Even more important than single pane or double pane is to make certain your windows are LOW -E especially if the windows are in the path of receiving direct sunlight. Low E windows will be double pane and they block out alot of the radiant heat thus reducing the heat that would come into the hosue and also protect your furniture, rugs etc from bleaching out due to over sun exposure. There are different grades of LOW E and they are priced accordingly.
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