Air filter, vent and thermostat fixes
Replacing air filters, fixing return grilles and registers, and securing thermostats.
The air filter is the simplest part of the system to look after, and a dirty filter is one of the most common HVAC findings in recent HomeCloud evaluations. A clogged filter makes the system work harder and can leave rooms less comfortable.
This page also covers loose or broken vent grilles, blocked return vents and loose thermostats.
What our reports priced this at
| Work | Most homes | Middle price | Based on |
|---|---|---|---|
| Replace air filters | About $150 | The 35% of homes where it was priced |
What HomeCloud reports priced this fix at in homes we evaluated Sep 2025 to Oct 2026. The range is the middle half of homes; the middle price is the median. Your price comes from a written estimate for your home. Grille, register and thermostat fixes were too rare in the sample to show a range.
What affects the price
- Filter size and type
- Thicker, higher-grade filters cost more than thin basic ones.
- How many returns
- Homes with several return vents or two systems have more filters to change.
- Where the filter sits
- A filter in a ceiling return or in the attic unit takes more time than one in a wall grille.
Common questions
How often should I change the air filter?
Check it every month and change it when it looks gray or dusty. The packaging says how often that type of filter should be changed. Pets and renovation dust mean changing it more often.
Where is my air filter?
Usually behind a return vent grille on a wall or ceiling, or in a slot at the indoor unit.
More HVAC resources
Other HVAC repairs
Get your HVAC work priced
Tell us what's going on with your heating or cooling and we'll send you a priced estimate.
Get an Estimate