Your air filter should be replaced or cleaned every one to three months. If you own pets, suffer from allergies, or run your system frequently, monthly replacement is recommended.

Professional maintenance should be scheduled twice annually—in spring for your cooling system and in fall for your heating system.

Air conditioners and heat pumps typically last between 10 and 15 years, while gas furnaces can operate for 15 to 25 years when properly maintained.

Verify that your circuit breaker hasn't tripped, confirm the thermostat batteries are functional, and ensure the power switch at both the indoor and outdoor units is in the on position.

Temperature inconsistencies between rooms typically result from blocked vents, leaking or improperly balanced ductwork, or insufficient insulation rather than equipment malfunction.