Check for air leaks around windows

Take a look at all places in your home where two different materials meet as well as external facing doors and windows. Run your finger across the seals and make sure there are no leaks. A simple helping of caulk around these leaks could save you 5-15% on your heating and cooling costs.

You can even use weather sealing tape around windows instead of caulk, but the finished product will rely heavily on your ability to tape cleanly.

Weather Stripping

Doors and windows typically come with what’s known as weather stripping. These are lengths of rubber or metal that seal gaps, while still allowing the window or door to open and shut properly.

Weather stripping isn’t just for doors and windows. You can also use it in other drafty areas, too, such as around air conditioners and inside-to-outside gaps.