1.

Attic: If there is no ridge vent, keep gable vents open year-round to ensure proper ventilation.

2.

Gutters: Clean gutters and drain pipes so leaves won't clog them and be sure they drain away     from the house. (Fall: In cold-climate areas) Drain outside faucets.

3.

Fireplace: Clean fireplace of ashes.(Fall) Check chimney for loose or missing mortar. Have chimney professionally cleaned. Make sure damper closes tightly.

4.

Filters: Remember to clean or replace filters once a month, or as needed. Check and clean dryer vent, air conditioner, stove hood and room fans. Keep heating and cooling vents clean and free from furniture and draperies.

5.

Safety Equipment: Ensure that all smoke detectors, carbon monoxide detectors and fire extinguishers are in good working order. Replace batteries in appropriate devices as needed, or at least twice each year.

6.

Air Conditioner: (Fall: In cold-climate areas) Remove window air-conditioners, or put weatherproof covers on them.

7.

Faucets: Check for leaky faucets in kitchen and bathroom(s). Replace washers as necessary.

8.

Windows and Doors: Seal drafty doors and windows. If you added up all of the small cracks where heating and cooling escapes from a home, it would be the same as having a window open. Replace seals as needed.

Information from Bobvilla.com

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