Find a 24/7 HVAC Technician in Denver, CO
When cold winters and warm summers both lean on your HVAC and it quits, you need help fast. Connect with an independent local HVAC pro — our phone line is open 24/7.
By Gyanesh Gulshan — Founder, Cool Call Pro
HVAC emergencies in Denver
Call Now — (844) 582-179524/7 call line · call to check availability in Denver
Furnace not igniting or blowing cold
Furnace won't ignite · blowing cold air · short-cycling · burning smell on first startup. In Denver cold snaps, call right away if freezing weather is forecast — a home without heat risks frozen pipes. If you smell gas, leave the building right away without flipping switches or using phones inside, then call 911 or your gas utility’s emergency line from outside.
AC out, blowing warm, or iced over
Outdoor unit silent · indoor blower running but warm air · ice on the refrigerant lines · short-cycling on/off. Possible causes range from electrical parts (capacitor, contactor) to a refrigerant problem — both need a technician to diagnose.
Banging, screaming, or grinding outdoor unit
Loud bangs · metal-on-metal screaming · grinding or rattling from the outdoor unit. Possible causes include a failing fan motor, a loose blower wheel, or worn compressor bearings. Turn the system off at the thermostat and call a technician.
How Cool Call Pro works in Denver
24/7 Denver call line
Our phone line is open 24/7. Calls are routed to independent HVAC providers in the Denver area where one is available; hours, weekend and holiday coverage, and overnight surcharges are set by each provider.
Call to check availability
Provider availability varies by address and time of day, so call to check availability in Denver. The neighborhoods and ZIPs listed for this page are in the Services & service area section below.
Check licenses yourself
Cool Call Pro does not check contractor licenses or insurance. Licensing is set locally in Colorado — check with your city or county before you hire. Colorado rules are in the local data section below.
Denver's high-altitude climate & your HVAC
The Zone 5B (Cold-Dry) climate combines cold winters with summer cooling needs. Federal SEER2 13.4 (North Region) minimum applies to new AC equipment.
Avg summer high
IECC zone (high-altitude)
Avg winter low
Federal SEER2 minimum
Days/yr above 90°F
Days/yr below 32°F
Denver had an estimated 740,613 residents on July 1, 2025. In Denver, the median home was built in 1974 with a current median value of $586,700. Around 49% of homes are owner-occupied. About 62% of households heat with natural gas vs. 35% electric. The Colorado grid averages $0.17/kWh. Sources: U.S. Census population estimates · U.S. Census ACS 2019–2023 5-year tables B25035 · B25077 · B25003 · B25040 · U.S. EIA state rates.
Read our guide on preparing for winter storms.
HVAC in Denver, CO: local data & sources
Every numerical claim below references a federal, state, or municipal primary source — NOAA climate normals, U.S. Census ACS, the Colorado licensing authority, and your local utility's published rebate program.
NOAA NCEI 1991–2020 Normals
Denver International Airport (KDEN) is the NOAA reference station for the city. Per the NOAA NCEI U.S. Climate Normals 1991–2020 (station USW00003017), Denver records an annual mean temperature of 51.2°F, approximately 5,862 annual heating degree days against 849.5 cooling degree days, and 14.48 inches of annual precipitation. The 6.9:1 HDD-to-CDD ratio makes Denver a strongly heating-dominated market — and because Denver sits at 5,280 ft elevation, every HVAC specification decision must also account for altitude derating: air-source heat pumps and combustion furnaces deliver reduced output in Denver’s thin air compared to their sea-level rated capacity.
U.S. Census ACS 2023 5-Year
The U.S. Census Bureau ACS 2023 5-year estimates (Tables B25040 and B25035 for Denver city, Colorado) report 329,578 occupied housing units with a median year built of 1974. Heating-fuel distribution: 61.5% utility natural gas (202,820 units), 35.0% electricity (115,277 units), 4,488 bottled/LP gas homes, and 1,427 solar-heated homes. The combination of a 5,862 HDD climate and 1970s-era housing stock means most Denver homes rely on gas forced-air furnaces — which creates a large addressable market for gas-to-electric heat-pump conversions, where utility rebates may help offset the cost; check Xcel Energy’s current offers.
