Anyone here ever hear of US Solar Heating or have any of their products ? I live in a modest 1000 sqft home in New England. One side of the house has good exposure to the winter sun. I found a company which makes portable solar hot air heaters - the unit has an optional "stand alone" power unit (PVcell & fan) so there's no additional energy use. This sits inside a window. Not trying to heat the place just take the chill off a room or two. Yeah, yeah I know I could probably build "something" close to what they offer but I really don't have time to re-invent their product.