A casement is a window that is attached to its frame by one or more hinges at the side. They are used singly or in pairs within a common frame, in which case they are hinged on the outside. Casement windows are often held open using a casement stay.
While casement windows are already highly efficient due to their design, you can make them even more energy efficient by selecting windows that offer certain traits:
- Low-e glass: Low-e or low emissivity glass coating is designed to bounce the sun’s rays away from the home in summer, to reduce solar heat gain. The same coating reflects the heat inside your home so that it doesn’t leak through the window.
- Argon gas infill: Argon gas infills insert argon gas between panes of the window. Argon is less conductive than normal air, so it actually reduces the amount of heat or cold that passes through the window.
- Double/triple pane casement windows: Adding additional panes of glass to a casement window increases its energy efficiency by sandwiching more layers of insulating air or gas between the inside and outside of your home.
- Energy Star label: Look for the Energy Star label to indicate casement windows that are constructed using best design practices and energy efficient materials.