By blocking solar heating, you can reduce your air conditioning bill.
In hot weather, close your storm windows. Each layer of glazing reduces the solar radiation that penetrates into your home.
Close the window blinds or curtains on the sunny side of the house. A white color window blind or white fabric curtain liner will reflect some of the solar radiation back out of your house. A reflective film liner on window blinds and curtains would be even better. I have not seen that done yet. Maybe we can start a new fashion trend.
If you have a very old house that has functional shutters, you can close them to act as an outdoor sun block. Must folks have never seen shutters that can be closed. Real wood shutters are hung on hinges on the outside of the house. They work like barn doors that close off the window opening. Shutters were made for security, protection of window glass from storm damage and to seal out the cold in the winter. Most modern houses have decorative shutters that do nothing useful other than make a nesting place for insects.
Awnings can help by shading your windows. If you have them roll them out on hot days. If you live in an area that has many days above 80 degrees, consider adding awnings to your south and west windows.
Planting shade trees on the south and west sides of your house will help block the summer sun. They drop their leaves to let solar heating warm your house in the winter. If you live down under, that would be the North and West sides of your house.
These methods for fighting solar heating cost you nothing on your energy bills. They will cut your electric bill by reducing the power used by your air conditioner.
Some day we will have windows that darken like sunglasses in the summer and stay clear in the winter.
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