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My Furnace is Blowing Cold Air — What’s Gone Wrong?

Your furnace can only do what it's told, so if your thermostat, gas valve, or pilot lights are sending the wrong signal, the system won't be able to keep you warm and toasty.

Reasons Why Your Furnace Can't Keep You Warm

It’s no secret that a warm home is a happy home, so when your heater's blowing cold air, don't just throw yourself under the covers — it’s time to act! Fortunately, there are a few things you can do before calling a professional to try and solve the problem yourself.

Potential Issues

  • furnace is blowing cold air
  • heating unit won't turn on
  • no heat coming from vents

The pilot light is the internal flame that keeps the heart of your furnace running. Each time your thermostat tells the furnace to turn on the heat, it uses the small, ever-burning pilot light to relight the burners. If it goes out for any reason, then the burners won't be able to light and your furnace won't be able to produce heat. In most cases, the pilot light can simply be relit. If it won't relight, there may be more significant issues with your furnace.

  • furnace is blowing cold air
  • puddle around the indoor air conditioning unit
  • high electricity bills
  • pockets of cold air

A duct system consists of a series of tubes in the walls, floors, and ceilings that run through your home. Sealing and insulating ductwork prevents leaks and keeps the air warm or cool (depending on season) while it makes the journey to your vents. This means your HVAC system doesn't have to work overtime to keep up with the thermostat, which is better for the planet and your wallet. Since air follows the path of least resistance, it's also important to make sure no ducts are squeezed or damaged. Any of these situations can cause high energy bills and an uncomfortable home!

  • fan runs even when the heat/cooling shuts off
  • furnace is blowing cold air

There are different models of thermostats, and each model is programmed differently. Many thermostats have a fan setting called "on." If your fan is set to on, it will continue to blow air throughout your home, even when your heating system is off. This can lead to cold air coming from your vents, and rooms that feel drafty. You can change this setting to "auto," or on some newer thermostats, you can select "circulation." Both of these options turn the fan on while your heating and cooling systems are running, but the circulation setting will also ensure the fan turns on periodically between heating and cooling cycles to improve airflow in your home.

Let's Get It Fixed!

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