Air-tightness research, the focus of Chapter 2, included a substantial effort to create an air leakage database. Data were used to determine the stock characteristics of home air‐tightness and associated impacts. The researchers also analyzed potential air‐tightness measurement techniques for use in multizone (e.g., multifamily) buildings.
Figure 2.3.1: Impact of Envelope Tightening on the California Housing Stock. The graph shows the distribution of home energy savings from retrofitting the entire housing stock to comply with ASHRAE 62.2 and tightening the housing stock by various levels. Scenarios are described in the text. Change in household kilowatt-hours is for site energy.