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Furnace Won’t Shut Off

Each winter we get the question “Why won’t my furnace turn off?” Your furnace is designed to work in conjunction with your thermostat. At your house, you set your thermostat to keep your home at a preset desired temperature. Your furnace will run until it satisfies that preset temperature. If you want your house to feel like it is 70°F then it will work to make it feel 70°F. Having your furnace run continually not only consumes energy, which costs you money, but it is also hard on your HVAC equipment. Let’s try and get to the root of the problem and save you money and give your furnace a break.

Let’s check the simplest things first. Go to your thermostat and check to make sure it is set to “heat” and not “cool.” Next, look to see if your fan is set on “auto” or “on.” If it is set to “on,” it will cause your blower motor to run continuously. If you go over to a register and feel the air, is it warm or cold? If it is warm, it is your whole furnace running. If it is cool, it may just be your fan running. Turn the fan to “off” or “auto” and see what happens. Now look to see what temperature is set on the thermostat. Try adjusting the temperature a few degrees warmer than whatever your current room temperature is. Again, make sure the thermostat is set to “heat” and listen for the “click” that tells you your furnace is turning on. If you don’t hear the infamous “click,” your thermostat could be the problem.

Another reason that your furnace may be running continually is because your filter is dirty. When your filter is dirty, it makes the equipment work harder in order to get the temperature to where you want it. A dirty filter causes the equipment to run more and is less efficient, costing you more money on your utility bill. Bottom line, change your filter regularly.

Did you know that HVAC equipment, like the furnace in your home, is designed based on the average temperatures of the city that you live in? For example, HVAC equipment that is designed for the Indianapolis area, according to ASHRAE (American Society of Heating, Refrigeration and Air Conditioning Engineers), should maintain a temperature of 70°F in your home when the outside temperature is down to 2°F. But and there is always a but, there are a lot of factors to keep in mind. How long has it been 2°F outside? What is your heat loss/heat gain factor in your house? Is your home well insulated? How efficiently is your furnace running? For example, remember the year when temperatures hit -39°F with the wind chill? There is no way your furnace will be able to keep up and be able to maintain 70°F with those outdoor temperatures. Those temperatures are not the norm for this area. Plan to use layers.

If you have done some troubleshooting and your furnace is still running continuously, call Godby. We will send a service technician to your home to get your furnace running correctly. While you have a knowledgeable HVAC person in your home, ask questions. It is always a good idea to be an informed consumer. When you need help with your HVAC system, call Godby HPE.

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