PREFACE The inspiration from this guide was the result of a working session held at the end of the 7th International Cold-Climate Design Conference held in Calgary in 2012@ cosponsored by ASHRAE@ SCANVAC@ and REHVA. Tom Watson and Bjarne Olesen were instrumental in the encouragement of ASHRAE hosting the Cold-Climate Design conference and conference and in ASHRAE developing this Guide. A special thanks to the City of Calgary@ Aqua Air@ Convergint@ Uponor@ Scott Springfield Manufacturing@ Erich Binder Consulting Limited@ Government of the Northwest Territories@ Low Carbon Design@ and DLB Associates for their support and effort in making this design guide a reality.