August 4, 2022


It can be incredibly frustrating when your AC is not blowing cold air. Especially during the summer months, when all you want is to cool down your home. So if you’re wondering why your AC isn’t doing its job, you’re not alone. In this blog post, we will discuss some of the most common reasons for this problem.

Thermostat Not In Correct Mode

One possibility is that the thermostat is set to “system off” and “fan on” mode. This means that the fan will run, but the compressor will not turn on. As a result, no cool air will be produced. Make sure your system is set to “cool,” and the fan is in the “auto” position to circulate the air. Or you can set the fan mode to “on” to circulate and filter the air continuously. 

Blocked or Clogged Registers

If the registers are blocked or clogged, air will not be able to flow properly through the system. This can be caused by furniture in front of the vent, a rug moving over the opening, or the louvers or registers being closed. If just one room if particularly warm, check to make sure the supply vent is fully open.

When something is restricting air near the vent itself, only the room with that vent may feel warmer than the rest of the house. That is a good indication there may be an airflow problem in the ducts that supply conditioned air around your home or office. 

Dirty or Clogged Filter

A dirty or clogged filter can also restrict airflow to your AC unit. This is because the filter is designed to catch dirt, dust, and other airborne particles. Over time, these particles can build up and block the air from flowing through. As a result, your AC will not be able to cool your home properly. 

In addition to routine cleaning, the filters should be changed routinely. If you have indoor pets, you may need to change it more often. You should be able to replace indoor air filters easily yourself.  However, if you are unsure of the correct filter to use, HVAC Services can help.

Leaking or Low Refrigerant

One possibility is that there is a refrigerant leak. Refrigerant is what helps the AC to cool the air. If there is a leak, then the AC will not be able to function properly. Another possibility is that the compressor is not working. The compressor is responsible for circulating the refrigerant. If it is not working, the AC will not be able to cool the air.

If you suspect a refrigerant leak, you should contact HVAC Services right away. Unless the leak is large, it can be difficult to diagnose.

Proper Maintenance Prevents AC Not Blowing Cold Air

As with most things in life, proper maintenance is key to preventing problems. This is also true for your air conditioner. By regularly cleaning and maintaining your AC unit, you can help to prevent many common problems, including the AC not blowing cold air.

Some of the things you can do to extend the life of your AC unit include: 

– Clean and replace filters routinely

– Check outdoor coil for blockage or restrictions. Sometimes grass, lint, etc can clog the coil preventing proper heat transfer.

– Inspecting the ductwork for leaks

– Having the unit serviced semi-annually by a professional

A Fan Club subscription from HVAC Services can help keep your unit running smoothly and extend the life of your system. 

By taking these simple steps, you can help to keep your AC unit in good working condition.


We hope this blog post has been helpful in identifying and troubleshooting why your AC is not blowing cold air. Remember to check the thermostat, air filter, vents, breakers and outdoor AC coils. If you’re still having trouble, we recommend contacting us at HVAC Services for assistance. Stay cool!

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