Key takeaways
- Typical cost in Boulder: $7,000–$12,000 (for a combined AC and furnace replacement); national range $7,000–$12,000.
- Biggest local factors: wildfire, long heating season and hard water.
- How long it takes: Most AC or furnace swaps take one day.
- Permits: Replacing an AC, heat pump or furnace usually needs a mechanical permit, and the installer normally pulls it.
- Best timing: Book furnace or heat pump service in early fall, before the first hard freeze.
- Before you hire: get at least three written, itemized quotes from licensed, insured Colorado contractors.
How much does HVAC repair and replacement cost in Boulder, CO?
Replacing a central AC and furnace together typically costs $7,000–$12,000 installed. An AC alone runs about $2,500–$9,000 and a furnace $2,000–$6,900, depending on size, efficiency and brand. Most single repairs cost $250–$700. Colorado prices run at the U.S. average, so a typical Boulder job lands around $7,000–$12,000. Local labor rates, permit fees and your home's specifics move the final number.
| Job | Typical cost | Notes |
|---|---|---|
| AC + furnace replacement | $7,000–$12,000 | Average-size home, standard efficiency |
| Central AC replacement | $2,500–$9,000 | Higher-SEER2 units cost more up front |
| Furnace replacement | $2,000–$6,900 | 90%+ AFUE models run $3,300–$6,900 |
| Heat pump system | $5,000–$18,000+ | High-efficiency and multi-zone at the top end |
| Average AC repair | $250–$700 | National average about $375 |
| Capacitor replacement | $100–$400 | One of the most common summer repairs |
| Refrigerant leak repair | $200–$1,500 | Recharge alone $100–$600 after the leak is fixed |
Boulder is big enough to have a solid pool of local contractors, and many regional companies also serve the area, so getting three quotes is easy.
HVAC cost questions for Boulder, CO
- What is the cost of AC + furnace replacement in Boulder, CO? The typical cost of AC + furnace replacement in Boulder, CO is $7,000–$12,000. Average-size home, standard efficiency.
- What is the cost of central AC replacement in Boulder, CO? The typical cost of central AC replacement in Boulder, CO is $2,500–$9,000. Higher-SEER2 units cost more up front.
- What is the cost of furnace replacement in Boulder, CO? The typical cost of furnace replacement in Boulder, CO is $2,000–$6,900. 90%+ AFUE models run $3,300–$6,900.
- What is the cost of heat pump system in Boulder, CO? The typical cost of heat pump system in Boulder, CO is $5,000–$18,000+. High-efficiency and multi-zone at the top end.
- What is the cost of average AC repair in Boulder, CO? The typical cost of average AC repair in Boulder, CO is $250–$700. National average about $375.
- What is the cost of capacitor replacement in Boulder, CO? The typical cost of capacitor replacement in Boulder, CO is $100–$400. One of the most common summer repairs.
- What is the cost of refrigerant leak repair in Boulder, CO? The typical cost of refrigerant leak repair in Boulder, CO is $200–$1,500. Recharge alone $100–$600 after the leak is fixed.
- What is the cost of compressor replacement in Boulder, CO? The typical cost of compressor replacement in Boulder, CO is $600–$3,000. Often triggers a replace-the-system decision.
- What is the cost of evaporator coil replacement in Boulder, CO? The typical cost of evaporator coil replacement in Boulder, CO is $400–$2,700. Coil leaks are common on older systems.
- What is the cost of blower motor replacement in Boulder, CO? The typical cost of blower motor replacement in Boulder, CO is $300–$2,000. Variable-speed motors cost more.
- What is the cost of thermostat replacement in Boulder, CO? The typical cost of thermostat replacement in Boulder, CO is $150–$500. Smart thermostats at the higher end.
What affects HVAC repair and replacement in Boulder
Boulder has cold, snowy winters and warm summers. Book furnace or heat pump service in early fall, before the first hard freeze.
Signs your HVAC system needs repair
- Warm air from vents or the system can't reach the thermostat setting
- Short cycling — turning on and off every few minutes
- Ice on the refrigerant lines or outdoor unit
- Grinding, squealing, banging or buzzing noises
- Water pooling around the indoor unit
- A sudden jump in energy bills
- Burning or musty smells from vents
One symptom doesn't always mean a big repair. A clogged filter or tripped breaker causes many no-cooling calls, so check those first.
Common questions about HVAC repair and replacement in Boulder
How much does a new AC unit cost for a 2,000 sq ft house in Boulder, CO?
Most 2,000 sq ft homes need a 3–4 ton system. A central AC replacement alone typically runs $2,500–$9,000 nationally, and replacing both the AC and furnace costs about $7,000–$12,000 in Boulder, CO.
Is it worth repairing a 15-year-old AC?
Usually not. Use the $5,000 rule: multiply the unit's age by the repair cost. If the result is over $5,000, replacing is usually the better value. A $400 repair on a 15-year-old unit scores $6,000.
How long does an HVAC system last in Boulder, CO?
Furnaces typically last 15–20 years, and central air conditioners and heat pumps 10–15 years. Long cooling seasons and skipped maintenance shorten those lives.
What size AC do I need for my house?
