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My AC service contractor wants to sell me a new unit with environmentally friendly Freon. What does that mean? Should I buy it?

— Ellen Stover Tampa, FL

Answered by Steve Saunders on July 29, 2010

My daughter has gone to college, so her room sits unused. Should we close it off and close the AC vents?

— Earl Bollinger Covington, LA

Answered by Tammy Schwolsky, LEED AP, GPR, HPwES on July 26, 2010

We would like to design a flat-roof home that is green. What do we do with the ductwork?

— Elizabeth Houston, TX

Answered by Rich Franz-Ünder on July 20, 2010

What size AC unit should I use for a 1,986 sq. ft. home in Kingwood, Texas?

— Jason Kingwood, TX

Answered by Danny Kelly on June 24, 2010

Why does our AC kick on almost constantly at night, running a minute or so and then turning off?

— Liz San Antonio, TX

Answered by Rich Franz-Ünder on June 17, 2010

I am converting my oil burner to a high-efficiency gas heating system. What do I do with the oil tank and oil?

— Peter East Norwich, NY

Answered by Rick Goyette on June 9, 2010

Please recommend an energy efficient furnace for a 3,000 sq. ft. two-story with finished basement. Are there any potential rebates?

— Van Nguyen Lorton, VA

Answered by Karen Smuland on June 6, 2010

Should I follow my service company's advice and replace my current AC unit with a new "environmentally friendly" Freon unit?

— Gaby Mendelsohn Charleston, SC

Answered by Steve Saunders on June 2, 2010

My new apt. has inefficient electric heaters plugged directly into outlets. What can I replace these with without redoing the whole system?

— Andrea New York, NY

Answered by Bill Bradbury on June 1, 2010

We use baseboard heat and hot water that comes off an oil furnace: can we supplement with solar water heating?

— Jen H Castine, ME

Answered by David Edwards PhD on June 1, 2010

 
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