How can I tell if my air conditioner guy is sizing the correct unit for my house?

— David L. Roth Fort Myers Beach, FL

Answered by Rob Smith, LEED AP H on January 28, 2011

How do you seal leaky ductwork?

— denise mack Utica, MI

Answered by David Edwards PhD on January 15, 2011

How should we heat and cool our new garage addition?

— linda Salt Lake City, UT

Answered by Harold Remlinger, AIA, LEED AP, NCARB on January 5, 2011

We need to replace our boiler. Should we go to gas or stick with oil?

— Helen Torris Montclair, NJ

Answered by Raymond Pruban on December 29, 2010