How to Add Weather Stripping to Windows
Install weather-stripping to windows reduce heating and cooling costs by 10% to 15%. Weather-stripping for windows comes in many styles: felt, vinyl, or foam rubber on a wood or plastic strip. The easiest type of weather-stripping to install is the adhesive-backed type. Here's how you can add adhesive-backed V-seal weather-stripping to a double-hung window.
More detailed information on weather-stripping and caulking