Extend the life of your home air conditioning system by installing and programming a programmable thermostat. Set it so that the temperature is 10 degrees higher when you’re away from home or asleep than it would be when you’re actively using your rooms. It’s called “setup,” and the US Department of Energy says it’s proven to save you significant amounts of money on your energy bills while reducing waste. And demanding less from your home air conditioning system when you’re not really using it is a great way to make it last longer. You should place the programmable thermostat in a spot in your Harrisburg, Hershey, Carlisle, Middletown and Palmyra area home where it won’t get “false readings” from being in direct sunlight or the path of a working air conditioning opening. Don’t forget to buy a programmable thermostat for every cooling zone in your home. You can set the part of the system that serves your bedrooms, for example, to run relatively warm during the day and to start cooling an hour before bedtime. Conversely, set the programmable thermostat that controls your living and dining rooms to run warm while you’re out at work or sleeping, because you won’t be using those rooms during those hours. Set the system to start cooling an hour before you get home.