To save money and energy you may need a new AC system and it might be time to switch to a programmable or smart thermostat that can be set to adjust the temperature in your home at certain hours of the day. Smart thermostats enable you to maintain a comfortable temperature in your home and many of them can be operated remotely.
Keep your programmable thermostat set as high as is comfortable (The DOE recommends 78 degrees Fahrenheit), and when you’re away from home, set the temperature even higher. you can trim 10 percent off your energy bill by setting your thermostat by 7 to 10 degrees higher for eight hours a day, the DOE estimates.
And don’t drop it down to a super-low temperature after being gone all day. Doing so doesn’t cool your home any faster and can result in excessive cooling and a bigger power bill at the end of the month.
The location of the thermostat is also important. To work efficiently, it should be on an interior wall away from direct sunlight, drafts, doorways, skylights and windows, according to the DOE. And don’t place furniture or curtains where they would block AC vents.
Another trick: Set the AC fan speed on high, except on very humid days, the DOE recommends. On humid days, set the fan speed on low. Why? The slower speed will remove more moisture from the air and improve the comfort of your home.