A "Deep Energy Retrofit" may involve the following improvements and changes:
Significantlyimproved energy efficiency, once a current or baseline energy use is defined for the building;
A whole building approach that involves building envelope, energy consumption, heating and cooling, ventilation and occupant comfort. This will require something called an 'energy model', a virtual goal for energy performance that acts as a starting point for assembly design;
Increased air tightness to below 1 ACH (air change per hour) with the addition of mechanical ventilation (HRV or ERV);
Increased and continuous insulation around the entire building;
Replacement high efficiency windows and doors;
Performance check or 'commissioning' of the building and its systems at close of construction or after the retrofit.
A deep energy retrofit is a major building intervention, requiring many phases of construction.
