How much does HVAC cost in Boulder?
By Our research team · Last verified · Methodology
Most Boulder homeowners pay $3,500–$7,850 to replace a central AC sized at 3 tons on ducts you already have. $5,400 is typical, and a single-zone 12,000 BTU mini-split is $2,250–$5,100.
How we get this data- Typical
- $5,400
- Low end
- $2,600
- High end
- $11,750
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Get my fair quote →The typical Boulder price is $5,400, 13% below the US typical of $6,200.
Boulder's price band
Boulder is cheaper than 74% of the 195 US metros we price for HVAC work.
Most Boulder AC replacements land between $3,500 and $7,850, with $5,400 the typical price for a 3-ton system on existing ducts. Doing the furnace at the same time brings it to $5,900–$14,550, and a heat pump instead of an AC is $5,000–$11,350.
Front Range summers are dry, so evaporative coolers suit many homes, and furnaces at this altitude need high-altitude setup. Power Ahead Colorado's 2026 cost guide puts a 3-ton cold-climate heat pump at $18,000–$24,000 installed, with Xcel, city and state incentives worth $1,800 to $17,000 in its examples.
Every figure below includes equipment and installation. The usual extras are the permit at $90–$220, a new refrigerant line set at $180–$570, and any ductwork or electrical fixes the contractor finds.
Comparing cities, or after the US-wide picture? See the national guide: HVAC cost in the USA.
$3,500–$7,850 to replace a 3-ton central AC on existing ducts in Boulder, installed — $5,400 typical. A heat pump runs $5,000–$11,350, a gas furnace $2,550–$7,300, and AC + furnace together $5,900–$14,550. Verified November 2026. Get free Boulder quotes →
- 3-ton central AC on existing ducts: $3,500–$7,850 ($5,400 typical)
- Heat pump, 3-ton: $5,000–$11,350; gas furnace: $2,550–$7,300
- AC + furnace together: $5,900–$14,550
- Mini-split: $2,250–$5,100 for one 12,000 BTU zone, $7,300–$16,350 for four
- Downtown Boulder & Pearl Street runs 5–10% above the city average; CU Boulder & University Hill: standard to 5% below
Prices verified November 2026 · Cross-referenced against 45+ American pricing sources · See methodology
Installed prices for the Boulder metro, re-verified November 2026. Equipment-heavy jobs move less with local labor costs than service calls do.
| Service | Low | Typical | High |
|---|---|---|---|
| Central AC replacement, 3-ton (existing ducts)installed | $3,500installed | $5,400 | $7,850 |
| Central AC + gas furnace, replaced togetherinstalled | $5,900installed | $8,900 | $14,550 |
| Heat pump replacement, 3-ton (existing ducts)installed | $5,000installed | $7,300 | $11,350 |
| Central heat pump, high-efficiency with zoning (3-ton)installed | $9,100installed | $13,200 | $19,100 |
| Gas furnace replacement (80–96% AFUE)installed | $2,550installed | $4,200 | $7,300 |
| Ductless mini-split, 1 zone, 9,000 BTUinstalled | $2,000installed | $3,000 | $4,350 |
| Ductless mini-split, 1 zone, 12,000 BTUinstalled | $2,250installed | $3,550 | $5,100 |
| Ductless mini-split, 1 zone, 18,000 BTUinstalled | $2,900installed | $4,550 | $6,550 |
| Ductless mini-split, 1 zone, 24,000 BTUinstalled | $3,450installed | $5,650 | $8,000 |
| Ductless mini-split, 1 zone, 30,000–36,000 BTUinstalled | $4,350installed | $7,100 | $10,450 |
| Multi-zone mini-split, 2 zonesinstalled | $4,100installed | $5,900 | $9,100 |
| Multi-zone mini-split, 4 zonesinstalled | $7,300installed | $10,900 | $16,350 |
| Like-for-like AC swap: same-size mini-split, existing line setinstalled | $2,100installed | $3,200 | $4,750 |
| Install only: homeowner-supplied mini-split, 1 zonelabor only | $440labor only | $960 | $1,750 |
| Evaporative (swamp) cooler, roof-mountedinstalled | $1,200installed | $2,100 | $3,250 |
| Ductwork replacement, whole houseinstalled | $2,250installed | $4,950 | $8,500 |
| AC compressor replacement (out of warranty)per repair | $1,200per repair | $1,900 | $2,750 |
| AC repair, major: refrigerant leak fix + rechargeper repair | $540per repair | $1,150 | $2,250 |
| AC repair, minor: capacitor, contactor or drain lineper repair | $130per repair | $270 | $530 |
| AC tune-upper visit | $65per visit | $95 | $170 |
| Whole-system HVAC tune-up (AC + furnace)per year | $130per year | $200 | $390 |
| Duct cleaning, whole houseper home | $260per home | $390 | $610 |
| Smart thermostat, installedinstalled | $190installed | $280 | $420 |
| Old AC or furnace removal and disposalper unit | $90per unit | $220 | $440 |
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Prices verified November 2026 · Cross-referenced against 45+ American pricing sources · See methodology
Prices cover the Boulder metro: the city and its close suburbs. Outlying towns can run a little lower; Downtown Boulder & Pearl Street runs a little higher.
