What To Do If My Heater Is Blowing Cold Air - Over time, air filters accumulate dust and debris, restricting the airflow and causing. Web dirty or clogged air filters. Web if your furnace only blows cold air after you’ve turned on the heat, start your troubleshooting at the thermostat. When the heat is on, your hvac system should distribute warm air into your home.
When the heat is on, your hvac system should distribute warm air into your home. Over time, air filters accumulate dust and debris, restricting the airflow and causing. Web dirty or clogged air filters. Web if your furnace only blows cold air after you’ve turned on the heat, start your troubleshooting at the thermostat.