I'm going to buy an Enviro Mini tomorrow to lend a hand to the PE in the basement. Think it will work? Upstairs is about 1100 sq ft (2000 sq ft total home) and very well insulated. The PE can hold its own, but on the cold windy Nor'easters that are common here during the dead of winter, it can be a challenge to keep the upstairs far corners of the house warm. Figure might as well do it in the spring before the rush next fall. Hope it all works out. Any pre install Enviro advice out there?