covered work. Finally, ask directly whether they'll pull the necessary permits. A contractor who skips permits is leaving you exposed to inspection issues and potential insurance complications down the line.
Related Guides
More independently researched rankings you might find useful
