Takes about a minute. No obligation.
A unit that looks fine and blows cool air can still be running on a low charge. The gauges catch it before the compressor takes the damage, because by the time airflow at the vents feels weak, the compressor has usually been straining for a while.
The capacitor that kicks the compressor and fan on can test weak long before it fails outright. A tech checks it against its rating. Catching it during a tune-up means a scheduled fix instead of a dead system on the hottest day of the month.
NOAA nClimDiv, 1991–2020 normals
A dirty filter chokes airflow before anything else in the system fails.
Coils and the drain line only stay clean if the filter upstream is doing its job.
Half the homes in Tom Green County were built in 1980 or later, so a lot of the AC systems here haven't put in the years you'd see elsewhere. That's worth something, but only if the system gets looked at while it's still in good shape. A yearly check on a newer unit catches the small stuff, a capacitor testing weak, a refrigerant charge drifting low, before it turns into a bigger repair. Systems that get skipped year after year don't fail any less often just because the house is new. The age of the house buys you a head start. A yearly check is what keeps you from losing it.
A neglected system uses more power, and power costs more here. A tune-up pays for itself.
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Seven months of cooling here, April through October, with afternoon highs averaging 95 in June, July and August. That's a long season of hard running, not a few weeks of it. The outdoor unit takes a beating too. Tom Green County has seen 171 hail events and a matching number of damaging wind events over the past decade, and that cabinet and coil sit outside through all of it. A capacitor or contactor that would hold up fine somewhere milder wears thinner here, faster. Better to find that out during a check than when the system won't start in July.
A system that shuts off a few minutes after starting, then kicks back on again and again, is struggling with something. Could be a dirty coil, a stuck thermostat signal, low refrigerant. Every one of those starts puts load on the compressor. A tech can trace short cycling to its cause before the compressor itself takes the hit.
Air that used to feel cold and now just feels like air is a sign the system is moving air without actually cooling it. A failing compressor can do that. So can a blocked coil, or refrigerant that has dropped. Whatever it is, it did not happen overnight, and a maintenance visit catches it while the fix is still small.
A tune-up checks the refrigerant charge, cleans the coils, tests the capacitor and tightens the electrical connections.
A real tune-up starts outside, with the condenser coil. Dirt and grass clippings pack into those fins and choke the airflow the system needs to dump heat, so a tech washes the coil out, not just hoses off the cabinet top. Inside, they check the suction line temperature against the pressure on the gauges, because that's what tells you the refrigerant charge is right, not just whether the air feels cold. The contactor gets a look too, since the points on it pit and burn with every start and stop over the years. Condensate drain gets flushed, because a clogged one backs up and shuts the system down on its own. Electrical connections get tightened, since a loose one runs hot and eventually fails right there at the terminal. None of this is guesswork. Every reading gets checked against what the system is supposed to be doing, not just whether it's running.
