Your Houston AC, kept alive longer.
In most of the country the air conditioner is a summer appliance. Here it’s the hardest-working system in your home, running the better part of the year. A little routine care buys you years of life and lower bills — here’s what actually matters.
Ask any Houston homeowner what they’d least like to fail in August and the answer is unanimous: the AC. Our climate runs cooling systems harder and longer than almost anywhere in the country, which means two things — maintenance matters more here, and neglect costs more here. The good news is that keeping your system healthy comes down to a few simple habits and one annual appointment.
Your AC works harder here than almost anywhere
A Houston air conditioner can run the better part of eight or nine months a year, fighting both heat and humidity. That’s far more run-time than a system in a four-season climate, and it’s why our equipment tends to wear out toward the shorter end of its expected life. Everything below is about offsetting that — getting full value out of a system that’s working overtime.
Change the filter — the cheapest thing that matters
If you do nothing else, do this. A dirty filter chokes airflow, forces the system to work harder, drives up your bill, and shortens the unit’s life. For a standard 1-inch filter, plan on every 1–2 months, and check it monthly in peak season — thick 4–5 inch media filters stretch to several months. Pets and dust shorten the interval. Tape the filter size inside the closet door so you’re never guessing at the store.
Service it every spring
Book a professional tune-up before summer hits, ideally in spring. A good technician checks refrigerant charge, cleans the coils, tests the capacitor and electrical connections, and clears the condensate drain (a clogged drain line is a classic Houston cause of water damage and shutdowns). Catching a weak part in April is a service call; discovering it during a July heat wave is an emergency at a premium. An annual service also keeps many manufacturer warranties valid.
Repair or replace?
A central AC typically lasts about 10–15 years here, a furnace 15–25. Once a system is past roughly 12 years and starting to rack up repairs, do the math rather than keep patching it. A few signals it’s replacement time:
- Repairs are getting frequent or expensive (the “$5,000 rule” — repair cost times age; if it’s high, replace).
- Rooms won’t keep up on the hottest days, or the system runs constantly.
- Energy bills keep climbing with no other explanation.
- It still uses the old R-22 refrigerant, which is phased out and costly.
If you do replace, know the rule: Texas is in the federal “South” efficiency region, which since January 2023 requires a minimum of 14.3 SEER2 on new residential split systems under 45,000 BTU. Higher-SEER2 units cost more up front and use less energy — worth weighing against how long you plan to stay, given how many hours the system runs here.
Humidity is half the battle
Here’s the counterintuitive part newcomers miss: an oversized AC is worse than a right-sized one in Houston. A unit that’s too big cools the air fast and shuts off before it has time to pull humidity out — leaving you with a cold, clammy house and more mold risk. Proper sizing (a real load calculation, not a rule of thumb), good duct sealing, and sometimes a dedicated dehumidifier do more for comfort here than raw tonnage. If a contractor wants to “go bigger to be safe,” ask for the load calc first.
When to call a pro
Filters and keeping the outdoor unit clear of leaves and grass are yours. Refrigerant, electrical, the drain line, and anything under warranty belong to a licensed tech — and a relationship with one you trust is worth its weight come July. Past the AC, the rest of the house runs on the same season-by-season rhythm; that’s the Houston home maintenance checklist.
New to a Houston home?
Just moved in and inherited an AC of unknown age?
Knowing what you’ve got — and what it’ll cost down the road — is part of owning here. If you want a hand thinking it through, or you’re weighing a home with an aging system, I’m glad to help. No pressure:
Frequently asked questions
How often should I change my AC filter in Houston?
About every 1–2 months for a standard 1-inch filter — check it monthly in peak season — and several months for thick media filters. Pets and dust shorten that. A clogged filter strains the system, raises your bill, and shortens its life; it’s the cheapest maintenance there is.
How long does an air conditioner last in Houston?
Roughly 10–15 years for the AC (15–25 for a furnace), with our long run-season pushing the AC toward the shorter end. Past about 12 years and needing repairs, it’s worth pricing a replacement.
What SEER2 rating do I need in Texas?
Texas is in the federal South region, which since January 2023 requires at least 14.3 SEER2 on new split-system ACs under 45,000 BTU (13.8 for larger). That’s the minimum for any replacement; higher SEER2 costs more but uses less energy.
Homeowner · Greater Houston
Buying a home and worried about the AC’s age?
A tired system is one of the bigger costs hiding in a Houston home. I help buyers read what they’re getting into — and sellers decide whether to repair or disclose. Glad to give you a straight read, no pressure.
