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7 Common Causes of Your AC Freezing Up


Having a home that is too cold is not fun, and if your AC starts freezing up, it can be a total nightmare. Such an issue can be incredibly frustrating and inconvenient, not to mention expensive to repair, and it can be challenging to figure out the root cause of your AC freezing. Fortunately, there are several possibilities that could be to blame for your unit not performing as it should.

1. Low Refrigerant Levels

As refrigerants tend to work best at a steady temperature, it can be common for your AC to freeze up when the refrigerant levels drop below optimum. This effect can be due to your unit being damaged in some way or because of low refrigerant levels. In some cases, the problem may come from having too much of an active temperature differential from the surrounding air. Keep in mind that if you do need to have your refrigerant levels checked or fixed, a professional should be the one to do it.

2. Dirty Filter

A dirty filter can be one of the most common factors involved when it comes to a frozen AC. A dirty filter will restrict the amount of air that passes through your system. If you allow your filters to stay too dirty, they could potentially cause an AC to freeze up. A professional should check filters regularly to ensure that your air conditioner is functioning properly. Maintenance is one of the best ways to protect your AC from freezing in winter.

3. Defective Thermostat

A thermostat controls the temperature in a room or home. If it is defective, it could cause your AC to freeze up. There are many different types of thermostats. You can adjust a digital thermostat to different temperatures to modify what temperature your AC needs to blow out. If you have an old-fashioned mechanical thermostat, you will need to turn a screw or two now and then to adjust the temperature that is being blown out. It may be necessary to replace a defective thermostat with one that works properly.

4. Poor Ventilation

If your AC is in a room that does not have excellent ventilation, it could cause the unit to freeze up. If items blocking the vents, such as curtains or furniture, prevent air from coming in, you risk an AC unit freezing up. It can be hazardous over time, especially if it continues to occur. Having your HVAC system checked out by the professionals from Kane Heating And Air Conditioning is always a good idea to ensure everything is running correctly and your air conditioner is not freezing.

5. Old Parts

As your AC ages, the parts inside of it can start to wear down and become obsolete. If an AC is a few years old, it typically needs to be replaced. A major factor contributing to why an older AC might be freezing up is that it has a different efficiency level than newer units. While you may want to keep your old unit running until you can afford a new one, proper maintenance is essential for the unit to last as long as possible.

6. Poorly Insulated Ducts

If your air ducts are older and not insulated, cold air can seep into them. That can cause your AC unit to freeze when cold air comes into contact with it. You can purchase duct insulation at any hardware store, which is very simple for an HVAC professional to install. It is crucial that you keep all of your air ducts well-insulated so you do not have to worry about them freezing during the winter months.

7. Faulty Blower Fan

The blower fan helps to circulate air through your HVAC system and out of the vents in your home. If the blower fan is defective, it may cause air to get stuck in one area, resulting in your AC freezing up. A faulty fan can blow either too hard or not hard enough. If it blows too hard, the cold air blowing through the system could cause your AC to freeze.

If none of these causes seem to be the issue, you may need to have your AC compressor replaced or to install a new air conditioner altogether. To find out what’s wrong with your unit, call us at Kane Heating And Air Conditioning so that we can look at the situation and determine what is causing the freezing up in your home. We service Harker Heights and its surrounding areas. Additionally, at Kane Heating And Air Conditioning, we offer installation, maintenance, and repair services for commercial and residential customers. Our experienced technicians are ready to help with all your HVAC needs.

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