I’ve owned several homes in Spokane and these are the best things you can do to increase efficiency for cooling & heating. Attic fans won’t help if the attic isn’t sealed! Adding extra insulation without sealing will have disappointing results.
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Tint windows if you can’t upgrade them. Buy the tint from HD or Amazon, make your own spray ( h2o and a few drops of Finish dishwasher liquid). Something like this: https://www.amazon.com/Window-Daytime-Privacy-Mirror-Silver/dp/B00KBAPI7O
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Seal ALL air gaps! https://www.familyhandyman.com/project/how-to-seal-attic-air-leaks/ This is the best thing you can do to keep your house cool. Bathroom fans, light fixtures, etc. Last weekend I rem



