Follow these practices for maximum system lifespan:
Monthly tasks:
Change/clean air filters (1-inch monthly, 4-inch quarterly)
Clear debris around outdoor unit
Check thermostat operation
Seasonal tasks:
Professional maintenance twice yearly (spring and fall)
Inspect ductwork for visible issues
Clean return air grills
Verify proper airflow from all vents
System operation:
Don't set thermostat below 68°F (AC) or above 72°F (heat)
Use programmable thermostat for consistent temperature
Don't block supply or return vents with furniture
Keep interior doors open for proper air circulation
Don't close vents in unused rooms (creates pressure problems)
Equipment care:
Avoid "short cycling" (turning system on/off repeatedly)
Give system 5 minutes between cycles
Address small issues promptly before they cascade
Keep vegetation 2+ feet from outdoor unit
Proper care extends typical 12-15 year lifespan to 18-20 years, saving thousands in replacement costs.