No heat
The furnace or heat pump won't come on, or the house keeps getting colder.
What you're probably seeing
The furnace or heat pump won't come on, or the house keeps getting colder.
Likely causes
- A thermostat setting, battery or wiring issue.
- Furnace ignitor, flame sensor, pressure switch or control board.
- A tripped breaker or switched-off furnace.
Safe checks you can do now
- Thermostat on Heat and set above room temperature.
- Check the furnace switch and breaker.
- Replace a clogged filter.
When to call a pro
Now in cold weather. Keep everyone in one warm room and let faucets drip.
General information about common causes, not a diagnosis of your home.
FAQ
Quick answers
Who fixes no heat?
A heating and cooling company. Call (844) 511-3573 to connect with an independent local heating and cooling company.
How much does it typically cost?
Furnace repair: $125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900); HVAC repair: $150–$450 (HomeGuide 2026 national ranges). Your pro sets the real number after seeing the job.
When should I call?
Now in cold weather. Keep everyone in one warm room and let faucets drip.
Related
More heating & cooling problems
Fix nowPlumbing
Gas smell in the house
A rotten-egg smell near the stove, furnace, water heater or meter.
$45–$150 per hour, plus a $50–$200 service call
This weekHeating & Cooling
Furnace blowing cold air
Air comes from the vents but it isn't warm.
$125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900)
This weekHeating & Cooling
Furnace keeps turning on and off
The furnace starts, runs a few minutes and shuts off, over and over.
$125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900)