HVAC prices across Boulder
Where you live changes the quote. Downtown Boulder & Pearl Street costs the most because of access and older buildings; CU Boulder & University Hill usually comes in at or under the city typical.
Downtown Boulder & Pearl Street
- Installed
- $3,700–$8,650 installed
- Typical job
- $5,100–$6,850 / 3-ton AC swap
Older homes and mid-rise buildings. A like-for-like condenser swap is routine, but rooftop units and long line runs push quotes toward the top of the range.
North & East Boulder
- Installed
- $3,550–$8,250 installed
- Typical job
- $4,950–$6,500 / 3-ton AC swap
A mix of renovated older homes and newer builds. Ductless mini-splits are common where old houses never had ducts.
CU Boulder & University Hill
- Installed
- $3,350–$7,700 installed
- Typical job
- $4,650–$6,100 / 3-ton AC swap
Rentals and older houses near campus. Landlord jobs tend to be quick like-for-like swaps of smaller systems, which keeps prices a little under the city average.
Longmont, Louisville & Lafayette
- Installed
- $3,500–$8,300 installed
- Typical job
- $4,850–$6,600 / 3-ton AC swap
Bigger homes with garages and attics. Many need 4 to 5 tons or two systems, and attic air handlers take longer to swap than ones in a garage or closet.
Real-world HVAC costs in Boulder
Here's what common HVAC jobs cost in Boulder in 2026, a 3-ton central AC replacement on existing ducts, installed.
Swap a 3-ton AC on good ducts
Same spot, same size, matched indoor coil, old unit hauled away. Most Boulder jobs land near $5,400; a 17+ SEER2 unit adds about $1,850.
Replace the AC and gas furnace together
The usual move when both are 15+ years old. One install, one warranty, a matched system. Typical is $8,900.
Switch from AC + furnace to a heat pump
A 3-ton heat pump on existing ducts, typically $7,300. Keeping the furnace as backup (dual-fuel) runs $6,450–$15,450.
Cool one room with a mini-split
A 12,000 BTU single-zone mini-split for a bedroom, office or addition, typically $3,550. A 9,000 BTU unit for a small room is $2,000–$4,350.
Cool a whole home with no ducts
A 4-zone ductless system, typically $10,900. Adding ducts for central AC instead costs $2,250–$8,500 before the equipment.
How much does HVAC cost in Boulder?
$3,500–$7,850 installed, with $5,400 the typical Boulder price. The spread is mostly the equipment tier and the install: a standard unit on a ground pad is a one-day job, while rooftop condensers, attic air handlers and new line sets add hours.
If the furnace is old too, doing both at once ($5,900–$14,550) usually costs less than two separate jobs. A 3-ton heat pump that heats and cools runs $5,000–$11,350, and a high-efficiency zoned heat pump $9,100–$19,100.
Central AC, heat pump and furnace prices in Boulder (2026)
A 3-ton central AC runs $3,500–$7,850, a 3-ton heat pump $5,000–$11,350, and a gas furnace $2,550–$7,300, all installed.
| Line on the quote | Low | Typical | High |
|---|---|---|---|
| Central AC replacement, 3-ton (existing ducts) | $3,500 | $5,400 | $7,850 |
| Heat pump, 3-ton (existing ducts) | $5,000 | $7,300 | $11,350 |
| Gas furnace (80–96% AFUE) | $2,550 | $4,200 | $7,300 |
| Central AC + gas furnace together | $5,900 | $8,900 | $14,550 |
| Mini-split, 1 zone, 12,000 BTU | $2,250 | $3,550 | $5,100 |
| Mini-split, 2 zones | $4,100 | $5,900 | $9,100 |
| Mini-split, 4 zones | $7,300 | $10,900 | $16,350 |
| Ductwork replacement, whole house | $2,250 | $4,950 | $8,500 |
The gap between an AC and a heat pump in Boulder is about $1,900 at the typical price. That gap buys heating as well as cooling, so it matters most when the furnace is near the end of its life.
