Here at DVO, we take the health of our team and your family very seriously.

What Causes The Furnace To Blow Cold Air?

A furnace, also known as a heater or boiler, is commonly used in the US to keep households warm during harsh winters. It has become a necessity in many, if not all households, and sudden breakdowns can be very inconvenient. This article highlights common factors that cause furnaces to blow cold air and what you should do as a homeowner.

Some of the issues can be easily rectified by you, while others require professional assistance. Contact DVO Heating and Air Conditioning for furnace repairs in Mesquite, TX.

Common Reasons Why Your Furnace is Blowing Cold Air

Faulty Thermostat

Make it a habit to always check the thermostat settings after switching on your HVAC system. Incorrect settings or faulty sensors can make you uncomfortable and increase energy consumption and utility bills. Make sure the temperature setting is as required. If your furnace is still blowing cold air, contact DVO Heating and Air Conditioning for HVAC repair in Mesquite, TX.

Dirty Air Filters

The filters inside the furnace trap dust and debris inside the room and provide you with cleaner and healthier air. Over time, they become clogged and lose their function. A dirty filter significantly increases the load on the system and can cause your furnace to blow cold air. As a homeowner, you should periodically clean the air filters weekly.

Pilot Light Malfunction

If your pilot light is off, there is a malfunction in the furnace’s ignition system. Inadequate gas is the major reason for ignition failure. Switch off and reignite the pilot light. If the problem persists and you observe a flame streaming above, it requires professional assistance. Contact DVO Heating and Air Conditioning for furnace repair in Mesquite, TX, immediately.

Damaged Ducts

Modern furnaces have high-quality condensate ducts that help remove the moisture generated during the heating process. As a safety feature, a clogged duct will immediately stop fuel ignition. Major holes and cracks in the older ducts can help the hot air escape resulting in ineffective heating. Do not try to clean or repair the ducts by yourself. Contact DVO Heating and Air Conditioning furnace repair in Mesquite, TX and surrounding areas.

Inadequate Gas

Most furnaces burn propane, electricity, or natural gas to produce hot air circulated through major ducts. An inadequate gas supply or severed lines can automatically switch off the furnace ignition. Always check the main supply and ensure there are no loose pipes. Call for professional help immediately. If you face issues with the gas pipes, make sure you switch off the main supply.

Troubleshooting Common Furnace Problems

As a homeowner, you can try a few hacks advised by trained professionals before calling for professional assistance. It will help you save time and service costs and equip you with the necessary knowledge about your furnace.

  1. Always check the thermostat settings after switching on the furnace.
  2. Periodically clean the air filters to ensure there is no obstruction.
  3. Check the main gas valve and gas levels and ensure the gas chamber is sealed.
  4. Find the ‘Reset’ switch below the chamber, and long press the button to restart your furnace.
  5. Schedule annual service maintenance with a professional.

As a homeowner, you can improve the efficiency and longevity of your furnace by scheduling annual service appointments with DVO Heating and Air Conditioning just before the winter season. Our trained professionals will assess each component, service, repair, or replace the necessary components to increase your furnace’s efficiency and effectiveness. It will also prevent sudden breakdowns and costly repairs.


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