Sun is a very important source of natural energy. It gives vitamin C, D and many more. But we cannot go every day to beach to take sunbath. It is best to take the advantages of sunlight a little every day in your home. Sun light must enter your house because it is known to kill many such germs and bacteria that are very harmful but cannot be traced or seen with naked eyes. More over sun light in to the room brighten them and brings a kind of positivism to the house.
To make your house properly sun lit use vinyl replacement windows. There are a variety of vinyl windows to choose from. But I would suggest bow and bay vinyl replacement windows that face the garden. Bow and bay vinyl replacement windows, make a cone shape, so they will get more surface area for sunlight. Thus these windows will get maximum sun exposure and one bow and bay vinyl replacement window in living room or as kitchen windows will light up the whole space all together.
You can opt for double hung vinyl replacement windows as ventilator windows. They will allow good amount of sunlight to enter your house. But ensure that these vinyl windows are covered with coating that protects ultraviolet rays to get inside the house.