Selecting the right window for you greenhouse is very important as they play a huge role in energy management. If the right material is not chosen or if the window is not constructed properly, all your efforts in constructing and maintaining a greenhouse will be a complete waste. Gaps between the frames will not only let the heat out but will also let in cold winter air that will kill your plants. It is therefore imperative that you fit the windows with utmost care to optimize resources and maintain a comfortable environment for your plants.
Greenhouse windows come as part of a kit or piecemeal. The ones the come as a kit might also come with a larger kit including the support structures and other structures necessary for constructing a greehouse. They may even be supplied by a greenhouse construction company, in which case you should consult with the company before choosing a model and locking yourself into a deal in which the windows may or may not be up to your satisfaction.
Greenhouse windows that come piecemeal are for those who wish to customize or build their own greenhouse, or for those who need to replace an individual window that has broken or otherwise ceased to perform. Be sure that the manufacturer specifications match the measurements of the fittings in which you will have the windows installed. A proper fit is key. Price ranges vary according to the model. Rarer designs will of course bring a higher price tag, according to the law of supply and demand.