Recommended energy-saving settings are 78 F in the summer and 68 F in the winter.

Unusual noises may indicate failing motor bearings, loose parts, or issues with the fan.

SEER (Seasonal Energy Efficiency Ratio) measures efficiency; a higher number means greater energy efficiency. Modern systems usually start around 14-16.

Check them monthly; replace 1-inch filters every 1–2 months, and thicker media filters every 6–12 months.

It is recommended to have a professional tune-up twice a year (one for cooling, one for heating) to ensure safety and efficiency.

A frozen coil is usually caused by restricted airflow (dirty filter/blocked vents) or low refrigerant levels. Turn off the AC and run the fan to thaw.

Replace dirty filters, keep blinds closed to block sun, seal air leaks around the home, and install a programmable or smart thermostat.

If the system is over 10–15 years old, requires frequent repairs, or energy bills are rising, replacement is usually more cost-effective than repairs.