Why Is My Home AC Blowing Warm Air on a Hot Day?


It’s a hot, July day in the midst of a heatwave unlike we’ve seen in some time here in New England. You close the windows, turn up your central air conditioning and plan to stay in for the weekend just to discover that it’s blowing warm air. What gives?

There are many reasons why your AC unit may be blowing warm air. Some of them are easy to fix, others will require more intensive service. Here are some things to consider regarding your A/C not working.

Your Thermostat is Set Incorrectly

Before you call for a repair appointment, take the time to double-check your thermostat and make sure it isn’t set to “heat.” It may have been set by mistake – someone bumping up against it – by kids pushing buttons or by someone else in the house who likes it warm. In addition, be sure the thermostat isn’t set to “auto” or “on”. If it’s “on,” the fan may be blowing even though the compressor isn’t running, which will result in your AC to blowing warm air out the vents.

There’s a Blockage or Restriction

Another reason why your AC may be blowing out warm air is some type of restriction in airflow, which means the cool air can’t get past to cool your home. A blockage may also be causing the compressor to freeze up, resulting in a malfunction. This could be due to dirty coils or a dirty air filter, or something as odd as an animals’ nest, all of which can be resolved by your professional HVAC service company.

Your Outside Unit isn’t Getting Any Power

While the fan part indoors may be drawing electricity from your home, your outside unit may not be getting any power due to a tripped circuit breaker or other reason. Check your circuit breaker panel to see if this is the case. If the circuit breaker is on but the outside unit still isn’t drawing power, it’s time to call a professional. Do not attempt to fix your outdoor unit’s electrical systems, as this can be dangerous and costly.

You’re Low on Refrigerant

If your outdoor unit is running properly but lacks the necessary refrigerant to cool your home effectively, you’ll need the system topped off.

Choose Arbor Energy

If you’re unsure what the best course of action is for your home’s central AC unit, get a professional opinion as well as thorough maintenance. Regular service to ensure everything is running smoothly can significantly reduce your energy usage and keep your home cooler in the summer.  Call us today at (203) 272-3250 or visit our web site to find out about how you can keep your air conditioning in prime operating condition.