Jambs are frames used to support the window in the wall. Those frames on the side are, logically enough, called side jambs. The frames at the top is a head jamb. There are no jambs at the bottom. This frame is referred to as a sill.

Windows do not cause condensation - excessive humidity causes condensation on the interior of windows. People notice moisture on windows before other surfaces because the temperature is lower.

The multiple hollow chambers provide a thermal break, rigidity, and strength without excessive weight. A solid frame would be heavy, difficult to work with, expensive, and would not perform as well.

Vinyl windows and doors are durable, weather-resistant and low maintenance. They do not need to be finished after installation and never need painting or sealing. The vinyl cannot rot, rust, pit or corrode and is unaffected by moisture, salt air, pollution and airborne chemicals.

Wood is beautiful and a great insulator. With proper preservatives, wood is durable and corrosion resistant. It also allows many finish options. It can be clear-coated, painted or stained to complement any interior decor. Many exterior finish types and colors are possible as well. Plus, wood is a naturally renewable resource.

Replacing old, worn windows can give your home a beautiful new look while improving its energy efficiency. Improved energy efficiency will lower heating and cooling bills, add value to your home, and make it more comfortable.

Two types of gas are used to fill the space between panes of glass: argon and krypton. These gasses are denser than air, which contributes better insulation.

Low-E, or low-emissivity, refers to how a window reflects certain wavelengths. A window with a good low-E lowers your energy bill because in the summer it reflects sunlight and in the winter it absorbs it to help in heating your home.

One way that insulation is created is with dead-air space between panes of glass. Therefore a double-paned window gives more insulation than a single-paned one. Other factors contribute to the insulation qualities of a window, such as a gasket, the material type, and the gas used in a gas-filled window.

Window material choices vary by region. In the Northeast, houses use mostly vinyl and wood windows, whereas, in the Southwest, more aluminum windows are used. This has a lot to do with the building codes and the fact that aluminum conducts heat and cold.