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Repairs first, because most calls are repairs. Then the attic, which is where the comfort problems in this town actually live.
Cheapest cause first, and you see the reading
A no-cooling call in September is not the moment to be sold a system. The first things we check cost very little to put right: a run capacitor, a contactor with burnt points, a float switch that has done its job because the drain is blocked, a filter nobody has changed, a thermostat that lost its programme, a breaker.
If it does turn out to be the compressor, you get the measurement that says so and a repair-or-replace conversation with real numbers on both sides — including the ones that favour repair.
The attic
Why it decides everything
Almost every house in north Orange County built between the mid-fifties and the mid-seventies runs its ductwork, and often its furnace and coil, through an attic that reaches well over 130°F on a September afternoon. Air travels through that space on its way to you.
A leak on the supply side is air conditioning the roof. A leak on the return side is pulling that 130-degree air straight into the system, every minute it runs. Neither is visible, neither makes a noise, and both look exactly like a system that is too small.
So we measure it
Static pressure across the system and a duct leakage test, not a torch and an opinion. The same test the energy code asks for on most change-outs is the test that tells you whether your existing system was ever going to work.
A house that has never cooled properly since it was built is very often a duct problem that has been diagnosed as a capacity problem for thirty years, and the fix is a fraction of a replacement.
Six other things
Annual service
Charge verified by superheat and subcooling, coil and drain cleaned, combustion tested on gas heat, and the figures recorded rather than described.
The room that never keeps up
A damper, a crushed flex run, a missing return, or a room that was added without anybody adding duct to it. We find out which before proposing anything.
Condensate
Primary drain, secondary pan and float switch, tested. With a coil above a ceiling this is the cheapest insurance in the house and the most commonly missing.
Heat pump conversions
Replacing gas heat with a heat pump changes the electrical load and sometimes the panel. We check the panel and the ductwork before quoting, not after.
Older wall and floor furnaces
Still common in this part of the county. We will service them honestly and tell you plainly when one has reached the point where replacement is the right answer.
Replacement
Sized from the house, permitted and tested, with all three visible on the quote — and the rebate question raised before the work rather than after it.
Things worth hearing early
Bigger is not safer
An oversized system cools the thermostat quickly and stops, so it never runs long enough to take moisture out. In a coastal county that leaves you with a house that is cold and still feels heavy, plus a compressor starting and stopping all day.
A dusty house is usually a filter path
Not the grade — the path. If the cabinet does not seal round the filter, or the return draws attic air through a gap at the plenum, then most of the air is going around whatever you fitted.
Condenser-only swaps are rarely simple
Changing the outdoor unit and leaving the indoor coil is the classic short cut. The coil has to match, the refrigerant has to match, and the line set has to be dealt with properly. It can be the right answer. It is never the half-hour job it is sold as.