Get in the garden and plant some trees!

“planting trees near the south and southeastern parts of your house can save you a ton of money every year. During the summer, the sun will beat down on your house which heats it up. With the trees in place, the sun’s harsh rays can’t make it to your house and that helps keep things cooler. It’s been estimated that you can save up to 25 percent during the summer months. Plus, trees look nice.”

https://www.lifehack.org/articles/lifestyle/10-easy-hacks-that-could-save-you-energy-and-money-home.html