Doors are much easier to seal than windows as they have fewer moving parts. To add weather stripping so it doesn't cause binding, it is best to even out the gaps around your door before starting. If possible, shim the door hinges to create a uniform gap all the way around your door. The weatherstripping you should use is the same used for windows. Plastic V-strips and spring bronze are great for the top and sides of the door. You must use a different material for the bottom as you deal with heavy foot traffic. There are special seals designed for door bottoms including door sweeps, door shoes and thresholds. A door sweep attaches to the bottom face of the door; its usually rubber gasket that drags along the floor or threshold to create a seal. A door shoe fits on the bottom edge of the door with a flexible gasket pressing tightly against the floor or threshold. A metal threshold with a rubber gasket does the opposite; it presses Agustin the bottom of the door to stop drafts. These tools can be used independently or in combination when necessary. If you have a gap below your door that is too large for a gasket to work properly, a door shoe and a threshold can be combined to create a seal. Garage doors have their own special seals (usually made of rubber) that attach to the bottom of the door and between the jams. A gap as small as 1/4 inch along the bottom of a 36 inch door is the equivalent of having a 3 inch square hold in your door. By using one of the affordable solutions above, you can save a noticeable amount on your utility bills. If you are concerned about your homes efficiency, contact a Denver energy audit company to analyze you homes efficiency. They will be able to tell you what doors and windows need to be sealed and other areas of your home that need to be focused on as well.