one of the guys from www.brmlab.cz hacker space, (Timothy) recommended that i look into these options above for top insulation at affordable prices. Here are the links of materials for sale online.
also mentioned that solar insulation on the black curtains on the front. This will keep heat in the building in the winter and cool in the summer. Looks like an interesting way to improve the energy efficiency of the building, with minimum fuss and cost.
also. asked about options with underfloor heating. Sent this youtube link. does not look so hard to do the installation floor heating link.