Built into the roof of a window in such a way that light comes in, a skylight is also at other times installed to add aesthetic appeal to the house. At other times, installing of this type of window is for the sole purpose of a passive heating strategy. They come in different styles, designs and differing added components. In essence, choosing a skylight that is too large means you are allowing huge amounts of sunlight into your house. The only problem with these types of windows is that they have poor insulation and as such allow huge amounts of heat to escape during cold weather. During warm weather, the skylight allows huge amounts of warmth hot enter the house as well. When installing skylights, experts propose that consideration of the amount of sunlight hitting the roof directly. When compared to a window, a skylight allows as much as eight times the amount of light into a room. There are ventilating skylights opened to allow passage of air freely through. This type is best for kitchens and bathrooms since they are prone to lots of moisture and as such, a steady flow of air is important to keep them dry.