How to Maintain an Air Conditioner | Ask This Old House

Ask This Old House plumbing and heating expert Richard Trethewey shares tips for keeping an air conditioner running efficiently
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Time: 30 minutes

Cost: $20

Skill Level: Beginner

Tools:
Vacuum with brush attachment

Shopping List:
Correctly sized filter

Steps:
1. If your air conditioner never shuts off, it may not be running as efficiently as it can be.
2. Ensure the outside condenser is debris free. Use a vacuum cleaner with a brush attachment to keep the fins clear of dust, pollen, pet hair, or other contaminants.
3. Periodically change the filter on the indoor air conditioning system. Use the existing one as a guide to purchase the correct size and follow the “flow” arrow when reinstalling.

Resources:
The shop vacuum, brush accessory and HVAC air filter shown can be found at the local home center.

About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we're ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O'Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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How to Maintain an Air Conditioner | Ask This Old House
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