Enthalpy wheel in a heat recovery unit
As the cost of energy rises engineers are looking for ways to improve and increase energy efficiency. Aside from HVAC equipment with higher energy efficiency rates, improving structures for less heat loss and heat gain, and building automation systems giving the equipment precision control for better efficiency of the equipment, there are other ways to increase energy efficiency inside buildings. One of the ways to increase energy efficiency inside buildings is to add energy recovery wheels to the economizer systems. A US Department of Energy study concluded energy recovery wheels can save over 15% of the energy used in commercial HVAC applications.
It is becoming increasingly necessary to have your home checked for home pressurization. Does your home have a negative pressure inside of it? Do you have a gas or oil furnace which is inside the home and uses the air in the home for combustion air to fire the furnace or 
