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

If your heater isn’t working, first check the thermostat is on Heat and powered, confirm the system has electricity, and call an HVAC technician if heat doesn’t return. Most no-heat calls come from incorrect thermostat settings, tripped breakers, or a clogged air filter blocking airflow. A common technician find is a loose furnace door holding the safety switch open so the unit won’t start. We service homes across the Columbia area with same-day diagnostics and 24/7 emergency availability when needed.

Try these safe steps before you call:

• Set thermostat to Heat, then 3–5°F above room temperature; replace batteries.
• Verify the furnace/air handler switch is on and the breaker isn’t tripped; reset once only.
• Inspect and replace a dirty filter to restore airflow.
• For heat pumps, clear snow/ice and allow 10–15 minutes if it’s in defrost mode.

If you smell gas, notice burning odors, breakers keep tripping, or indoor temps approach freezing, stop troubleshooting and call a professional immediately.

Updated: 2026-04-02

Need help in Columbia, MD? Call (410) 593-1980 or book online.