Thanks for your replies. I suppose I should have been a little bit more specific. It was mainly with regards to the mesh windows. I have had some clear plastic fitted onto wooden frames that will slot over the mesh but I was wondering if anyone has any kind of tarp fitted onto their sheds etc.
I have had bunnies for many years so know the implications of a good sound weatherproof home, when it comes to insulation, I have put some on the inside of the roof, pirely for hot days and have not insulated in between the walls, neither would I use a heater. They are rabbits after all and I believe that a rabbit will cope with heat and cold naturally - with a little human help if it becomes very cold but normally my rabbits are fine without the pampering.