If your furnace stopped working in the middle of a Colorado winter, the first question you probably have is: how much is this going to cost? As a NATE Certified HVAC company that has repaired hundreds of furnaces across the Denver metro, we can give you real, honest numbers.
Common Furnace Repairs & Their Costs
| Repair | Cost Range | Difficulty |
|---|---|---|
| Igniter replacement | $150 – $300 | Low |
| Thermocouple / flame sensor | $150 – $250 | Low |
| Draft inducer motor | $300 – $600 | Medium |
| Blower motor replacement | $400 – $700 | Medium |
| Control board replacement | $300 – $700 | Medium |
| Heat exchanger repair/replace | $600 – $1,500+ | High |
| Gas valve replacement | $350 – $600 | Medium |
What Affects the Cost in Denver?
Several factors specific to Colorado can affect your furnace repair bill:
- High altitude adjustments — Furnaces in Denver (5,280 ft) need to be calibrated for thinner air. Not all technicians know how to do this correctly, which can lead to repeat visits.
- Brand and age of system — Parts for older or discontinued brands cost more and can take longer to source.
- Emergency timing — Many companies charge $150–$300 extra for nights and weekends. On Time Heat & Air does not charge overtime fees.
- Diagnostic fee — Typically $89–$150. We waive the diagnostic fee with any completed repair.
Should I Repair or Replace My Furnace?
A good rule of thumb: if your furnace is under 10 years old and the repair costs less than $1,000, repair it. If it's over 15 years old or the repair exceeds 50% of a new system cost, replacement usually makes more financial sense — especially with Colorado's 2026 high-efficiency furnace rebates.
How to Avoid Expensive Furnace Repairs
- Change your air filter every 1–3 months (dirty filters cause 80% of preventable breakdowns)
- Schedule an annual furnace tune-up each fall before heating season
- Keep the area around your furnace clear of clutter and debris
- Don't ignore warning signs: unusual noises, yellow pilot light, rising energy bills
On Time Heat & Air — Upfront Furnace Repair Pricing
We provide flat-rate pricing before any work begins — no hourly surprises, no hidden fees. Our NATE Certified technicians carry common parts on their trucks to complete most repairs in a single visit. We serve Brighton, Denver, Aurora, Commerce City, Thornton, Castle Rock, Westminster, Arvada and 32 more communities across 8 licensed Colorado counties.