Here are the common reasons for a furnace or air conditioner not working, along with some troubleshooting tips:
- Thermostat problems: Check the settings, make sure it's set to the right temperature and calling for heat or cool, and check for power or replace batteries.
- Clogged air filters: Replace often and make sure they aren't too thick to avoid restricted airflow, overheating, or shutdowns.
- HVAC kill switch: Check if it's turned off before calling a technician, as it's a basic fix but can cost you $150 to flip a light switch
- Humidifier running in summer: Turn it off when the furnace isn't running to avoid issues with your air conditioner.