I’ve been walking around my house feeling for cold drafts from windows and doors. I actually found one window that was slightly open (oops!). If you can feel cold air or see daylight when your exterior doors and windows are closed, it might mean the seal around them (called weatherstripping) is cracked or just plain gone. Weatherstripping comes in all sizes and price ranges at the hardware store, and usually just stick right on. Not only will your house feel more comfortable and your heating bills will benefit, but fewer insects can get in. That seals the deal for me!