What moves an HVAC quote in Boulder:
- Size: a 2-ton system runs about $4,550 and a 5-ton about $7,600 at the typical price. Ask for a Manual J load calculation.
- Efficiency: the minimum here is 13.4 SEER2; a 17+ SEER2 two-stage unit adds about $1,850.
- Access: attic air handlers, rooftop condensers and tight closets add labor, most often in Downtown Boulder & Pearl Street.
- Line set and coil: a new line set runs $180–$570, and the indoor coil has to match the new refrigerant.
- Season: spring and fall bring the best prices; a breakdown during a summer heat wave brings the worst.
Ask every Boulder contractor for the same things: tonnage, SEER2 rating, model numbers for both the outdoor and indoor units, and whether the permit and line set are included. Compare those, not just the total. Get a quote for your heating and cooling work →
HVAC cost in Boulder by home size
About $4,900 for a 2.5-ton AC (1,000–1,600 sq ft), $5,400 for 3 tons (1,600–2,000 sq ft), and $6,650–$7,600 for 4–5 tons in homes over 2,500 sq ft, typical Boulder prices on existing ducts.
Worked example: a 2,000 sq ft Boulder home with a 16-year-old AC and furnace. Replacing both runs about $8,900; switching to a 3-ton heat pump on the same ducts runs about $7,300; replacing only the AC is $5,400 but leaves an old furnace in place.
Homes over 2,500 sq ft or with two floors often have two systems or zoning. A high-efficiency zoned heat pump runs $9,100–$19,100, and adding zoning to an existing system $1,550–$4,100.
Boulder HVAC costs by system type
| System type | Cost | Best for |
|---|---|---|
| Central AC, 3-ton (existing ducts) | $3,500–$7,850 installed | Homes with sound ducts and a furnace or air handler to pair with |
| Ductless mini-split, single zone (9,000–18,000 BTU) | $2,000–$6,550 installed | One room, an addition, or a home with no ducts |
| Multi-zone ductless mini-split (2–4 zones) | $4,100–$16,350 installed | Whole homes with no ducts, room-by-room control |
| Heat pump, 3-ton ducted (heats and cools) | $5,000–$11,350 installed | Mild and hot climates; replacing an AC and electric heat |
| Gas furnace + AC, replaced together | $5,900–$14,550 installed | Cold climates with natural gas and old equipment on both sides |
| Gas furnace only (80–96% AFUE) | $2,550–$7,300 installed | When the AC is newer than the furnace |
| Dual-fuel: heat pump + gas furnace | $6,450–$15,450 installed | Cold climates: electric heat most days, gas on the coldest |
| Cold-climate heat pump, 3-ton ducted | $8,650–$21,850 installed | Northern homes leaving gas, oil or propane |
| Central heat pump, high-efficiency with zoning | $9,100–$19,100 installed | Big or two-story homes with hot and cold rooms |
| Evaporative (swamp) cooler, roof-mounted | $1,200–$3,250 installed | Dry Western climates only |
| Geothermal heat pump (ground loop) | $13,650–$31,850 installed | Large lots and long stays in one home |
| Window or through-the-wall AC | $190–$1,050 installed | Single rooms and renters; cheapest way to cool |
Equipment vs installation: the Boulder AC bill
On a typical $5,400 3-ton swap in Boulder, the condenser and matched coil are roughly $2,150–$3,250 and the rest is labor, materials, the permit and overhead. Labor usually makes up 40–60% of an AC replacement.
Buying the unit yourself rarely saves much: many contractors won't install customer-supplied equipment, and the ones who do charge $440–$1,750 or more for a mini-split and won't cover the parts. Brand warranties often require a licensed installer.
What's included in a Boulder AC replacement (and what costs extra)
A standard replacement quote covers the outdoor unit, a matched indoor coil, refrigerant, connection to your existing ducts and wiring, removal of the old unit, and startup. Common extras:
- Permit and inspection: $90–$220, often built into the quote
- New refrigerant line set: $180–$570 if the old one can't be reused
- New condenser pad: $35–$220
- Electrical panel upgrade: $750–$3,550, mostly when adding a heat pump or more capacity
Ask for the AHRI certificate showing the matched rating of your outdoor and indoor units. It proves the system you paid for is the one that was installed.
Boulder's climate
Front Range summers are dry, so evaporative coolers suit many homes, and furnaces at this altitude need high-altitude setup. Power Ahead Colorado's 2026 cost guide puts a 3-ton cold-climate heat pump at $18,000–$24,000 installed, with Xcel, city and state incentives worth $1,800 to $17,000 in its examples.
