What San Antonio's Record 2023 Summer Taught Us About AC Failures

The short version: 2023 showed that when San Antonio heat stops taking breaks, air conditioners fail in a predictable order, capacitors first, then overworked compressors and heat-choked coils, and the systems that sailed through were overwhelmingly the ones that got spring maintenance and clean airflow.

The numbers behind that summer were not normal. Per National Weather Service data reported by Texas Public Radio, San Antonio recorded 75 days at or above 100 degrees in 2023, the most in the city’s record book, blowing past the previous mark of 59 days set in 2009. The same season produced a record 23 consecutive triple-digit days from July 30 to August 21. In a typical year, average summer highs here sit in the mid-90s, hot but survivable for equipment. In 2023, systems ran flat out for weeks with no recovery time.

Failure number one: capacitors

The run capacitor lives in the outdoor condenser cabinet, which bakes well above air temperature on a sunny afternoon. Heat degrades the electrolyte inside a capacitor, and degradation compounds when the unit never gets cool evenings to recover. That is why long heat waves produce waves of capacitor calls: the outdoor unit hums but will not start, or the system runs briefly and quits.

The silver lining is cost. Capacitor work sits at the affordable end of AC repair, and it is usually a single-visit fix once diagnosed.

Failure number two: compressors pushed years ahead of schedule

Every hour of runtime is wear on the compressor, and a summer like 2023 crammed a huge share of extra hours into one season. A compressor that fails is the expensive scenario: HomeAdvisor’s 2025 cost data puts replacement at 800 to 2,300 dollars for most homeowners. That is the repair that forces the repair-or-replace conversation, especially on a system already past its tenth birthday.

Sustained heat gets compressors two ways. Runtime piles up, and high head pressure from a hot, dirty condenser coil makes every one of those hours harder than it should be.

Failure number three: coils that cannot breathe

San Antonio sits on the edge of the Hill Country, and the fine limestone dust that blows off caliche lots and construction sites settles onto condenser coils like a blanket. Add live oak leaves, catkins, and pollen packed into the fins, and the coil that is supposed to dump heat into the outside air ends up insulated instead. The system compensates by running hotter and longer, which feeds back into the capacitor and compressor problems above, and it shows up on the CPS Energy bill too.

What actually protected systems

Three habits separated the systems that made it through 2023 from the ones that did not:

1. A spring tune-up. ENERGY STAR’s maintenance checklist recommends a yearly professional tune-up of the cooling system, scheduled in spring, covering refrigerant charge, electrical connections, and coil condition. Spring is when a weak capacitor gets caught on a bench meter instead of at 4 p.m. on a 103-degree Friday.
2. Clean filters, checked monthly. ENERGY STAR guidance is to inspect the filter monthly and change it at least every three months. During a dusty San Antonio summer, monthly is not overkill.
3. A clear, rinsed condenser. Keep about two feet of clearance around the outdoor unit and rinse dust and oak debris off the coil. It is a ten-minute garden-hose job that directly lowers the temperature every component in that cabinet lives at.

Plan for the next one

Nobody can promise a repeat of 2023, but the record now exists, and equipment does not care about averages during the weeks that break them. If your system limped through last summer, or if you have not had eyes on it since the heat broke, get it checked before the first triple-digit stretch instead of during one. Request a visit from a local technician and go into summer with a system that has already been looked over.