Q: I want to replace my original windows. How can I compare the various window design and material characteristics?
A: Selecting the best replacement window is not only dependent on the design characteristics, but also your specific house and family’s lifestyle.
The three main criteria to consider when selecting replacement windows are the frame material, style of window, and glass type. For energy efficiency, the glass type and style of window are more important than the frame material. Various frame materials have a greater impact on functionality, durability, maintenance, and appearance.
The typical frame materials for residential windows are vinyl, fiberglass, wood, and clad wood; there are advantages to each. Vinyl window frames are energy efficient and virtually maintenance-free. They also are made to the precise dimensions of the window opening instead of having to shim out standard sizes.
To attain adequate rigidity, the vinyl frame extrusions have many internal chambers inside. These chambers create natural insulation, improving energy efficiency. For even greater efficiency, choose ones with foam insulation injected inside the chambers.
Vinyl frames for large windows, especially dark colors in hot climates, should have internal steel reinforcement. When vinyl gets hot in the sun, it loses strength.
Fiberglass window frames are very strong and can be painted any color to match the interior or exterior. Since the primary component of fiberglass is glass, these frames expand and contract at about the same rate as the glass panes. This minimizes stresses between the glass and frame as the temperature changes.
This characteristic is an advantage for dark frame colors exposed to the sun, which can create a substantial temperature range throughout the day and night. The strength of fiberglass frames is also an advantage for smaller windows because narrower frame cross sections are acceptable. With other frame materials, a thicker frame reduces the glass area too much.
The best window style depends on the appearance and features you desire more than its efficiency. People often select double-hung windows because they can be tilted in for easy cleaning. Windows that close on a compression seal — such as casement and awning windows — tend to provide the best long-term airtight seal. Casement windows also can catch cross breezes for better natural ventilation.
The glass type is the key to the efficiency of a window. Double-pane glass with low-emissivity coatings and inert gas (krypton or argon) in the gap between the panes is adequate for most climates. Triple-pane glass makes sense for very cold climates but is more expensive and heavier.
If you decide to replace your home’s windows, there are many options that fulfill different preferences. Get quotes from several companies on the varying styles so you can make the best choice for your home.
