Do natural stone countertops give off dangerous toxins?

— Beth C Marietta, GA

Answered by Molly McCabe, AKBD, CGP, CAPS on December 19, 2012

Is radiant barrier sheathing worth using?

— Betty Wyse Saint Thomas, MO

Answered by Cynthia Phakos on December 19, 2012

What should I do with my A/C unit in the winter?

— Jon Chebeague Island, ME

Answered by Harold Remlinger, AIA, LEED AP, NCARB on December 18, 2012

Please list best green kitchen cabinet makers in the Phila. area.

— julie williams Blue Bell, PA

Answered by Harold Remlinger, AIA, LEED AP, NCARB on December 18, 2012

Do I need special discarding measures with CFLs?

— Cheryl Headlee Xenia, IL

Answered by David Bergman on December 18, 2012

Can I modify my old toilet to be more water efficient?

— Pat Monahan Federal Way, WA

Answered by Scott Grieves, CPM, CEA on December 18, 2012