No heat or no cooling right now?
If you smell gas or a carbon monoxide alarm sounds, leave first and call 911 or your gas utility from outside. Otherwise, call a company below that says it takes emergency calls. Quick checks first: AC not cooling · furnace not working.
The list
Denver HVAC companies, A to Z
Filter by what each business says on its own website. “Says 24/7 emergency” means its site says so – call to confirm before you rely on it.
Your HVAC company, Denver
The one City Spotlight place for Denver sits here, above the A to Z list. Requests sent from this page for areas the Spotlight company serves go to it. Offered only to companies that pass our listing rules. How it works
303 Heating & Air, Inc
Based in Parker, CO · 17011 Lincoln Ave. Suite 110, Parker, CO 80134
Names on its website: Highlands Ranch, Aurora, Castle Rock, Lone Tree, Centennial, Littleton, Lakewood, Arvada, Englewood, Castle Pines and more
All Climate Systems Heating and Cooling
Based in Thornton, CO · 12295 Pennsylvania St. #2B, Thornton, CO 80241
Names on its website: Brighton, Broomfield, Federal Heights, Northglenn, Westminster, Arvada, Commerce City, Erie, Boulder, Lafayette and more
License number shown on its website: ME202401219
Apple Aire Heating & Cooling
Based in Wheat Ridge, CO · 4020 Youngfield St, Wheat Ridge, CO 80033
Names on its website: Applewood, Arvada, Aurora, Boulder, Brighton, Broomfield, Centennial, Denver, Englewood, Golden and more
License number shown on its website: License #: 12182.1
Aspen Creek Heating & Air
Based in Lafayette, CO · 12636 Flagg Dr, Lafayette, CO 80026
Names on its website: Broomfield, Westminster, Arvada, Denver, Boulder, Erie, Louisville, Superior, Thornton
B&B Heating & Air Conditioning, Inc.
Based in Wheat Ridge, CO · 4892 Marshall St, Wheat Ridge, CO 80033
Names on its website: Arvada, Broomfield, Littleton, Englewood, Greenwood Village, Lone Tree, Lakewood
Better Built Heating, Cooling, and Plumbing
Based in Parker, CO · 10315 S. Progress Way, Unit #4, Parker, CO 80134
Names on its website: Aurora, Castle Pines, Castle Rock, Centennial, Denver, Franktown, Highlands Ranch, Lone Tree
License number shown on its website: Licensed
Colorado Custom Service
Based in Westminster, CO · 7895 Bradburn Blvd, Westminster, CO 80030
Names on its website: Golden, Arvada, Denver, Broomfield, Commerce City, Lakewood, Aurora, Thornton, Northglenn, Littleton and more
License number shown on its website: Licensed and insured
Colorado Eco-Mechanical
Based in Westminster, CO · 6510 W 91st Ave Ste 108, Westminster, CO 80031
Names on its website: Boulder, Superior, Longmont, Erie, Louisville, Lafayette, Denver, Arvada, Thornton, Littleton and more
D&A Heating and Air, LLC
Based in Lakewood, CO · 1073 S Holland St, Lakewood, CO 80226
Names on its website: Denver, Parker, Aurora, Castle Rock, Centennial
DALCO Heating & Air Conditioning
Based in Denver, CO · 4610 S. Ulster St., #150, Denver, CO 80237
Names on its website: Highlands Ranch, Castle Rock, Golden, Lakewood
Eastside Heating & Air Conditioning, Inc.
Based in Brighton, CO · 10381 E 106th Ave, Brighton, CO 80601
Names on its website: Northglenn, Broomfield, Commerce City, Stapleton, Derby, Welby, Todd Creek, Fort Lupton, Dacono, Firestone
License number shown on its website: EPA licensed
Efficient Comfort
Based in Westminster, CO · 10835 N Dover St. #100, Westminster, CO 80021
Names on its website: Arvada, Broomfield, Boulder, Denver, Edgewater, Erie, Golden, Lafayette, Lakewood, Louisville and more
Gustafson Heating & Air Conditioning
Based in Englewood, CO · 2585 S. Raritan Street, Englewood, CO 80110
Names on its website: Littleton, Highlands Ranch, Centennial, Wheat Ridge, Arvada
Kappler Mechanical & Electrical, Inc.
