Freeze-Up. When your air conditioner's filter fills with dust and debris, the air flowing through your unit is no longer as clean as it should be. This results in a buildup of dust on the evaporator coil which leads to the coils freezing up.
What happens if your HVAC filter is dirty? A dirty HVAC filter restricts airflow, which can lead to poor system efficiency, increased energy costs, and wear and tear on the unit.
If your AC isn't cooling your space as effectively as it once did, or if the airflow seems weaker, a dirty filter could be the culprit. Cleaning it could bring back your AC's cooling power.
When you leave an AC unit's air filter clogged for too long, you can experience a failure of the entire system. This is because the unit can only work for so long at twice the power before it finally breaks down.
No, you should never run your AC without a filter!
While your HVAC unit will run, it should never run without an air filter. Dirt is the number one cause of air conditioners breaking down, so running your unit without an installed air filters can cause serious damage.
Whether you've confirmed for certain that you have frozen evaporator coils, or you just suspect it, you need to turn off your A/C. Then, your coils should be able to defrost, taking up to 24 hours to thaw out. You can also safely dry out the coils with a hair dryer.
When the filter becomes dirty, this can block airflow and cause the evaporator coil to get too cold, which can lead to a frozen AC unit. As a general rule of thumb, many HVAC professionals recommend replacing the air filter every 90 days.
Many disposable air conditioner filters should be replaced rather than cleaned, as cleaning with water can lead to possible mold issues. Clean the coils and fan of the AC regularly, using a canister of condensed air to blow away dust and buildup.
If not serviced, the AC system can eventually malfunction. A clean filter allows air to circulate freely throughout the system. But if the air filter clogs, the dirt will prevent cold air from flowing through the evaporator (cooling coil).
As a general rule, you should clean your air conditioner filters within the indoor unit every two weeks. In more dusty or polluted environments you should clean your filters more regularly. Cleaning your filters is the most important maintenance task you can do to care for your air conditioner.
First, check your filters and coils for dirt and debris that may be impeding airflow. Once you've cleaned the filters and coils, run the air conditioner with just the fan so that the ice accumulation can melt off. If the AC still doesn't blow cold air, it could be that refrigerant levels are too low.
While there are a number of commercially available coil cleaning solutions on the market, air conditioner coils can be cleaned with a solution of a mild household detergent and water. The detergent and water mix is applied to the coil using a low-pressure sprayer.
1st Step: Turn Your HVAC Unit Off.
Even if it's sweltering outside, you still need to turn OFF your air conditioner! Running a frozen air conditioner will wear out parts much faster, and could overheat your unit. Worn parts are bad news for the most expensive piece of your HVAC unit—the compressor.
Clogged filters will not properly filter debris from entering the system, damaging internal components. They also cause accelerated wear and tear of parts such as the blower motor, fans, and compressor.
How Often Do I Need to Change Out My Air Filter? Generally, most air filter manufacturers and HVAC companies recommend changing your air filter every 90 days, or 3 months. That can change based on where your home is located (ex. dusty, dry climates), if you have any pets, and the age of your system and equipment.
Then, change the fan setting from 'auto' to 'on. ' The fan will slowly defrost the system. Once your air conditioner is ice-free, you can turn it back on and reset the fan to auto (This may take an hour or more).
Turn the Thermostat Fan Setting to On. Turn your thermostat fan setting to “On” so that the fan continues to blow air over the coil. The warm air in the home will naturally defrost the frozen coil. In severe cases, the heat can be turned on to speed up the process.
To defrost your HVAC unit, you want to begin by turning off your thermostat and turning your fan on. Let the fan run over the next few hours to allow your unit to defrost.