Air Conditioning Questions

Common causes include: dirty air filter restricting airflow, low refrigerant from leaks, dirty condenser coils, frozen evaporator coils, thermostat issues, or compressor problems. Start by checking and replacing your filter, then call a professional if the problem persists.

Replace standard 1-inch filters every 30-90 days. Homes with pets, allergies, or high dust may need monthly changes. Higher-quality 4-inch filters can last 6-12 months. Check your filter monthly—if it looks dirty, replace it regardless of time passed.

AC sizing depends on square footage, ceiling height, insulation, windows, climate zone, and more. Rough estimates suggest 20 BTU per square foot, but proper sizing requires a Manual J load calculation. An oversized AC wastes energy and causes humidity problems; undersized units can't keep up.

Different noises indicate different problems: squealing may mean belt issues, grinding suggests motor bearing failure, clicking could be electrical problems, buzzing might indicate loose parts or refrigerant issues, and banging could mean a loose component. Turn off the system and call for service if noises are severe.

A well-maintained central air conditioner typically lasts 15-20 years. Factors affecting lifespan include maintenance frequency, usage patterns, local climate, installation quality, and brand. Regular tune-ups, filter changes, and addressing repairs promptly can extend your AC's life.

AC units freeze when airflow is restricted or refrigerant is low. Common causes include dirty filters, blocked return vents, dirty evaporator coils, low refrigerant from leaks, or blower motor issues. Turn off the system to thaw, check filters and vents, and call a professional if it refreezes.

SEER (Seasonal Energy Efficiency Ratio) measures AC cooling efficiency. Higher SEER means lower operating costs. Minimum SEER is currently 14-15 depending on region. High-efficiency units range from 16-26+ SEER. A 16 SEER unit uses about 13% less energy than a 14 SEER unit.