It will just make your beer warmer. Can't fight thermodynamics. Room at 78 means beer at 78. Exothermic beeraction of beermentation means beer gets warmer. The shield holds that heat IN, meaning your beer stays hot even longer.
Tub of water, T-shirt, and a fan. Cheaper, and it'll actually work.
Edit: Sweet! Charlotte! I visit a company there on business trips plenty, love that place.