HVAC systems that receive regular maintenance last 5-7 years longer than neglected ones and cost 15-20% less to run. Most of the maintenance is simple homeowner work. Here's the full schedule.
Monthly: change or check your air filter
A clogged filter is the number one cause of HVAC inefficiency and breakdowns. 1-inch filters need monthly changes. 4-inch media filters can go 3-6 months. Check by holding the filter up to light -- if you can't see through it, change it. A clean filter costs $10-$25 and prevents hundreds in repair costs.
Seasonally: clean around the outdoor unit
Before cooling season, clear debris, leaves, and grass from around the condenser. Keep at least 2 feet clear on all sides. Gently rinse the coil fins with a garden hose from the inside out. Never use a pressure washer. Bent fins reduce efficiency -- a fin comb ($10) straightens them.
Seasonally: check and clean condensate drain
The condensate drain removes humidity from the cooling process. A clogged drain causes water overflow, mold growth, and system shutdown. Pour a cup of diluted bleach down the drain line annually to prevent algae buildup. If the line has an access port, use a wet-dry vac to clear it.
Annually: schedule professional maintenance
A professional HVAC tune-up ($80-$150/year) includes refrigerant level check, electrical connection tightening, coil cleaning, thermostat calibration, and full system test. This is the single most important thing you can do to prevent breakdowns and extend system life.
Know your system's age and efficiency
If your system is over 12 years old, keep records of every repair. A system that's been repaired twice in three years is approaching end of life. Track your energy bills year-over-year -- a sustained increase signals declining efficiency.
Bottom line
Monthly filter changes and an annual professional tune-up prevent 80% of HVAC breakdowns. Schedule the tune-up in spring (before cooling season) or fall (before heating season) when technicians are less booked.
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