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A dirty coil or a low refrigerant charge makes the compressor work harder to cool the same house. That shows up on the bill before it shows up as a breakdown. Texas homes paid about 14.94 cents per kilowatt-hour in 2024, and an AC that runs inefficiently all summer burns through more of those kilowatt-hours every single day it runs. A tune-up catches the dirty coil, the weak capacitor, the low charge, before it costs you all season. The system runs the same hours either way. What changes is how much power it takes to do it.
NOAA nClimDiv, 1991–2020 normals
Your AC starts running in May here.
Have it checked in April, before it has to run hard for six months straight.
Between visits, check the filter and change it when it looks gray or clogged. A dirty filter chokes airflow across the coil, and that's one of the few failures you can head off yourself. Keep the outdoor unit clear of grass clippings, leaves, and anything growing into the fan cage. Walk past the indoor unit now and then and look for water pooling underneath it, which usually means the condensate drain is clogged. If you catch that early, it's a wet-vac job. If you don't, it can shut the system down or damage the pan underneath. Past that, leave the panels closed and the refrigerant alone. Opening the cabinet or touching the lines without training risks the coil, the compressor, or you.
A dirty coil or a weak capacitor makes your AC pull more kilowatt-hours to do the same job. At 14.94 cents each, that difference shows up on your bill before the system ever breaks down. A tune-up catches it while it's still cheap to fix.
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If your system came with the house, it's likely one of the newer ones, built in 2002 or later. A yearly check on a system that age is doing real work. It catches a capacitor that's starting to weaken or a coil that's starting to clog while both are still easy to fix. That's a different visit than the one a system gets after years of running unchecked.
A system low on refrigerant can still blow cold air at the vent and feel fine to stand under. The only way to know the charge is right is to connect gauges to the lines and measure the pressure. Run it low for long enough and the compressor wears out carrying a load it wasn't built for.
The capacitor gives the compressor and fan motor the jolt they need to start. It weakens slowly, with no sign from the thermostat or the airflow, until the day it can't deliver that jolt and the unit won't start at all. A meter reading during a tune-up catches it while it's still working, not after it quits.
A tune-up checks the refrigerant charge, cleans the coils, tests the capacitor and tightens the electrical connections.
A tune-up is a set list, not a glance at the unit. The tech checks refrigerant pressure with gauges on the lines, because that's the only way to know the charge is right. The capacitor gets tested under load, since a weak one can still start the system on a cool morning and fail by afternoon. The condenser coil gets washed clean, not just looked at, because dirt packed between the fins blocks the heat the system is trying to get rid of. Electrical connections get tightened, since a loose one heats up and burns before anyone notices. The blower wheel gets checked for dust buildup, and the condensate drain gets cleared so it isn't the thing that shuts the system down later. None of that shows up on the thermostat. It shows up later, in whether the part failed or just got old.
