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Why Does an Air Conditioner Blow Hot Air?

Don’s Electric & Plumbing Inc. is an HVAC company known for its reliable services, with a reliable, professional line specializing in AC service and AC installation in Cobleskill, NY.

There are quite a few reasons which might make your air conditioner blow hot air. They are listed here:

Dirty Air Filters


Since the filters in the AC are responsible for collecting all the dust and debris, they form a top layer on it. When this happens, it will stop the cold air circulating in your house. When left uncleaned, it puts immense pressure on the unit to work harder and harder, eventually leading to system malfunction.



The condenser unit is the HVAC part that’s placed outside the house. Any trouble in the condenser coil or the unit results in the machine blowing hot air. The condenser makes a little noise while it’s working. So not being able to listen to any sound is a sign that the condenser unit has some issue.



The coolant or refrigerant is the liquid responsible for the cold air blowing out your air conditioner. Whenever there’s a leak, maybe because of cracks or corrosion in the coils or for some unknown reason, your air conditioner will blow hot air.

Dirty Evaporator Coil


The evaporator coils are responsible for cooling your house down by absorbing all the heat and circulating with cold air instead. Like any other part of your air conditioner, with usage over time, they catch dust and debris. If not cleaned regularly, it will interrupt the AC’s efficiency by blowing cold air.

You can clean your evaporator coils by yourself if you are careful with the equipment and follow the required protocol but remember it’s best to leave it to a professional.



The air conditioner depends on the refrigerant to produce cold air. The compressor plays a vital role in converting the refrigerant’s state, which ensures the production of cold air. The procedure also suffers whenever a compressor malfunction, making the device blow hot air.

Refrigerant Leaks


The refrigerant is present in a gaseous state under pressure to produce cool air. Whenever there’s corrosion in the coils or cracks in the equipment, the refrigerant leaks out of place. This makes the device blow hot air instead of cold air.

Duct Leaks


If the ductwork in your house has any cracks, tiny or big, it can allow warm air to enter. These ducts are responsible for the distribution of cold air throughout the house. When warm air enters these ducts, the air coming out of the vents is warm or hot.



Thermostat malfunctioning is most probably the silent of all the problems. Before figuring out that the thermostat is the culprit, you might be a while. When the thermostat malfunctions, it sends mixed signals to the unit and causes it to blow hot air.

If you live in Cobleskill, NY, and require any HVAC services, please reach out to us by either visiting our website or calling us here.