What Should I Do If My Heater Is Not Working in My House?

If your heater isn’t working, try a few quick checks, then call Cardinal Heating & Air Conditioning for 24/7 emergency service. Verify the thermostat is set to Heat and above room temperature. Make sure the furnace switch and circuit breaker are on. Replace a dirty air filter. For heat pumps or boilers, look for obvious leaks or ice and shut the system off if you see a safety issue. We service furnaces, boilers, heat pumps, and radiant systems in Madison and Sun Prairie. <br/> Updated: 2025-12-23 00:00:00 <br/> Need help in Fitchburg, WI? Call (608) 291-6473 or book online. "They were incredibly professional and courteous as they got the work done." — Jim C.