TY - RPRT TI - Investigation of the impact of commercial building envelope airtightness on HVAC energy use AU - Emmerich, Steven J AU - McDowell, Tim AU - Anis, Wagdy PY - 2005 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 7238 DO - 10.6028/NIST.IR.7238 ER -