A rough rule is one ton of cooling per 500–600 square feet, but insulation, windows, climate and ductwork change that. Ask for a Manual J load calculation instead of a square-footage guess.
Should I replace my AC and furnace at the same time?
Often yes when both are over 12–15 years old. A matched system runs more efficiently, and you pay for one installation visit and one permit instead of two.
Why is my AC running but not cooling?
The usual causes are a clogged filter, a frozen evaporator coil, a tripped outdoor unit, a failed capacitor or low refrigerant from a leak. Replace the filter and check the breaker first; if that doesn't fix it, call a technician.
How much does an AC tune-up cost?
A tune-up typically costs about $75–$200 per visit. Many companies offer maintenance plans that bundle a spring AC and fall furnace check.
Are there rebates for a new heat pump in Boulder, CO?
Federal energy tax credits changed in 2025, so check current IRS guidance. Utilities and some states still offer rebates for high-efficiency heat pumps, so ask installers which programs apply in Boulder, CO.
Timeline, permits and DIY in Boulder
How long it takes
Most AC or furnace swaps take one day. A full system with new ductwork takes 2–5 days.
Permits
Replacing an AC, heat pump or furnace usually needs a mechanical permit, and the installer normally pulls it. Check with the Boulder building department for local rules.
DIY or hire a pro?
Filters, clearing debris from the outdoor unit and flushing the condensate line are safe DIY jobs. Refrigerant, gas and electrical work need a licensed technician.
Questions to ask Boulder contractors
Ask every bidder the same questions so you can compare quotes apples to apples.
- Will you do a Manual J load calculation instead of sizing by square footage?
- What SEER2, HSPF2 or AFUE rating is quoted, and does it qualify for rebates or tax credits?
- Are the permit, haul-away and thermostat included?
- What is the labor warranty, separate from the parts warranty?
Maintenance that prevents costly repairs
- Replace filters every 1–3 months
- Book a tune-up before each cooling and heating season
- Keep 2 feet of clearance around the outdoor unit
How to hire for HVAC repair and replacement in Boulder
- Confirm the contractor is licensed for HVAC work in Colorado and insured.
- Ask for a Manual J load calculation instead of a size-by-square-feet guess.
- Get three written quotes listing exact equipment model numbers and SEER2/AFUE ratings.
- Compare labor warranties, not just manufacturer warranties.
- Make sure the quote includes permits, haul-away and thermostat setup.
HVAC in Boulder: FAQs
How much does HVAC replacement cost in Boulder, CO?
Most Boulder homeowners can plan on $7,000–$12,000 to replace a central AC and furnace together, or about $2,500–$9,000 for an AC alone. Local labor rates, ductwork and permits in Boulder move the final price.
When is the best time to replace an HVAC system in Boulder?
Spring and fall are the slow seasons for HVAC contractors in Boulder, so you'll usually get faster scheduling and better pricing than during a summer heat wave or winter cold snap.
Is a heat pump a good idea in Boulder?
It can be. Boulder has a long heating season, so look at cold-climate heat pumps or a dual-fuel setup that pairs a heat pump with a gas furnace for the coldest days.
Do I need a permit to replace my AC in Boulder?
Most cities, including Boulder, require a mechanical permit for equipment replacement. A licensed contractor normally pulls it and schedules the inspection.
How much does HVAC repair and replacement cost in Boulder compared to the national average?
With Colorado's regional cost index of 1.00, expect roughly $7,000–$12,000 in Boulder, versus $7,000–$12,000 nationally.
How long does HVAC repair and replacement take in Boulder?
Most AC or furnace swaps take one day. A full system with new ductwork takes 2–5 days. Permit and inspection scheduling in Boulder can add a few days.
Do I need a permit for HVAC repair and replacement in Boulder?
Replacing an AC, heat pump or furnace usually needs a mechanical permit, and the installer normally pulls it. Confirm with the Boulder or county building department.
Which Boulder ZIP codes does this guide cover?
This guide applies to Boulder ZIP codes 80301, 80302, 80303, 80304, 80305, 80306, 80307, 80308, 80309, 80310, 80314, 80321, 80322, 80323, 80328, 80329, 80455, plus the surrounding area.
How long does an HVAC system last?
Central AC units usually last 12–15 years, heat pumps 10–15 years and gas furnaces 15–20 years. Coastal salt air, heavy use and skipped maintenance shorten those numbers.
What size AC do I need?
Size depends on a load calculation (Manual J) — insulation, windows, layout and climate — not just square footage. Rules of thumb often oversize systems, which causes humidity problems and short cycling.
What SEER2 rating should I buy?
Federal minimums are 13.4 SEER2 in northern states and 14.3 SEER2 in the South. Higher ratings pay off fastest in hot climates where the AC runs most of the year.
Is a heat pump better than a furnace?
Heat pumps heat and cool efficiently in mild and moderate climates, and cold-climate models work well below freezing. In very cold regions, a furnace or a dual-fuel heat pump setup is often cheaper to run.
HVAC near Boulder
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Other home services in Boulder
Local risk factors reflect general Colorado climate patterns; check FEMA's National Risk Index for county-level ratings. Local estimates apply an approximate regional cost index to national ranges.