1. Dirty filter
Air conditioner filters should be changed every one to three months. Dirty filters can decrease air quality, lower efficiency and cooling capabilities, and cause the unit to break down sooner than it should.
2. Lack of maintenance
A cooling system is a big investment, and the best way to ensure you get the most life from the unit is to have it inspected and tuned up annually by a certified HVAC technician.
3. The unit doesn’t cool
Many things can impact your air conditioner’s ability to cool properly, including a dirty filter, improper thermostat setting, unit size, and more.
4. Improperly sized unit
An important task when buying a new air conditioner is making sure it’s the right size for your home. An AC that’s too small will run all the time and not be able to cool your home, but a unit that’s too large will cycle too often and increase indoor humidity levels.
5. Refrigerant leak
The air conditioner couldn’t cool without refrigerant, but this can leak if small holes or cracks form in the coil. When there’s a leak, the system won’t have enough refrigerant so that you may notice fluctuating temperatures, a hissing noise coming from the unit, and ice on the coil or refrigerant line.
6. Electrical problems
Air conditioners have important electrical components like capacitors and contactors, and if these are defective or wear out, then it can cause a system failure.
7. Improper installation
Having your unit professionally installed by a certified HVAC technician is crucial. Professional installation will ensure the unit is the right size, is pressure tested, is installed properly, and that it functions optimally for many years.
8. Thermostat problems
A defective thermostat can cause problems with the heating and cooling cycles. Similarly, the wrong thermostat settings can mean your home is never the right temperature, so it’s good to check your thermostat settings, make sure it’s calibrated properly, and ensure outside heat or cold sources are not influencing it.