Roof windows and skylights don’t just maintain good ventilation to improve your house’s appeal, but also reduce your energy bills as you’d use less electricity in lightning and air conditioning. Read on to reap the most out of roof skylights through proper selection and installation. As there are different types of windows, you need to consider the design, thermal efficiency, frame, insulating capacity, and glass quality while you buy the skylight windows. The glass and frame have an insulating capacity that determines the comfort in extreme seasons. Check the visible transmittance coefficient, or the amount of light entering into your house. Higher coefficient is good, but too much light from the wrong direction causes a lot of glare. The two main types of skylights are curb-mounted and frame-in-place. The curb-mounted skylights are a level higher than the roof surface. The frame-in-place skylight is almost flushed in the roof surface. The first aspect, when considering for skylight installation, is the direction of light, keeping in mind the changing needs with different seasons. You’d not want the window to face the sun directly as it’d get very hot in summer. If you’re in the southern hemisphere, your window catches most natural light when facing the north and vice versa. This is how you avoid heavy glares. Skylights need to be sealed well during installation to avoid leakages.