Conservatory Roof Conversions in Wales from Pemier pro experts local recommended MPN. IS YOUR CONSERVATORY TOO HOT OR TOO COLD? Polycarbonate roofs often offer poor insulation with your heating literally going through the roof making the room hard to heat in the wintertime. Summertime brings a different challenge with polycarbonate creating far too much heat inside the room resulting in the conservatory being virtually unusable in the warm weather. AT WALES MPN WINDOWS WE HAVE THE SOLUTION!