How Often Should You Change Your AC Filter?
The 90 days printed on the packet assumes mild weather and no pets. In North Texas, check monthly and expect to change a 1-inch…
The 90 days printed on the packet assumes mild weather and no pets. In North Texas, check monthly and expect to change a 1-inch filter every 30 to 60 days through summer — your system runs far more hours here than the packet assumes.
A realistic schedule
| Situation | Change roughly every |
|---|---|
| 1-inch filter, summer, no pets | 60 days |
| 1-inch filter, summer, pets or allergies | 30 days |
| 1-inch filter, winter | 90 days |
| 4–5 inch media filter | 6–12 months |
| Recent renovation or nearby construction | 30 days, regardless |
The honest test beats any schedule: pull it out and hold it up to a light. If light doesn't come through, it's done.
What a clogged filter actually breaks
This isn't just about dust. A blocked filter starves the system of airflow, and that causes real failures:
- Frozen evaporator coil — not enough warm air over the coil, so it ices up
- Water damage — that ice melts and overflows the drain pan
- Blower motor strain — it works harder against the restriction, and they're not cheap to replace
- Higher bills — the system runs longer to reach the same temperature
A large share of the emergency calls we take in July trace back to a filter nobody changed in spring.
Don't over-filter
A very high MERV rating restricts airflow on a system that wasn't designed for it. Higher isn't automatically better — MERV 8 to 11 suits most residential systems. If you need better filtration than that for allergies, the right answer is usually a thicker media filter, not a denser 1-inch one.
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