Air Conditioning Repair in Houston, TX
Houston asks more of an air conditioner than almost anywhere in the country. Here is what fails, in what order, what to check before you pay for a visit, and the questions that separate a real diagnostic from a guess.
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What breaks in a Houston summer, and in what order
Houston runs air conditioning close to nine months a year, much of it against outdoor temperatures in the nineties with humidity to match. That is a duty cycle most of the country never asks of a system, and it produces a fairly predictable order of failure.
| Failure | What you notice | Rough severity |
|---|---|---|
| Capacitor | Outdoor fan will not start, or hums and stops | Small. Common. Often same-day |
| Clogged condensate drain | Water around the indoor unit, or the system shuts itself off | Small, but ignore it and you get ceiling damage |
| Low refrigerant | Running constantly, air not properly cold, ice on the lines | Moderate — and it means a leak, which has to be found |
| Contactor or relay | Nothing happens outside when the thermostat calls | Small |
| Blower motor | Weak airflow at the vents | Moderate |
| Compressor | Breaker trips, loud start, no cooling at all | Major. This is where repair-versus-replace gets real |
The first four are the bulk of calls. A capacitor is a part that costs very little and fails routinely in this heat — if you are being quoted a large sum for one, get a second opinion.
Before you call, check three things
Not to save the visit — to make sure the visit is worth paying for.
- The breaker. Air handlers and condensers are usually on separate breakers. A tripped one is free to reset. If it trips again immediately, stop and call — that is a fault, not a nuisance trip.
- The filter. A blocked filter chokes airflow, and choked airflow freezes the coil, which stops cooling entirely. In Houston a filter lasts a month or two in summer, not the three the box claims.
- The float switch. Many Houston systems have a safety switch that cuts power when the drain pan fills. If your system has simply stopped with no other symptom, a full pan is a common cause.
If the coil is frozen, turn the system to Off and the fan to On. That thaws it over a few hours without the heat gun some people reach for. Running it frozen risks the compressor, which is the expensive part.
What a repair visit should involve
A diagnostic is not a guess. It should include measuring the temperature split across the coil, checking refrigerant pressures against the system's rated charge, testing the capacitor under load rather than by eye, and inspecting the drain.
Ask what the reading was, not just what the verdict is. A technician who measured something can tell you the number. One who did not will change the subject.
Repair or replace
The old rule of thumb was to replace once a repair costs more than a third of a new system. That rule has been complicated by the refrigerant change, and it is now worth more than a rule of thumb — the arithmetic is on the repair cost page.
The short version: if your system uses R-410A, is over about twelve years old, and needs a compressor or a major refrigerant repair, the sums have shifted toward replacement in a way they had not three years ago.
What to ask any company you call
- Is the diagnostic fee credited against the repair? Many credit it, some do not.
- Are you licensed in Texas? HVAC contractors are licensed by the state. Ask for the number.
- What did you measure? Pressures, temperature split, capacitor reading under load.
- Is the part warranted, and for how long?
- If refrigerant is low, where is the leak? Refrigerant does not get used up. If it is low, it went somewhere, and topping it up without finding the leak means paying twice.