Solar heating window unit

I finally got the bulk of the materials needed to build the heat grabber. The large 4ft x 8ft sheets of rigid insulation were the most challenging, but they did successfully fit in our minivan, with no kids. The one thing I am missing yet is the glazing, or the glass to cover the front. I haven’t found a good source for the reinforced fiberglass, and some of the stuff that the local box stores carry would double the price of the entire project. I’m thinking of just trying some of the plastic that is used for weatherizing windows from the outside, I’m just not sure how translucent it will be.

I’m not sure when I’ll have the opportunity to work on it though, hopefully later this week. We are supposed to be having near record warm this week which would be good for painting the box black, but I don’t think I’ll have it done before then.