Maintenance
How Often Should You Change Your Air Filter? A Complete Guide
Published May 20, 2026 · 3 min read
Changing your HVAC air filter is the simplest, cheapest maintenance task you can do — and skipping it is one of the most expensive mistakes homeowners make. A dirty filter restricts airflow, forces your system to work harder, and can lead to frozen coils, compressor failure, and skyrocketing energy bills.
General Replacement Guidelines
| Filter Type | Replace Every |
|---|---|
| Basic fiberglass (1"–2") | 30 days |
| Pleated (1"–2", MERV 8-11) | 60–90 days |
| High-efficiency pleated (MERV 12-13) | 90 days |
| Media cabinet filter (4"–5") | 6–12 months |
Factors That Shorten Filter Life
- Pets — Pet dander and hair clog filters much faster. Replace monthly if you have dogs or cats.
- Allergies — During high pollen seasons (March–May in Austin), consider replacing monthly.
- Construction or remodeling — Drywall dust and sawdust will rapidly clog any filter.
- Running the system constantly — In peak summer, your AC may run 12+ hours a day.
The Bottom Line
Check your filter every 30 days. If it looks dirty, replace it. A $10 filter is a lot cheaper than a $2,000 compressor replacement. Schedule a maintenance visit or call (512) 555-0142.