US DEPT OF ENERGY SAYS:
You can lose up to 60% of your heated air before it reaches the register if your ducts aren’t insulated and travel through unheated spaces such as the attic or crawlspace. Get a qualified professional to help you insulate and repair ducts.

With a ceiling fan, you will probably be comfortable with the thermostat set at about 78°F. Each degree you are able to raise the thermostat, you will save 3–5% on air conditioning costs.

EPA SAYS THAT A PROGRAMMABLE THERMOSTAT CAN SAVE YOU UP TO 180$ A YEAR ON YOUR HEATING AND COOLING COSTS

Many homes cost too much to maintain at a comfortable temperature. The U.S. Department of Energy estimates that 46% of your utility bill is allocated to Heating and Cooling. The EPA estimates savings up to 10% of a homeowner’s utility bill by properly air sealing and insulating the home’s envelope.
Everyone knows that when summer hits in Arizona, it gets hot, meaning the cost of energy rises, especially if you are on a time of use plan.