How often does an HVAC system need maintenance?
Twice a year for most systems. Cooling before summer, heating before winter. A heat pump, which runs year round, benefits most from both. Filters are separate and get changed far more often than that, usually every one to three months depending on the filter and whether there are pets in the house.
What a real tune-up includes
Cleaning the coils, checking refrigerant pressures and looking for signs of a leak, testing the capacitor and the contactor, clearing the condensate line and checking its trap, inspecting the blower and the wheel, checking the temperature split across the coil, and testing the safety controls.
On heating, the burners get inspected and cleaned, the flame sensor cleaned, the heat exchanger checked for cracking, and combustion and venting verified.
A visit that only changes the filter and puts a sticker on the unit is not a tune-up.
What it actually prevents
Most emergency calls in the middle of a heatwave or a cold snap are for parts that were showing their age at the last service. Capacitors, contactors, flame sensors and clogged condensate lines all fail predictably and all cost far less to deal with in advance.
A dirty coil also makes the system work harder for less output, which shows up on the bill before it shows up as a breakdown.
What you can do yourself
Change the filter on schedule and write the date on it. Keep the outdoor unit clear of leaves, mulch and shrubs so it can breathe. Pour a little distilled vinegar down the condensate line access in summer if it has one.
Leave refrigerant, gas connections, electrical work and anything involving the heat exchanger to a technician. Refrigerant in particular is federally regulated and requires EPA certification to handle.
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