You may be surprised at the number of times your heating and air conditioning units turns on and off in a day. This may be happening with the help of children who find it necessary to play with the buttons on the thermostat. Too much turning on and off of your heating and air conditioning equipment is bad for it.

A time delay relay gives a 3-5 minute time delay from the time the thermostat has been adjusted to the time the air conditioner or furnace turns on. This time delay keeps your unit from wearing out before its time.