Skylight Window Buying Guide

There's something about being inside a home but still being able to look up and see clouds. Installing skylights provides a unique view in a living space or bathroom, but skylights are much more than just a window to the sky.

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Many skylights also help to ventilate areas above where they're installed, such as kitchens and bathrooms. This frees spaces from bad odors. It vents smoke in kitchens and allows steam to escape bathrooms, reducing the risk of mold and mildew.

Because skylights bring in so much natural light, the aesthetics are much cleaner than needing to always use artificial light to brighten a room. Skylights make a room feel bigger, which adds to the value of a home.

It's a good idea to understand the energy performance ratings of skylights so you can select your skylight based on the local climate and your home's design. For labeling energy-efficient skylights, ENERGY STAR® has established minimum energy performance rating criteria by climate, based on more detailed ratings from the National Fenestration Rating Council (NFRC). Look for the NFRC and ENERGY STAR labels when buying  skylight.

These criteria don't account for a home's design, however, so if you're building a new home or planning a major remodel, take advantage of the opportunity to incorporate your skylight design and selection as part of your whole-house design.

The physical size of the skylight greatly affects the illumination level and temperature of the space below. As a rule of thumb, the skylight size should never be more than 5% of the floor area in rooms with many windows and no more than 15% of the room's total floor area for spaces with few windows.

If you want to maximize daylighting and/or passive solar heating potential, consider a skylight's position. Skylights on roofs that face north provide fairly constant but cool illumination.

Those on east-facing roofs provide maximum light and solar heat gain in the morning. West-facing skylights provide afternoon sunlight and heat gain. South-facing skylights provide the greatest potential for desirable winter passive solar heat gain than any other location, but often allow unwanted heat gain in the summer.

You can prevent unwanted solar heat gain by installing the skylight in the shade of deciduous (leaf-shedding) trees or adding a movable window covering on the inside or outside of the skylight. Exterior shades will be more effective than interior shades at reducing heat gain in summer. Some units have special glazing that help control solar heat gain.