If your A/C is low on refrigerant, there will be low airflow from registers, you will see high electrical usage, and your home will take longer than normal to cool. That’s when you need a certified A/C professional to add refrigerant to your unit.
Air filters block dust, pollen, and other small particles from entering your home. These air filters eventually become clogged, causing a reduction in energy efficiency from 5 to 15 percent, according to the U.S. Department of Energy, which recommends changing your filter every 1-2 months, for cleaner air and more efficient A/C usage.
Evaporator and condenser coils collect dirt over time, which limits air flow and the amount of heat removed by the air conditioner. Cleaning these will allow better air flow and A/C efficiency.