As more homeowners invest in renewable energy and other high-efficiency appliances, they’re spiffing up the mechanical room and, in some cases, trying to make the air conditioner a showpiece. “The mechanical room is now like the wine room or the library,” says Stephen Bohner, owner of Alchemy Construction Inc. Mr. Bohner says all of his new construction projects include renewable-energy equipment, such as solar. “If you are spending money on that stuff, you want to show it off.” The mechanical makeovers come as the residential heating and cooling industry battles back from lean years. Perhaps inevitably, some designers are trying to tap into the mania for the design flourishes of Apple’s iPhones and iPods.












