Use exhaust fans

Use exhaust fans to pull heat out of the attic in the summer.

Plant shade trees

If you plant some shade trees around your home, it will be less hot inside in the summer months.

Buy out of season clothing

You may get clothes cheaper if you buy them out of season. If you buy some winter clothes and other items in the summer, they may be reduced since less people are buying them.

Fly during off season

If you fly during the summer when everyone else usually travels, you will probably pay more money for the tickets. Flying during the off season is usually cheaper.

Park car in shade

Parking your car in the shade in the summer will keep the inside of the car cooler. You won't have to blast the a/c when you first start the car up because it is 120 degrees inside. This will save money on gas.

Use fans instead

Some rooms really don't need a window A/C if nobody is really ever in the room. For those rooms at least you can try using just a fan. It can save you a lot in electricity cost each summer. If you have summer all year round, the savings can be big.