It makes good sense to turn lights and appliances off when they are not needed, but you’ll save even more on you energy costs if you reduce the amount of energy needed for heating and cooling.Heating and cooling (“space conditioning”) accounting for 50 to 70% of the energy used in the average American home. About 20% goes for heating water. On the other hand, lighting and appliances and everything else account for only 10 to 30% of the energy used in most residences.While, unless your home was constructed with special attention to energy efficiency, adding insulation will probably reduce your utility bills. Much of the existing housing stock in the united states is not insulated to the best level. Older homes are likely to use more energy than newer homes, leading to very high heating and air conditioning bills. Even if you own a new home, adding insulation may save enough money in reduced utility bills to pay for itself in a few years, continue to save you money for as long as you own the home and increase the resale value of your house. Owens CorningCertain TeedKnauf Insulation