Ok heres some ideas to keep your home cooler in the summer/for free
Step 1: Turning Off the Lights.
every time you leave your house make sure to turn off the lights tv basically any thing that generates heat
Step 2: Closing Doors & Windows.
You don't have to go this extra mile but I did and it helps a lot. Again when you leave your house close the doors close the curtains etc.
Step 3: The End
after you have done all this you will notice your house up to ten degrees cooler
I hope this Instructable help