How to Change (or Clean) Your AC Filter
The single most valuable five minutes of home maintenance there is — especially in dusty West Texas. Here's how to do it right.
DIY & How-To
Changing your air filter is the highest-value five minutes of home maintenance there is — a clean filter protects airflow, lowers your bill, and prevents the most common summer no-cooling call in Odessa and Midland. It takes no tools and no expertise. Here's how to find it, size it, and swap it, plus when a "washable" filter is worth it.
What does the filter actually do?
The filter sits where your system pulls air in (the return) and catches dust before it reaches the blower and coil. In dusty West Texas it does double duty: protecting the equipment and cleaning your indoor air. When it clogs, airflow drops, the system works harder, and the coil can even freeze.
How to change it, step by step
- Turn the system off at the thermostat.
- Find the filter — usually in a return-air grille on a wall or ceiling, or in a slot at the air handler/furnace.
- Slide the old one out and check the size printed on its cardboard edge (e.g., 16x25x1).
- Note the airflow arrow on the new filter and point it toward the unit (the direction air flows).
- Slide the new filter in, close the grille, and turn the system back on.
Keep a couple of spares on hand so you're never tempted to run it dirty.
How often — and which one?
- Check monthly in West Texas; replace a 1-inch filter roughly every 30–90 days, sooner during dust season.
- Match the MERV rating to your system. Higher MERV catches finer dust but can choke airflow if the system isn't built for it — see Daikin Lineup Compared on air turnover.
- Deep media filters (4–5 inch) last months and suit dusty homes — but they live in a special cabinet, not a standard 1-inch slot.
Washable vs. disposable
Some filters are reusable: turn the system off, rinse it, and let it dry completely before reinstalling (a damp filter grows mold). Disposable pleated filters are simpler and often filter finer. Either way, the rule is the same — never run the system without a filter in place.
Where it goes wrong
- Wrong size or backward arrow — leaves gaps that let dust bypass the filter.
- Too-dense a filter for the system — starves airflow and raises the bill.
- Reinstalling a damp washable filter — invites mold into your airstream.
What should I do next?
- Worried about dust and air quality → read Indoor Air Quality in Dusty West Texas.
- Picking a system or filter strategy → see Daikin Lineup Compared.
- Want maintenance handled → join the Mega Care Club, get a free estimate, or call (432) 580-6342.
Frequently asked questions
How often should I change my AC filter in West Texas? +
Check it monthly and replace a standard 1-inch filter every 30–90 days — sooner during the windy, dusty spring and any dust-storm stretch. Caliche and field dust load filters here far faster than in milder climates.
Which way does the air filter arrow point? +
The airflow arrow printed on the filter frame should point toward the unit — the direction air travels from the room into the system. Installing it backward reduces filtration and airflow.
Are washable air filters worth it? +
They can be, if you'll rinse them on schedule and let them dry completely before reinstalling — a damp filter grows mold. Disposable pleated filters are simpler and often capture finer dust. The key rule either way: never run the system without a filter in place.
Written by the Mega Care Solutions team and reviewed by Toby Franco, Owner & President. Last updated July 29, 2026.
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