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Replacement Windows 101

 

Windows come in all styles, types, shapes and sizes, but unless you’re building a new house, the entire above are largely predetermined. There are of course some exceptions. Maybe a earlier houseowner replaced the original windows with units which might be historically inappropriate or inferior. Or maybe you’re adding a household room on the back of the house, the place it would be okay to deviate from the double hung windows within the front; in this situation, you might decide to use casements. Sometimes a houseowner will want to enhance or decrease the scale of the window being changed, however if you’re like most homeowners, the real selections will have more to do with energy-saving features and ease of maintenance.

 

 

Replacement Window Glazing

 

With regard to energy saving, the first thing to deal with is glazing. Efficient home windows typically have two layers of glass and are called dual-pane or double-pane. The small hole between the glass layers creates a barrier to heat flow, which could also be enhanced with an additional layer of glass ( separate insulating chambers), in which case it’s called triple-glazed. The hole or gaps between layers of glazing are often filled with a gas that additional reduces heat flow by conduction. Argon and Krypton, or a mixture thereof, are commonly used gas fills.

 

 

Reflective Films, Tints, and Coatings

 

Reflective films, tints, and low-emittance (low-E) coatings are a number of the other ways window manufacturers are improving window performance.

 

 

REFLECTIVE FILMS

 

Reflective films block much of the radiant energy striking a window—keeping occupants cooler—however they also block many of the visible light. In addition to giving windows a mirror-like look, they typically cause occupants to use more electric lighting to compensate for the loss of daylighting.

 

 

TINTED GLASS

 

Bronze- and gray-tinted glass replicate radiant energy and reduce cooling loads without reducing as a lot the visible light coming into the home. A visual transmittance (VT) of 60% (versus 90% for clear glass) is common.

 

 

LOW-E COATINGS

 

Low-E coatings are more versatile than either reflective films or tints and are virtually invisible. Microscopic metal or metallic oxide particles suppress radiant heat flow out of the window and might be formulated to permit various degrees of solar radiation in. In climates the place heating is the dominant concern, low-E coatings may be used to prevent radiant heat switch out of the house while permitting high solar heat gain. In climates the place each heating and cooling are required, low-E coatings can reduce radiant heat loss while allowing moderate heat gain. In climates where the dominant concern is cooling, low-E coatings are primarily used to reduce solar heat gain. It’s even possible to fine-tune solar heat achieve by selecting a low-E coating with a high solar heat achieve coefficient (SHGC) for south-facing windows and a decrease coefficient for other orientations.

 

 

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