Clogged and dirty furnace filter

When your furnace suddenly begins to blow cold air after distributing hot air it can cause some confusion and major concerns. A properly working furnace is definitely a necessity during the winter months in Northwestern PA, not to mention they are expensive to replace.

One of the most common signs of a furnace overheating is blowing cold air after blowing hot air. When the furnace becomes overheated, it turns off the blowers and continues to blow cold air in order to cool the furnace down – a safety mechanism on the furnace.

If you’ve noticed this problem with your furnace, it is very important to not allow your furnace to constantly overheat. An overheated furnace wears and tears on your furnace’s heat exchanger which is very expensive to repair or replace.

The source of this problem is often a dirty furnace filter. A dirty filter blocks and restricts airflow. Your furnace then uses more energy and runs longer to heat your home which causes the furnace to overheat. A furnace operating with a dirty filter causes the furnace to work even harder and decreases its life span.

Your furnace filter should be cleaned or replaced every 1 to 2 months, especially during the colder months when your furnace is being used constantly. A clean filter will improve the airflow of your furnace and your furnace will last longer. When your filter is dirty, dust, animal hair and other debris are being blown all around your home. A furnace with a clean filter will improve the quality of the air in your home and as a result could improve the health of you and your family.

If you are still experiencing this problem even after you’ve changed the filter, you should seek help from an HVAC technician. The problem could be a pilot light failure, gas supply issue, a leak in the air duct or a clog. An HVAC technician will be able to properly diagnose the problem and get your furnace working correctly.