Furnace Repair in Longmont
Get fast, fair pricing from licensed local pros. Typical Longmont cost: $85 – $275 installed.
- Flame sensor
- $85 – $275
- Igniter
- $175 – $500
- Blower motor
- $425 – $1.6k
- Control board
- $325 – $850
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Furnace repair cost by part.
Typical Longmont repair pricing including parts and labor. A diagnostic fee usually applies and is often credited toward the work.
Furnace repair in Longmont, Colorado, typically costs between $80 and $225 for a diagnostic fee, plus parts and labor. With a median home age of 37 years, many homes have older furnaces that may need repairs like flame sensor or igniter replacement. Local pricing for common repairs ranges from $85–$275 for a flame sensor to $1,650–$3,800+ for a heat exchanger. Colorado requires a mechanical permit for furnace repairs, and cold-climate sizing is important due to Longmont's cold semi-arid climate with sub-zero winters. Many homes use gas heating, but dual-fuel systems with a heat pump and gas backup are recommended for efficiency and reliability.
- Diagnostic / service callOften credited toward the repair$80 – $225
- Flame sensor or thermocoupleCommon no-heat cause on gas units$85 – $275
- Hot-surface igniterFurnace clicks but won’t light$175 – $500
- Blower motorNo airflow / weak airflow$425 – $1,650
- Heat exchangerCracked exchanger often means replace$1,650 – $3,800+
* A cracked heat exchanger is a safety issue — on an older furnace, replacement is usually the call.
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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Furnace Repair in Longmont, explained.
What affects furnace repair costs in Longmont?
Repair costs in Longmont vary based on the part needed, labor rates, and permit requirements. Older homes (median built 1989) may have outdated systems that require more labor. The cold climate means repairs like heat exchanger replacements are critical and can be costly. Additionally, high-altitude conditions may affect system performance, and using a licensed contractor who pulls permits adds to the cost but ensures code compliance.
Common furnace repairs in Longmont
Flame sensor failure
A dirty or faulty flame sensor can cause the furnace to cycle on and off. Repair cost: $85–$275.
Igniter problems
A broken igniter prevents the furnace from lighting. Replacement cost: $175–$500.
Blower motor issues
A failing blower motor reduces airflow and heating efficiency. Replacement cost: $425–$1,650.
What to expect during a furnace repair in Longmont
A technician will first diagnose the issue, charging a fee of $80–$225. They will then provide a quote for the repair, which may require a mechanical permit from the city. For major repairs like heat exchanger replacement, the job may take a full day. Always ask for an upfront estimate before work begins.
Furnace Repair FAQs — Longmont
Yes, Colorado requires a mechanical permit for most furnace repairs, especially those involving gas lines or major components. Your contractor should handle the permit.
Furnace Repair near Longmont
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