Doors are a good source of light. All you need to do is know where to install them on your house. Definitely it has to be a place where there is a source of sunlight. Skylight doors are important furniture only if well utilized. Before installing this door on your house you must have a reason as to why you need to install them. Though perceived to be luxurious devices, they can be of great help if well fixed. First determine the energy performance of your preferred door, this will enable you buy one that will help you save on the cost incurred when using lighting devices. Skylight doors should also be able to reduce heating bills. If they are well situated, perfectly and professionally fixed, they will reduce heating costs; this simply means that they should be fixed at a strategic place where you can benefit from the increasing amount of sun light. These doors can also cut down on the costs of air conditioning. This is because when in a place where additional ventilation is required, they are able to do exactly that when it is extremely hot. They are able to allow air permeate into your house for free circulation.