City of Denver Planning & Development
Colorado does not issue a statewide HVAC contractor license. Instead, Denver handles HVAC contractor licensing at the municipal level through Denver Community Planning and Development’s Contractor Licensing division. Per the CPD licensing page: “A supervisor certificate — or employing someone who holds a supervisor certificate — is required before obtaining a contractor’s license,” and “licenses and certificates must be renewed every 1–3 years, depending on your license type.” Verifying a contractor’s active Denver CPD license before authorizing work is the critical due-diligence step for Denver homeowners — more so than in states with a statewide board, because the municipal license is the only formal credential. Permit fees for residential mechanical work are set by CPD and can be confirmed by contacting the department at (720) 865-2780. For current Xcel Energy Colorado rebate dollar amounts, see the utility’s residential rebates page or the ENERGY STAR Rebate Finder with a Denver ZIP. The federal Section 25C tax credit was terminated for installations after Dec 31, 2025 (OBBBA, P.L. 119-21).
Xcel Energy, DSIRE, Denver Community Planning and Development (CPD)
Denver homeowners served by Xcel Energy may qualify for savings through Xcel Energy Whole Home Efficiency Program when installing qualifying high-efficiency equipment. Check your state energy office and utility for current rebate programs — the federal Section 25C tax credit was terminated for installations placed in service after Dec 31, 2025 (P.L. 119-21). Primary source: DSIRE — Colorado.
The federal Section 25C Energy Efficient Home Improvement Credit was terminated for installations placed in service after Dec 31, 2025 by the One Big Beautiful Bill Act (Public Law 119-21). Check your state energy office and utility for current rebate programs. See our HVAC financing options for what's still available.
Services & service area
Services you can ask about
- High-Altitude Furnace Installation in Denver
- Emergency HVAC Repair in Denver
- Central Air Conditioning Installation & Replacement
- Heat Pump Systems for Mountain Climates
- Ductwork Inspection & High-Altitude Combustion Testing
Neighborhoods & ZIPs listed for Denver
- Washington Park
- Cherry Creek
- Hilltop
- Congress Park
- Park Hill
- ZIP codes: 80209, 80206, 80220, 80210, 80218
HVAC repair costs: national ranges for Denver, CO homeowners
Cool Call Pro editorial estimates of typical U.S. prices from our 2026 cost guide — not quotes and not Denver-specific. Actual price varies by provider and complexity.
Diagnostic / service call
$65–$150
Some providers credit it toward the repair — ask when you call
Minor AC repair
$75–$500
Capacitor, contactor, thermostat, drain line
Refrigerant recharge
$150–$600
R-410A per recharge; leak fix extra
After-hours surcharge
$100–$300
Added to repair cost on emergency calls
See full repair, install, and replacement ranges in our 2026 HVAC Cost Guide and how we build these ranges →
Ready to talk to an HVAC pro in Denver?
Independent technicians · 24/7 call line · Licensing is set locally in Colorado — check with your city or county before you hire
Call Now — (844) 582-1795Disclosure: We are a referral service and may receive compensation for qualified calls. Calls may be routed to an independent provider network and may be recorded. Pricing and availability vary by provider and location.
This page also covers these cities
Homeowners in the cities below can use the same number as Denver. Call to check provider availability for your address.
Neighborhoods, ZIPs & permits
Neighborhoods: Tallyn's Reach, Saddle Rock, Southshore, Mission Viejo, Heather Gardens. ZIP codes listed: 80015, 80016, 80013, 80014, 80017. Local permits through City of Aurora Building Division.
Neighborhoods, ZIPs & permits
Neighborhoods: North Boulder, University Hill, Table Mesa, Whittier, Martin Acres. ZIP codes listed: 80302, 80304, 80305, 80303, 80301. Local permits through City of Boulder Planning & Development Services.
Frequently Asked Questions — Denver, CO
Yes, ensure your contractor files a mechanical permit with the Denver Community Planning and Development (CPD). Pulling the correct permits protects you as a homeowner and ensures work is inspected to code.
Rebate programs for Denver homeowners are summarized, with sources, in the Local Rebates & Permits card above. Confirm current amounts and eligibility with your utility (Xcel Energy) before scheduling work. The federal Section 25C credit was terminated for installations placed in service after Dec 31, 2025 (One Big Beautiful Bill Act, P.L. 119-21); check your state energy office and utility rebate programs instead.
The neighborhoods and ZIP codes listed for Denver are in the ZIPs & Neighborhoods card above. Provider availability varies by address, so call (844) 582-1795 to check availability in Denver.
Cool Call Pro’s editorial estimate for a standard AC replacement in Denver is $4,000–$8,000, and for furnace installations $3,500–$7,500. These are our own estimates, not quotes or survey data — see how we build cost ranges. Costs vary with system size, efficiency rating, and installation complexity. In Colorado, new AC units must meet a minimum SEER2 13.4 (North Region) rating.
Colorado does not require a statewide HVAC contractor license. Always verify your contractor’s credentials before authorizing work. For Denver residents, permits are filed through the Denver Community Planning and Development (CPD).