When a customer complains about high utility bills one of the most common culprits is the HVAC system. It accounts for approximately 50% of the electric bill. With new higher efficiency equipment you could actually save enough to cover the costs of replacing the unit over time. In general a well insulated structure is less costly to heat and cool than a less insulated one. The types of windows used are also a major factor when it comes to loss of conditioned air.
Lowering the costs of your energy bill can save you hundreds of dollars a year. It can also let you know if your home is being more energy efficient. One of the biggest trends of the past few years has been green building and energy conservation.