Hi Dunc.
I have approx 500 pots of Disa orchids, cephalotus, and some Dionaea,
I have one greenhouse covered in Triple ply bubble wrap, with a 2kw fan heater thermostatically controlled, the purpose of my post was to see if anyone had used 30gram horticultural fleece to insulate there greenhouse, I had seen adverts suggesting that it was a better insulator than bubble, easier to instal and also you do not get the condensation build up on the fleece, so just testing the water so to speak if someone had tried using it..
Ron