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Furnace not working
A furnace that won't heat usually points to a few common fixes.
Before anything — check these
If any of these are true, stop and get professional help now:
- Gas smell
- Carbon monoxide symptoms
- No heat in freezing weather
Safe checks you can do
Tick what you've checked. Only do homeowner-safe actions.
Likely causes
| Cause | Likelihood | Severity | Cost |
|---|---|---|---|
| Thermostat setting | high | Low | $0–$100 |
| Clogged filter | medium | Low | $10–$30 |
| Pilot light / igniter | medium | Medium | $150–$500 |
| Blower or flame sensor | low | Medium | $150–$600 |
Recommended next action
Check the thermostat and filter first. If you smell gas, leave and call a pro. Otherwise, call an HVAC technician.
Plan the fix
Once you know roughly what's wrong, size the job and get a cost range:
HVAC System Planner