Why Your Air Conditioner's Coils May Freeze


Your AC will not be able to cool your house effectively if its coils freeze. Frozen coils also increase the risk of AC damage. Knowing why the coils might freeze may help you avoid the issue. Below are some of the reasons AC coils sometimes freeze.

Clogged Filters

Good airflow is central to efficient AC operations. The cool air needs to move throughout the house, and the warm air needs to move to the AC for cooling. The warm air also keeps the coils at reasonably high temperatures to prevent freezing. If the airflow is hampered, the coil will stay cold and may freeze if the problem continues for an extended period.

Clogged Coils

Dirty or clogged AC coils can also cause freezing because the accumulated debris acts as an insulator over the coils. The insulation prevents the warm air blowing over the coils from heating up the coils. The dirtier the coils are, the higher the risk that the insulation will cause freezing.

Low Refrigerant

The refrigerant absorbs heat in the house and dumps it outside. If the refrigerant level falls, say due to a leakage in the refrigerant lines, the remaining volume of refrigerant might not absorb adequate heat in the house. Since the refrigerant also flows within the coils, the heated refrigerant also keeps the coils warm. This means low refrigerant will leave the coils cold and encourage the risk of freezing.

Fan Malfunction

Anything that interferes with air circulation in the AC increases the risk of frozen coils. The AC has a motor that operates a fan that aids air circulation. If the fan is not working, the air won't flow as usual, and the coils may freeze. Several issues can cause AC fan malfunction; for example, the AC fan may fail to run if the motor is fried up, the fan belt is damaged, or something has caused physical damage to the fan blades.

Blocked Condensate Drains

The AC cools the house both by lowering the temperature and by pulling moisture out of the air. The moisture usually condenses and flows out of the AC via the condensate drain lines. This means the condensed moisture won't flow out if the lines are damaged and clogged. The more the water stays in the AC, the more time it has to freeze.

Thermostat Problems

Lastly, thermostat problems may also cause your AC coils to freeze. A malfunction with the thermostat may interfere with the settings or prevent accurate reading and transmission of temperature data to the AC's mainboard. As a result, the AC may run at lower temperatures than you need, causing the coils to freeze.

Hopefully, you will be able to keep your AC coils ice-free. If the coils keep freezing, contact an AC repair technician to get to the root of the problem and solve it once and for all.


12 July 2019

Inspecting Your Air Ducts

Last summer, I began to get extremely hot in my home. My air conditioning system couldn’t adequately keep my home cool anymore. Therefore, I contacted an experienced HVAC contractor. This individual visited my home and thoroughly inspected my unit. If your air conditioner isn’t working like it once did, your air ducts may be clogged up. Thankfully, an expert HVAC contractor can determine if faulty air ducts are the cause of the hot temperatures inside your home. On this blog, you will discover how an HVAC contractor can properly inspect your air ducts. Stay cool and comfortable during the hot summer months!