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Check your thermostat setting and make sure the fan is set to “Auto” and not “On.” If the setting is correct and the fan still runs continuously, you should call for service.


You should first make sure that there is power to the outside unit. Go outside and listen for a humming noise. If you hear no noise, you probably have no power to the unit.

Check the power disconnect outside at the unit (flip breaker off/on or reset fuse), then check the breaker inside. Ensure thermostat wires haven’t been damaged. If the problem persists, call for service.


During cooling season: 76–78°F. During heating season: 68–72°F. Any setting works, but deviations may affect your energy bills.


HCFC refrigerants like R22 are being phased out due to environmental concerns. New systems and refrigerants are being developed to comply with regulations and protect the ozone layer.


  • SEER: Efficiency of cooling equipment; higher = lower costs.
  • HSPF: Efficiency of heating portion of heat pump.
  • dB: Sound level; AC and heat pumps usually between 70–88 dB.


  • Disposable filters: Collect large particles; limited capacity; replace 1–2 months.
  • Reusable foam/metal filters: Washable, recoatable; effective for large particles.
  • Electrostatic filters: Electrically charged to attract particles.
  • Pleated filters: Dense fibers arranged in V-forms for higher capacity.
  • HEPA filters: Remove 90%+ of small particles; portable units available.
  • Electronic Air Cleaners: Use electrical charge to capture particles on metal plates; plates must be cleaned periodically.


Replacement depends on run time, filter type, and efficiency. Low-efficiency disposable or permanent filters: 1–2 months during peak seasons.


Regular maintenance prevents unexpected breakdowns, extends equipment life, and ensures safe, efficient operation. Carbon monoxide risks are reduced with proper inspections.


Proper sizing ensures comfort, efficiency, and low operating costs. Consider insulation, windows, ductwork, air leakage, and home orientation. Avoid relying on rough “square footage” rules alone; use Manual J or approved load calculations for accuracy.