Tools That May Help
Before calling a professional, these common tools may help you check the issue safely.
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Problem
Your furnace started blowing cold air after replacing the thermostat.
Common Symptoms
- Weak airflow from vents
- System running constantly
- Uneven indoor temperatures
- Higher energy bills
Possible Causes
- Incorrect wiring
- Wrong settings
- Compatibility issue
How To Fix It
- Check wiring
- Verify heat mode
- Confirm compatibility
Safety Tip
Always shut off power to the HVAC system before inspecting wiring or internal components.
When To Call A Professional
If furnace does not produce heat
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