Why Is My Furnace Blowing Cold Air

furnace repair Garner NC

When the weather outside is frightful, you don’t need to rely on a fire to keep your home warm – that’s what your furnace is for. But what happens if, rather than keeping your house warm and cozy, your furnace is blowing cold air instead? Often, this is a fairly simple solution, and our furnace repair company in Garner is sharing some causes for this problem as well as some ways to troubleshoot.

The Thermostat Is Set Incorrectly

If you’ve ever had a device not come on and start panicking that it’s broken, only to realize it’s not plugged in…Your thermostat being set incorrectly is a similar situation. If you feel your furnace is blowing cold air, check your thermostat first, and make sure it’s not set on cool. Whether someone bumped it, a child was playing with it, or you had a warm day not long ago and forgot to reset it, this is a common problem with a very simple solution.

Your Thermostat Isn’t Compatible with Your Furnace

Thermostats aren’t universal to every furnace, so if you have a furnace that’s older than 10 years old, and you purchased a new smart thermostat, like a Nest, it may simply be that the two aren’t compatible.

There are three types of thermostats:

  • Low Voltage – the most common type seen in newer systems;
  • Line Voltage – seen with electric baseboard heating and older systems;
  • Millivolt – often used in direct vent furnaces and mobile home systems;

Most smart thermosets are low voltage, so if you have a line voltage or millivolt, it will kick the system on, but it will blow cold air.

Similarly, consider the stage of your system. A single stage system runs at full capacity all the time while a multi-stage (or stage two system) can run at low or high speeds. Some thermostats aren’t compatible with multi-stage systems.

Not sure if your new thermostat is compatible with your furnace? Contact an experienced HVAC technician to find out for sure.

Change the Air Filter

Your air filter keeps dirt, dust, and allergens from getting into your furnace, but if it’s clogged, fresh air can’t get in at all. When this happens, the furnace can overheat, shutting down the burners. The heater will still continue to kick on, but without burners to heat the air before it moves into the ductwork, your furnace will blow cold air.

The Pilot Light Is Out

Is your furnace in a drafty basement or other area where a small flame can easily be blown out? If so, that may be the problem if you have an older furnace (newer furnaces have electric pilots that don’t need to be on all the time). The pilot is a small flame that is continuously lit to keep the larger burners going when the heat kicks on, but if it goes out, there’s no spark to light the larger burners, thus, no heat traveling through the ducts.

Reaching Out to a Furnace Repair Company

If your furnace is blowing cold air, and simple fixes like checking the thermostat and changing the air filter don’t help, this is probably a job for the professionals. Trying to fix a furnace on your own can be significantly more dangerous and complicated than you realize, even something that seems simple, like cleaning a gas valve or changing an oil filter. An improper repair can lead to more serious damage and even a risk for fire, so it’s best to call an experienced technician who can properly diagnose the problem, fix it fast, and have your furnace heating your home like it should be.

Schedule Furnace Repair for Your Garner Home Today

You rely on your furnace to keep your home cozy and comfortable through chilly Raleigh winters. Whether it’s blowing cold air or there’s something else wrong, an experienced HVAC technician from Bowman Mechanical Services can quickly spot the problem and restore heat and comfort to your home. Give us a call at 919-679-9756 or fill out our contact form below to schedule service or get a free estimate!