Why Is My AC Unit Not Blowing Cold Air?

AC OutWhen your central air conditioning system stops blowing cold air, troubleshoot for basic problems, but know when to bring in Bunn’s & Bennett Heating & Air Conditioning professionals!

Basic Troubleshooting Problems

Your air conditioner’s cycle is controlled by the setting on the thermostat. If your air conditioner is running but no cool air is exiting the vents, the blower may be the problem or the air conditioner may be dirty. Air conditioner units require cleaning every spring. Regular cleaning prevents clogged filters and condensers, which may obstruct cool air from entering your home.


The thermostat may be the problem if the AC fan is blowing, but there is no cold air exiting the vents. Make sure that your thermostat is set for cooling, and the fan is set to “Auto”. This will enable the fan to turn on when the cooling cycle turns on. If the fan comes on, but no cold air comes out, then the thermostat is not triggering the cooling cycle properly. The thermostat is either faulty or the wiring has been completed incorrectly.

AC Coils

Sometimes the coils within the AC unit are to blame. The evaporator coils are located on the inside unit where the duct work connects to the AC system. The condenser coils are on the outside unit. The sets of AC coils will be protected by a grill or panel, which can be removed using a screwdriver. The AC’s aluminum fins need to be straight and kept clean. Remove dirt and debris with a wire brush, along with a foaming AC coil cleaner.


AC units use a refrigerant, to cool the air. Leaks or excess refrigerant can impede the system’s performance. Frequents starts and stops of the AC unit is often a sign of a refrigerant leak. Frost on the unit’s evaporator fans on the inside unit is a sign of a refrigerant problem. Contact Bunn’s & Bennett Heating & Air Conditioning and a certified contractor will come and repair the unit and replace the refrigerant.

Drain Pans

AC units are equipped with drain pains that are located underneath the AC coils. The drain pans catch condensation from the unit. It is important to routinely check the drain pan’s piping to ensure it is free of debris that may cause a blockage. If a blockage occurs, the AC system will not operate efficiently. Check the drain pans for overflow, and make sure there are no blockages.

Bunn’s & Bennett Heating & Air Conditioning

If these suggestions did not solve your problem, or you’d simply prefer a professional take a look at your system, call Bunn’s & Bennett Heating & Air Conditioning. We are a licensed HVAC dealer serving the Huntsville-Madison (AL) and Tennessee Valley area. We are available 24/7/365 for any and all of your HVAC needs. Let us cool your Bunns!

Keep up with us!


More Posts

Home Decorating Ideas to Improve Your Indoor Air Quality

Home Decorating Ideas to Improve Your Indoor Air Quality

Creating a healthy home environment is as much about the air we breathe as it is about aesthetic appeal. With increasing concerns over indoor air pollution, homeowners are looking for ways to combine home decor with air quality improvement strategies. Here are some decorating ideas that can help you breathe easier while keeping your living space stylish and inviting.

Why Choose a Mini-Split System for Your Home? | Benefits Explained

Why a Mini-Split System Might Be the Right Choice for You

Discover the advantages of mini-split systems for heating and cooling your home. Learn about customizable climate control, energy efficiency, easy installation, quiet operation, improved air quality, versatility in design, and cost-effectiveness.

Send Us A Message

Schedule Service
or a consultation

It's as easy as filling out this short form!

Or, call us anytime at 256-536-0967

Be comfortable!

fan favicon