Based in Broomfield, CO · 7270 W. 118th Pl., Unit A, Broomfield, CO 80020
Names on its website: Boulder, Westminster, Louisville, Lafayette, Erie, Thornton, Arvada, Superior, Longmont
Lakeside Heating & Air Conditioning
Based in Arvada, CO · 6260 West 52nd Ave Unit 116, Arvada, CO 80002
Names on its website: Broomfield, Centennial, Denver, Edgewater, Englewood, Golden, Highlands Ranch, Lakewood, Littleton, Northglenn and more
License number shown on its website: Licensed & Insured
Mike's Heating LLC
Based in Golden, CO
Names on its website: Denver
License number shown on its website: Technicians hold Master Licenses through the City of Denver for Heating Ventilation & Air Conditioning, Steam & Hot Water, and Refrigeration
Moore Heating & A/C, Inc.
Based in Parker, CO · 10212 Progress Ln, Parker, CO 80134
Names on its website: Aurora, Castle Rock, Centennial, Denver, Englewood, Highlands Ranch, Lone Tree
Mr. Cool Heating and Cooling
Based in Arvada, CO · 6318 W 71st Ave., Arvada, CO 80003
Names on its website: Aurora, Denver, Centennial
Northglenn Heating & Air Conditioning, Inc.
Based in Northglenn, CO · 10977 Irma Dr., Northglenn, CO 80233
Names on its website: Arvada, Aurora, Boulder, Brighton, Broomfield, Centennial, Denver, Englewood, Greenwood Village, Lafayette and more
License number shown on its website: License # 3092
Quality West Heating & Cooling
Based in Denver, CO · 1154 S Lipan St, Denver, CO 80223
Names on its website: Littleton, Centennial, Lakewood, Highlands Ranch, Lone Tree, Ken Caryl
License number shown on its website: H&VA LIC00247869 / PC.0004256 / MP.00180161
ROX Heating & Air
Based in Littleton, CO · 1745 Shea Center Dr, 4th Floor, Littleton, CO 80129
Names on its website: Arvada, Aurora, Castle Pines, Centennial, Cherry Creek, Denver, Englewood, Golden, Greenwood Village, Highlands Ranch and more
Summit Heating, A/C, Plumbing & Electrical
Based in Littleton, CO · 8091 Shaffer Pkwy, Suite C, Littleton, CO 80127
Names on its website: Arvada, Aurora, Broomfield, Castle Rock, Centennial, Highlands Ranch, Lakewood, Parker
Tempcontrol Heating & Air Conditioning
Based in Littleton, CO · 5943 West Alder Avenue, Littleton, CO 80128
Names on its website: Glendale, Englewood, Morrison, Greenwood Village, Columbine, Ken Caryl, Centennial, Highlands Ranch, Lone Tree, Parker and more
The Weather Changers Heating & Air Conditioning
Based in Denver, CO · 10525 E 40th Ave. STE 203, Denver, CO 80239
Names on its website: Aurora, Centennial, Englewood, Parker, Lakewood, Arvada, Thornton
Tradewinds Heating & Cooling Inc.
Based in Wheat Ridge, CO · 4935 Independence St, Wheat Ridge, CO 80033
Names on its website: Applewood, Arvada, Aurora, Boulder, Broomfield, Denver, Edgewater, Englewood, Golden, Lakewood and more
Unique Heating & Air Conditioning Inc.
