Home > Products/Tools > Energy Efficiency & HVAC > Interview: Sunspace Business: Changing with the Times Energy Efficiency & HVAC Interview: Sunspace Business: Changing with the Times "The fad years are over, but the market's still strong for spaces that enhance a home's design, are easy to heat and cool, and add usable space." Login or Register to download the PDF version of this article. (212.97 kB)