If you have older double hung windows in your house like millions of people do, these are a perfect place to install weather-stripping to seal drafts and save energy.  If the windows are still in good shape and serviceable, weather-stripping can save thousands of dollars compared to replacement.  New windows are definitely more energy efficient than those installed just a few years ago, however replacement windows can take many years to save enough energy to pay for themselves. For just a few dollars per window, you can install weather-stripping and keep the cold air, dust and even noise out of your house while saving money on utility bills.

The most common areas for air leakage around double hung windows are:  between the sash and the jamb, between the bottom of the sash and the sill, between the top of the sash and the window head, and where the two sashes meet.

One of the most common types of weather-stripping to seal the space between the sash and the jamb is a V-Shaped Polypropylene weather-stripping. This type of weather-stripping is secured to the jamb with a self-adhesive strip and then the other half of the V presses against sash. The polypropylene is smooth, thin and durable enough for the sash to slide easily open and closed.  In just a couple of hours of time and a small dollar investment, weatherizing and sealing  your old windows will pay off in lower energy bills and increasing the comfort of your home.

There are quite a few types of weatherstripping because different situations require different kinds of material to be effective. The following types listed are all available to homeowners, and most listed can be used for either doors or windows.

Pressure-sensitive adhesive-backed foam – the easiest weatherstripping to apply, and it is quite inexpensive. Available in both rubber and plastic, adhesive-backed foam comes in rolls of varying lengths and thicknesses. When compressed by a door or window, the foam seals out the air. As an added advantage, these strips also provide a cushioning effect that silences slamming. This type of weatherstripping generally lasts from one to three years.

Spring-metal strips (V-shape or single) – available in bronze, copper, stainless-steel, and aluminum finishes. Most manufacturers package spring-metal weatherstripping in rolls, and they include the brads necessary for installation. This kind of weatherstripping requires patience and skill regarding the installation process.

Felt – one of the old standbys and is very economical. It comes in a variety of widths, thicknesses, qualities, and colors (brown, gray, and black). Felt strips are usually nailed in place, but they are also available with a pressure-sensitive adhesive backing.

Serrated metal – felt-or vinyl-backed weatherstripping that combines the sturdiness of metal with the application ease of felt. Most manufacturers package serrated-metal weatherstripping in rolls that include brads for installation.

Tubular gasket weatherstripping – It’s made of extremely flexible vinyl, silicone or other plastic compound. It is usually applied outside where it easily conforms to uneven places. Typical colors are white and gray. This weatherstripping should not be painted because paint causes the tube to stiffen and lose its flexibility.

Foam-filled tubular gasket weatherstripping – includes a foam core in the tubular part of the gasket. The foam provides extra insulating qualities and extra strength. Moreover, the foam-filled tubular gasket will hold its shape better than the hollow-tube type, and will remain flexible in colder climates. It should not be painted.

Interlocking metal weatherstripping – requires two separate pieces along each edge of a door. One part fits inside the other to form the seal. One piece goes on the door, while the other is attached to the jamb. Because installation generally requires professional-level cutting, no step-by-step installation instructions are provided for this type of weatherstripping. If you already have interlocking metal weatherstripping, to keep it working properly, straightening any bent pieces with a screwdriver, pliers, or a putty knife.

Jalousie gaskets – clear vinyl tracks that can be cut to fit over the edges of jalousie louvers. They snap in place for a friction fit.