Based in Northglenn, CO · 10783 Irma Dr., Northglenn, CO 80233
Names on its website: Denver Metro, Arvada, Wheat Ridge
Van Genderen Heating & Air Conditioning
Based in Centennial, CO · 9940 East Costilla Ave. Ste. R, Centennial, CO 80112
Names on its website: Aurora, Denver, Englewood, Littleton, Parker, Lakewood, Castle Pines, Highlands Ranch, Lone Tree, Castle Rock and more
License number shown on its website: fully licensed and insured
Walrath HVAC
Based in Lakewood, CO · 7935 W. 14th Ave., Lakewood, CO 80214
Names on its website: Denver Metro, Arvada, Littleton, Centennial, Castle Rock
Details on this page come from each business’s own website, checked October 2026. Free listings are shown alphabetically. How we list · Update or remove a listing
Before you hire
Checking an HVAC company in the Denver area
HVAC licenses in Colorado
There is no statewide HVAC contractor license that we could find; cities or counties license HVAC work.
Local rules: The state Division of Professions and Occupations lists plumbing and electrical programs but no HVAC or mechanical contractor program, so HVAC licensing is by city or county; Denver, for example, issues Heating and Ventilating Class A, Class B (residential only) and Heating, Ventilating, A/C (residential only) supervisor certificates, and we could not confirm a Denver contractor lookup page or the rules of other Colorado cities.
Ask the contractor for the license or supervisor certificate issued by your city or county building department and confirm it with that department, and check that a permit is pulled.
Federal rule: in every state, technicians who handle refrigerant must hold EPA Section 608 certification, whatever the state or city requires.
We could not confirm every detail from Colorado’s own sources, so treat this as a starting point and check with the agency.
Sources: dpo.colorado.gov, dpo.colorado.gov, denvergov.org, denvergov.org. Checked October 2026 from official sources. This is not legal advice.
Questions to ask
Ask every company the same questions: license number, insurance, EPA refrigerant certification, a written itemized estimate, a load calculation for new equipment, after-hours rates, who pulls the permit, and the warranty. All eight questions.
Seasonal care
Getting through a Denver winter
Heating season is the long one in Denver, so the furnace, boiler or heat pump does most of the work. Start with these before the first cold snap – and keep carbon monoxide alarms working.
Questions
Denver HVAC questions
How many HVAC companies are listed in Denver?
28 HVAC companies, each based within about 25 miles of Denver. They are listed alphabetically.
Which Denver HVAC companies say they offer 24/7 emergency service?
15 of the businesses listed here say on their own website that they offer 24/7 or 24-hour emergency service: All Climate Systems Heating and Cooling, Apple Aire Heating & Cooling, B&B Heating & Air Conditioning, Inc., Better Built Heating, Cooling, and Plumbing, Colorado Custom Service, D&A Heating and Air, LLC, Eastside Heating & Air Conditioning, Inc., Lakeside Heating & Air Conditioning, Moore Heating & A/C, Inc., Northglenn Heating & Air Conditioning, Inc., Summit Heating, A/C, Plumbing & Electrical, Tempcontrol Heating & Air Conditioning and others. Call to confirm availability and after-hours rates.
Do HVAC contractors in Denver need a license?
In Colorado, HVAC work is licensed by cities or counties rather than the state – ask the local building department.
Which Denver companies work on heat pumps?
24 of the listed businesses say on their own website that they install or repair heat pumps. Use the Heat pumps filter above the list.
Which HVAC companies here do commercial work?
18 of the listed businesses say on their own website that they work on commercial properties. Use the Commercial filter above the list.
Do technicians need EPA certification?
Yes: federal rules require technicians who handle refrigerant to hold EPA Section 608 certification, in every state. Ask any company you are considering.
Nearby metro areas: Phoenix, AZ · Oklahoma City, OK · Salt Lake City, UT · Cheyenne, WY · Omaha, NE · Albuquerque, NM · Tucson, AZ · Colorado Springs, CO. All of Colorado.
Request an HVAC company
Ask us to find an HVAC company in Denver
Tell us the job and your ZIP code. We pass your request to listed companies that serve your area, and they contact you directly.
No heat in freezing weather, or no cooling in dangerous heat? Call a company from the list that says it takes emergency calls – a form is not fast enough. If you smell gas or a carbon monoxide alarm sounds, leave first and call 911 or your gas utility from outside.