Karen has worked for more than 20 years in the energy efficiency and sustainability sector. At Which?, Karen cuts through the jargon to uncover the environmental issues that matter most to consumers ...

. Q. I hate to still keep you on the "cold roof" subject, but I want to make a cold roof on my 6,000 square foot Victorian 4-unit with 2 furnaces that are located in the attic. What can I do? K.C.

Winter comfort problems aren't always caused by insulation or furnaces. A lesser-known attic upgrade plays an important role ...