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What does it mean when cold air is blowing out of your furnace?
Sunday, November 08, 2015

Talking Tech: What does it mean when cold air is blowing out of your furnace?


This is the first in a series of articles to help homeowners understand the potential issues that are occurring when their heating and air conditioning systems stop functioning as expected.  Since we are entering the winter season we will focus on heating system repairs for the next few months.  In this installment we look at gas furnace repairs.  Specifically, what could be happening when the air is blowing out of the supply registers on a cold blustery day but it’s not hot.

One possible cause could be that your high temperature limit switch has tripped.  Your gas furnace has a safety feature called a high temperature limit switch.  This switch automatically shuts off the gas burners when it senses the temperature reaching a dangerous point.  Effectively eliminating the source of your heat.  However, the limit switch does not shut off the blower that pushes air through your ductwork.  Hence you end up with a situation where you have air blowing through your ductwork that is not getting heated. 

There are several issues that could cause the high temperature limit switch to shut off your gas supply to your furnace.  These include a cracked heat exchanger, a dirty filter, a clogged up evaporator coil, or not enough airflow running through your furnace.

While homeowners can change out their filter as a first do-it-yourself step, most of the other solutions require a trained heating and air professional to diagnose and correct.  At G+S Heating Air Energy Services, we are here for you 24/7 year round to solve your heating repairs. 

Give us a call and experience the G+S difference. 

Honest. Fair. Reliable. Since 1959.

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