Imagine it’s the first chilly day after a long, hot summer and you turn your furnace on for the first time in months to warm your home, only to find it blowing cold air. The time you had allotted to curl up on the couch and relax on the cool Texas day is is now being spent trying to figure out why your furnace isn’t working, what a bummer! 

We at Ratterree Heat & Air know it’s times like those when people wish they would have checked their furnace before the cold days settled in the Dallas and Fort Worth area. While it can be confusing and frustrating to deal with a furnace that isn’t operating properly, there are steps you can take to have your heat back on and enjoy the warmth of your own home once again. In this blog, we will explain why your furnace blows cold air and how to get it working properly. 

For HVAC questions and services, contact us at Ratterree Heat & Air today

What’s The Cause? 

There are a few reasons why your furnace would be blowing out cold air. Here are some things to check prior to calling a heating contractor to assess the situation: 

  1. The Thermostat – While it may seem like an obvious culprit, the thermostat is a commonly overlooked tool when it comes to HVAC issues. If you’ve been blasting your air conditioning all summer long in your Dallas/Fort Worth home to keep cool from the blazing heat, there is a chance that you haven’t switched the temperature on your thermostat to accommodate the colder temperatures. Be sure your thermostat is programmed to the desired temperature and switched to the “heat” option. 
  2. Air Filter – In some cases, your furnace will overheat, causing it to blow cold air. Overheating is generally attributed to restricted airflow, often caused by an air filter that needs to be cleaned or replaced. If the air filter accumulates build-up, it causes the furnace to run longer and harder to provide heat, causing it to overheat. If a dirty air filter is the reason for the furnace overheating, replace it with a new air filter and your furnace will likely begin to work properly. If you need assistance with replacing your air filter, call Ratterree Heat & Air to get the job done! 
  3. Pilot Light – If you’ve checked the thermostat and the air filter and still haven’t found the problem, it’s time to take a closer look at your furnace. Take a look at the ignition system and see if your heater is lighting the fuel. If it isn’t heating the fuel, then it will not be able to heat your home. If you discover the pilot light is out, don’t fret. Check your owner’s manual for how to ignite your model’s light. Relight the pilot light and wait several minutes. If the flame stays lit, you have fixed your problem! However, if the light goes out after a matter of minutes, you may have a thermocouple-related problem, meaning your unit may need to be repaired or replaced. If you find yourself at this point, it is recommended to call in an expert, like Ratterree Heat & Air, to assess and fix the issue. 
  4. Gas Supply – Furnaces have specific features built in for security purposes. If the unit detects a threat to its operating ability, it can lock down to reduce risk. One of the reasons your furnace would lock itself is if it’s not getting the amount of gas required to provide warm air. If this is the case, check to make sure your gas supply is on. If it is on but still isn’t supplying adequate gas, you might have a severed line. We highly recommend calling in a professional to take care of this issue for safety reasons. 
  5. Clogged Condensate Drain Lines – Newer, high-efficiency furnaces have condensate drain lines that are programmed to remove the water that is created from the heating process. When those lines get clogged, a switch will be activated to prevent the burners from lighting. If you are experiencing this issue and need assistance cleaning the drain lines, give us at Ratterree Heat & Air a call. We’re happy to help! 

How Ratterree Heat & Air Can Help 

If you have worked your way down this list and still haven’t been able to find the source of the cold air blowing into your house, don’t panic. Our expert staff at Ratterree Heat & Air are highly-trained in assessing all models of heating furnaces and can easily diagnose the issue and provide you with a solution. If this problem is occurring at an inconvenient time, which seems like that’s always the case, reach out to our team. We are open every day of the week and even offer emergency services to ensure you and your family are able to reside comfortably in your home in a timely manner.