System size
Each ton adds equipment cost: about $4,550 for 2 tons and $6,650 for 4 tons at the typical Boulder price. A Manual J load calculation often shows a smaller system will do.
Efficiency rating
The federal minimum for a new split AC here is 13.4 SEER2. Higher ratings cost more upfront and pay back fastest where AC runs most of the year.
New refrigerants
New systems use A2L refrigerants (R-454B or R-32), so the indoor coil must match the outdoor unit. That's why condenser-only swaps are rare now, and why older R-410A systems cost more to service.
Ducts and access
Leaky or undersized ducts, attic air handlers and rooftop condensers add hours. Whole-house duct replacement runs $2,250–$8,500.
Location: Downtown Boulder & Pearl Street vs CU Boulder & University Hill
Downtown Boulder & Pearl Street jobs cost more because of access, parking and older buildings. CU Boulder & University Hill quotes usually sit at or a little under the city typical.
Season and urgency
Replacing on your schedule in spring or fall is cheaper than an emergency swap in a heat wave. After-hours repair labor runs $140–$220 an hour.
- Get three quotes for the same system.Same tonnage, same SEER2 rating, model numbers on every quote. Boulder quotes for the same 3-ton swap run anywhere from $3,500 to $7,850.
- Replace before it fails.If your system is 12–15+ years old, replace it in spring or fall. Emergency replacements in peak season leave no room to shop around.
- Right-size the system.Ask for a Manual J load calculation. An oversized AC costs more, cycles on and off, and leaves the house clammy.
- Check your utility for rebates.There is no federal tax credit for systems installed in 2026, but many utilities still pay rebates on efficient heat pumps and AC. Check before you sign; most require pre-approval or a listed contractor.
- Do the AC and furnace together if both are old.One install of both runs $5,900–$14,550, less than two separate jobs.
- Keep up with tune-ups.A yearly tune-up at $65–$170 catches weak capacitors and low refrigerant before they kill a compressor ($1,200–$2,750).
Before you pay a deposit to a Boulder HVAC contractor, get these in writing:
- Tonnage and how it was sized (a Manual J load calculation)
- Model numbers for the outdoor unit and the indoor coil or air handler
- The matched SEER2 (and HSPF2 for a heat pump) rating
- Whether the line set is new, flushed or reused
- Permit, inspection and removal of the old unit
- Thermostat, pad, disconnect and any electrical work
- Parts and labor warranty terms, and who registers the equipment
- Total price, deposit, and start and finish dates
How much does it cost to replace a central AC in Boulder?
$3,500–$7,850 for a 3-ton system on existing ducts, installed, with $5,400 typical in Boulder. Higher-efficiency units, attic or rooftop installs and new line sets push it up.
How much does a heat pump cost in Boulder?
$5,000–$11,350 for a 3-ton heat pump on existing ducts, about $7,300 typical. A high-efficiency zoned system runs $9,100–$19,100.
How much is a new furnace in Boulder?
$2,550–$7,300 for a gas furnace installed, about $4,200 typical. With a new AC at the same time, $5,900–$14,550.
How much does a mini-split cost in Boulder?
$2,250–$5,100 for a 12,000 BTU single zone, $4,100–$9,100 for two zones and $7,300–$16,350 for four.
How much is an AC tune-up in Boulder?
$65–$170 per visit. A yearly plan for AC and furnace runs $130–$390.
How much does AC repair cost in Boulder?
$130–$530 for common fixes like a capacitor or contactor. A refrigerant leak repair with recharge runs $540–$2,250, and a compressor $1,200–$2,750.
What size AC does a Boulder home need?
As a rough guide, 2.5 tons covers about 1,000–1,600 sq ft and 3 tons about 1,600–2,000 sq ft, but insulation, windows and climate change that. Ask for a Manual J load calculation instead of matching the old unit.
Is there a tax credit for a new AC or heat pump in Boulder?
No federal one for 2026: the 25C credit covered improvements made through December 31, 2025. Utility and state rebates may still apply, so check before you buy.
Do I need a permit to replace an AC in Boulder?
Usually, yes. Most US cities and counties require a mechanical permit for an AC or furnace replacement, typically $90–$220, and a licensed contractor normally pulls it.
How much does it cost to add ducts in Boulder?
$2,250–$8,500 for whole-house ductwork, before the AC or heat pump. In many older homes a multi-zone mini-split ($7,300–$16,350 for four zones) costs less.
Prices verified November 2026 · Cross-referenced against 45+ American pricing sources · See methodology
Prices for the Boulder metro area, November 2026. Outer suburbs may vary.
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