It really is a great question for those living in the hot, humid climate we have here in Florida. If you perform an internet search for “ENERGY STAR climate zones,” you will see a color coded map of the climate zones used for energy work. For our purposes, I will explain. The tip of Miami is Climate Zone 1. All of Florida and the Gulf Cost into Southern Texas is Climate Zone 2. Climate Zone 3 goes horizontally across the country splitting North Carolina about in half and goes across the country to southern Nevada. Climate Zone 4 is fairly small taking in the remainder of North Carolina and most of Virginia. Climate Zone 5 is north of that. The extreme northern US is Climate Zone 6. Most of what you read about energy online is discussing issues in heating climates which would be Climate Zones 4 and above.

Northern climates are heating climates which attempt to keep heat and moisture in the home because their outside air is cold and dry. Florida is a hot humid climate where we want to keep cool, dry air inside and hot humid air outside. Building Science says, hot always moves to cold, wet always moves to dry and high pressure always moves to low pressure. Those forces are always moving until balanced.

So back to your original question. In the north the windows are designed to keep the heat in the home. In the south, just the opposite. Windows are designed here to keep the sun’s radiant heat reflected back outside.

Posted in: Conservation Questions