Energy costs are headed upward and in the not too distant future, paying your heating and cooling bills might seem like carrying an additional mortgage. Installing additional insulation and energy efficient windows may help the problem or you should consider upgrading your HVAC system to help keep your time costs in order, but when you take those drastic measures - are you currently getting the most from your current HVAC system? Tweaking your HVAC System for Better Efficiency Whenever your home was built, an HVAC contractor did load calculations predicated on room dimensions and window locations to determine how big is your HVAC system. The calculations were also used to size the home's supply and return vents and the floor plan determined their utmost locations. Those calculations provided a good starting point for ensuring the house's first owner received an HVAC system that conditioned the inner of your home efficiently, however, everything might have changed the moment a f