AC Installation in Longmont
Get fast, fair pricing from licensed local pros. Typical Longmont cost: $4.3k – $8.7k+ installed.
- Central AC (replace)
- $4.3k – $8.7k+
- New central AC + ducts
- $6.5k – $14k+
- Ductless mini-split
- $3.3k – $8.7k
- Permit & inspection
- $80 – $425
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AC installation cost by system.
Installed pricing for Longmont, adjusted for local labor. Higher SEER2 tiers, larger tonnage, and new ductwork add to the base.
In Longmont, Colorado, AC installation costs typically range from $4,300 to $8,700 for a like-for-like central AC replacement, with new systems including ductwork costing $6,500 to $14,100+. Ductless mini-splits run $3,300–$8,700, and heat pumps $5,400–$13,000+. Local factors like the median home age of 37 years, cold semi-arid climate, and Colorado's mechanical permit requirements influence pricing. Many homes use gas heating, making dual-fuel systems a recommended choice for efficient cooling and heating.
- Central AC, like-for-likeExisting ducts in good shape$4,300 – $8,700+
- New central AC + ductworkFirst-time or full duct replacement$6,500 – $14,000+
- Ductless mini-splitSingle or multi-zone, no ducts$3,300 – $8,700
- Heat pump (cooling + heating)Qualifies for federal & local rebates$5,400 – $13,000+
- Permit & inspectionRequired in most jurisdictions$80 – $425
* High-efficiency systems cost more upfront but may qualify for federal tax credits and utility rebates.
Pricing reviewed · Local data from U.S. Census ACS
HVAC systems in Longmont
U.S. Census ACS- Households
- 39,313
- Homeowners
- 25,270
- 61% own
- Median home value
- $488,100
- Median income
- $89,720
- Median home built
- 1989
- Housing units
- 41,429
With a median home built in 1989, many Longmont AC and furnace systems are at or past their 12–15 year lifespan — a common reason replacements spike here.
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What’s different about Longmont.
Generic cost pages skip the things that actually decide your price and which system fits here — local code, climate, and the money you can claim back.
Recommended unit for Longmont
Given Colorado’s cold semi-arid (cold-dry) climate and gas heating, dual-fuel (cold-climate heat pump + gas furnace) is the sensible default for most Longmont homes. A pro can confirm the right size and system for your home with a load calculation.
Sources: Colorado Energy Office - Heat Pump Tax Credit · Xcel Energy Colorado - Heat Pumps & Rebates · EIA - Colorado electricity data
What Longmont code requires
Installing or replacing an HVAC system in Longmont follows Colorado rules under the state mechanical code. Here’s what applies statewide:
- PermitRequired
Mechanical permit pulled by your licensed HVAC contractor; covers equipment, refrigerant, and the electrical disconnect.
- SEER2 minimum13.4 SEER2 (North)
Federal North-region minimum for new split-system AC. Higher tiers cut bills and unlock rebates.
- Load calculationRecommended
Sizing by load calc — not rule of thumb — prevents an oversized unit that short-cycles and never dehumidifies.
- RefrigerantR-454B / R-32 (R-410A phased down 2025+)
- Good to know—
Cold-climate sizing matters: at altitude with sub-zero winters, heat pumps need a low-temp (5F) rating or gas backup; high-altitude mountain towns and Xcel offer enhanced cold-climate heat pump rebates.
Sources: Colorado Energy Office - Heat Pump Tax Credit · Xcel Energy Colorado - Heat Pumps & Rebates · EIA - Colorado electricity data
Not sure which rules and rebates apply to your home?
A licensed Longmont pro will walk you through code, the right unit, and what you can claim back — in one quick call.
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Money back in Longmont
Colorado heating is mostly gas, which shapes the money back:
- State$1,000 upfront rebate in 2026 via registered contractorColorado Heat Pump Tax Credit (Colorado Energy Office) →
State or utility program — verify eligibility before you buy.
- StateUp to ~$2,250 per heating ton (5F) for cold-climate air-source heat pumpsXcel Energy Colorado Heat Pump Rebates →
State or utility program — verify eligibility before you buy.
- Federal30% of cost, up to $2,000Federal 25C tax credit — heat pump →
For a qualifying ENERGY STAR heat pump meeting the CEE efficiency tier. Claimed on your federal return.
- Federal30% of cost, up to $600Federal 25C tax credit — central AC →
For a qualifying high-efficiency central air conditioner.
The federal 25C tax credit (30%, up to $2,000 for a qualifying heat pump and up to $600 for a high-efficiency central AC) applies in every state, including Colorado.
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- 1
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- 2
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- 3
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AC Installation in Longmont, explained.
What Affects AC Installation Costs in Longmont
Prices vary based on system type (central, ductless, heat pump), home size and existing ductwork condition. Older homes may need duct modifications or new ductwork, increasing costs. Climate considerations, such as cold winters and altitude, may require cold-climate heat pumps or gas backup, affecting equipment choice. Federal tax credits (25C) up to $2,000 for heat pumps or $600 for high-efficiency AC can lower net costs.
Common AC Installation Issues in Longmont
Older Ductwork
Many Longmont homes were built around 1989, and original ductwork may be undersized or leaky, requiring repairs or replacement for proper airflow.
Altitude and Sizing
At 5,000 feet elevation, air is less dense, so systems must be properly sized for cooling and heating performance; undersized units struggle in summer.
Permit and Code Compliance
Colorado requires a mechanical permit for AC installation; failing to pull one can lead to fines and issues during home sale.
What to Expect During AC Installation in Longmont
A typical installation starts with a load calculation and permit application. The crew removes old equipment, installs the new unit, connects refrigerant lines (using R-454B or R-32), and tests airflow. The job usually takes one to two days, with final inspection by the local building department.
AC Installation FAQs — Longmont
Yes, Colorado requires a mechanical permit for AC installation. Your contractor should handle the permit and schedule the required inspection.
AC Installation near Longmont
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