HVACs for new and retrofitted buildings are an expensive pain in the neck.  But they can be cheaper, easier, and better through new technology. 

• Most energy efficient buildings are under-ventilated because ventilation wastes energy for heating and cooling. The result is ventilation which is inadequate for resident health. But demand controlled ventilation (DMC) can achieve healthful buildings by increasing ventilation rates when needed, but without losing energy efficiency. It can meet Passive House standards. 

• The separation of the heat pump from the ventilation system, and putting the pumps on the roof, causes high installation and maintenance costs. By putting both in the same machine, these costs can be significantly reduced.  

• We are installing and testing new equipment which seem to achieve all these goals. The future, which includes energy efficiency, building health, and lowered cost, may have arrived.