HVAC companies in Denver, CO

What HVAC work costs in Denver

Ranges are general estimates gathered from homeowner-reported quotes in the Denver area, not an offer or a quote for your project.

When to schedule HVAC work in Denver

Denver's heating season is long, typically September through May, with overnight lows regularly dropping into the single digits and below-zero cold snaps most winters, so a working furnace or heat pump is not optional here. Summers bring a shorter but increasingly intense cooling season from June through early September, with more 90-plus degree days each year, and daily temperature swings of 25 to 30 degrees are common because of the dry, high-altitude climate. Many older Denver homes still rely on evaporative swamp coolers, which work well in low humidity but lose effectiveness during the brief monsoon-driven humid spells in July and August, which is part of why more homeowners are converting to refrigerated AC or heat pumps.

Permits and HOA rules

Denver requires a mechanical permit for furnace, AC, and heat pump replacement or new installation, filed through the city's Building Permits and Land Use online portal managed by Denver Community Planning and Development 1. Most straightforward equipment change-outs can be filed as an over-the-counter or online mechanical permit without a full plan review, but the job still needs a final inspection before it is considered closed. Homeowners just outside Denver city limits in Lakewood, Aurora, or unincorporated Jefferson County fall under a different jurisdiction's permitting office, so confirm which building department covers your address before assuming Denver's rules apply.

Licensing and insurance in Colorado

Colorado has no statewide HVAC contractor license, so licensing is set city by city and county by county, and Denver requires HVAC contractors to hold a Denver mechanical contractor license issued by Community Planning and Development before pulling permits inside city limits 2. Before hiring, ask for the contractor's Denver license number and confirm it is active through the city's contractor license lookup, and separately verify the company carries current general liability insurance and, ideally, is bonded 3. Never let a contractor start work under a license issued for a different city, since a Lakewood or Aurora license does not automatically authorize work inside Denver.

What local homes and systems are up against

Denver sits at 5,280 feet, and the thinner air at altitude changes how HVAC equipment performs: furnaces and AC condensers rated for sea-level conditions often need to be derated or upsized by a licensed technician who understands altitude correction, because manufacturer capacity ratings assume standard atmospheric pressure. A contractor who quotes equipment sizing without mentioning altitude derating is skipping a step that matters a lot in the Denver metro.

Many older homes in Wash Park, Park Hill, and Capitol Hill were built with evaporative swamp coolers rather than central AC, since Denver's historically dry summers made evaporative cooling effective and cheap to run. As summers get hotter and more humid spells creep in during the monsoon season, more homeowners are converting to refrigerated AC or ducted heat pumps, which usually requires new ductwork, a dedicated electrical circuit, and sometimes a new attic or roof penetration rather than a simple equipment swap.

Denver's Front Range hailstorms are a real and recurring risk to outdoor AC condensers: bent or perforated condenser fins from hail reduce airflow and efficiency, and severe hits can puncture the coil outright. Homeowners in Green Valley Ranch, Stapleton/Central Park, and other neighborhoods east of downtown, where hail tracks are common, should have condensers inspected after any significant hailstorm even if the unit still seems to run.

Because winters are long and cold, a working furnace or heat pump is treated as an emergency by most Denver contractors from roughly October through April, while summer AC failures spike in July and August when swamp coolers fall behind on the rare humid day.

How to vet and compare Denver HVAC contractors

Start by confirming the contractor's Denver mechanical contractor license number through the city's contractor license search, since Colorado has no statewide HVAC license and a license from another Front Range city does not carry over to Denver 3. Ask directly whether the company is bonded and carries current general liability insurance, and ask to see a certificate of insurance rather than taking their word for it.

Get at least two or three written estimates for any job over a couple thousand dollars, and make sure each bid lists the same details: equipment brand and model, altitude-adjusted capacity sizing, whether the job is a swamp cooler conversion or straight AC replacement, who is pulling the Denver mechanical permit, and warranty terms on both parts and labor. Our full breakdown of how to compare bids and screen companies is in the HVAC companies in Denver guide.

If you are trying to decide between repairing an aging furnace or AC system versus replacing it outright, our AC repair guide and HVAC replacement cost guide both walk through the repair-versus-replace math specific to Denver pricing and altitude.

Ready to get quotes instead of researching alone? Get matched with vetted HVAC pros near 80211 and skip the cold-calling.

What HVAC work costs here

Basic AC repairs, like a failed capacitor or contactor, generally run $160 to $420 in the Denver metro, while major failures such as a compressor or hail-damaged condenser coil can run $1,300 to $3,100. Furnace repairs, which see heavier demand given Denver's long heating season, typically run $200 to $1,600 depending on whether the fix is an igniter and blower motor or a cracked heat exchanger. See our HVAC repair cost guide by failure type for a fuller breakdown.

Full system replacements vary widely by equipment, altitude sizing, and whether ductwork already exists: a straightforward condenser-only swap runs roughly $4,900 to $8,600, while a full split system replacement including furnace and air handler can reach $7,200 to $13,500. Converting an older swamp cooler to central refrigerated AC, common in Wash Park and Park Hill bungalows, typically runs $5,500 to $12,000 once new ductwork and electrical work are included. Our HVAC replacement guide covers equipment options in more depth.

Xcel Energy offers electrification and heat pump rebates for Denver-area customers who install a qualifying ducted or ductless heat pump through a participating contractor, and the City of Denver also runs its own home electrification rebate programs that can stack with Xcel incentives for income-qualified households 4. Rebate amounts and eligibility change from year to year, so confirm current terms directly with Xcel Energy and the City of Denver before assuming a specific dollar figure applies to your project.

Permits and licensing before you sign

Any HVAC equipment replacement, new ductwork, or a swamp cooler to AC conversion inside Denver city limits needs a mechanical permit filed through Denver Community Planning and Development's online permitting system 1. Ask your contractor to confirm in writing that they will pull the permit and schedule the final inspection, rather than assuming it is included in the bid.

Verify the contractor's Denver mechanical contractor license and check that they carry current liability insurance and bonding before signing anything, since Colorado has no statewide HVAC license and licensing authority sits with individual cities and counties 2. If you live outside Denver's city limits, such as Lakewood or unincorporated Jefferson County, permitting and licensing authority sits with that municipality or county rather than the City and County of Denver, so confirm jurisdiction first.

A clear, itemized contract that states who pulls the permit, lists the exact equipment and altitude-adjusted capacity, and spells out warranty terms protects you if something needs service months or years later. Our guide on choosing an HVAC company in Denver covers red flags to watch for in a contract.

Common questions before you hire

Homeowners in Denver most often ask about furnace repair timing during cold snaps, whether it makes sense to convert a swamp cooler to refrigerated AC, and how to confirm a contractor is legitimately licensed to work inside city limits before letting them into the attic. The FAQ section below covers the most common questions, and the full city hub links out to our four detailed guides on repair costs, replacement pricing, failure-specific repair costs, and how to vet a company from start to finish.

If you are ready to move past research, get matched with vetted HVAC contractors near 80211 rather than searching cold.

Areas Henry covers

Wash Park · Highlands/LoHi · Park Hill · Stapleton/Central Park · Capitol Hill · Cherry Creek · Green Valley Ranch · Lakewood

Common questions

Denver guides from The Henry Files

Nearby Colorado markets