windows for new homes

Replacing energy-inefficient windows in existing buildings is often an expensive project, with a long pay-pack period. But when building a new home, the price differential qualified vs. unqualified windows will be paid quickly.

Windows should be 1) properly sized, 2) well located, and with a 3) proper design and glass, and the 4) right type of sashes and frames. And they should respond to your climate needs.

The type of windows

Between the several window designs, the casement one is the most energy-efficient. But there are other features that you may want to consider when choosing the windows for your new home.

See: Types and designs of windows

The type of glass

Pay attention to the type of glass... The right type depends on climates zones, but the criteria for choice is easy to understand:

1) Choose a two or three-pane glass; single glass windows are inefficient;

2) A low U-factor glass (heat-loss factor) will reduce your heating costs in winter (windows with a U-factor of 0,32 or less will provide comfort and lower heating bills in winter);

3) A low SHGC (Solar Heat Gains Coefficient) will keep your home cooler in the summer, if the windows are exposed to the sun; a SHGC of 0,4 or less is a good option to get lower air conditioning needs.

4) A low VT (Visible Transmission) glass will cut glare for the windows facing low-angle sun in east and west windows, in sunny climates.

See, for details: Windows Basics

Windows opening area

There are now energy rating software for assessing the optimal window area. Too large windows will make the house too hot in summer and hard to keep warm on cold weather conditions and cold nights.

The best total window area is usually between 10 and 25% of the total floor area of the house.

Windows location

South-facing windows are excellent for winter heating in northern hemisphere (the same for north-facing windows in southern hemisphere countries).

The area of north-facing windows should be reduced in the northern hemisphere (the same for south-facing windows in the southern hemisphere), while west and east facing windows should also involve a small or relatively small area.

For more details on this issue, see: Windows and daylighting.

The type of frames and sashes

Good performing windows demand high-quality frames and sashes. Details like thermal breaks or argon filled panes and corners are very important elements for the energy-efficiency of a window.

See:
New homes and Windows
Qualified Windows Basics
Qualified Doors Basics
Skylight basics
Overhangs
Glazed Doors