HVAC Contractors: Top Reasons For A Frozen Air Conditioner

HVAC contractors

Freezing of the air conditioner is one of the most common problems you will come across as a homeowner. The easiest way of telling that your air conditioner has iced up is placing your hand over the supply register. When you feel minimal airflow, your unit has definitely frozen. HVAC contractors report that there are many reasons why your air conditioner can freeze up. Some of these reasons include:

Restricted air flow

When you place your unit close to furniture, the furniture prevents effective airflow thus your unit is at the risk of freezing up. Another thing that restricts airflow is dirty air filters. Due to the dirty air filter, insufficient air reaches the evaporator coil for cooling. Since the coil is still working optimally, it ends up freezing up. To avoid restricting airflow you should place your unit a distance from the furniture and other units that might prevent effective airflow. You should also consider cleaning the air filters at least once every month.

Lowering the temperature too much

The air conditioner is designed to work at 20 degrees centigrade. When it’s too hot, most homeowners lower the temperature too low so that the house can cool faster. Unfortunately, things don’t work like this. Doing this not only puts your unit at the risk of freezing up, it also results to the overworking of the air conditioner thus you end up paying a lot of money on your energy bill then you should. AC repair professionals also observe that doing so also puts your unit at the risk of breaking down.

The best way of fixing this problem is avoiding lowering the temperature too much. Remember that there is no way that your unit will work faster just by lowering the thermostat settings.

Low Freon levels

Freon levels get low when there is a leak or the refrigerant was incorrectly charged during installation. When the levels are too low, the evaporator coil tends to get too cold. When you are having this problem you should call an HVAC contractor to identify the leakage and fix it. The professional should then recharge the system according to the instructions given by the manufacturer.


These are some of the reasons why your air conditioner is freezing up. When you are experiencing a freeze up you should shut off the AC in order to avoid damaging the compressor. If you have the skills, you can identify the cause of the freezing or hire an HVAC company to help you out.

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