Posted: 18/05/2012 at 14:54
My GH is my sanctuary - I could (do, actually) spend hours there, especially in the spring when I'm sowing seed, pricking out plants and potting them on etc. I take my radio and it is a little bit of heaven, snug inside no matter what the weather is like.
My suggestions would be, like others, get one as big as you can afford and locate. Then have an electric fan, that can be set for "frost" setting. It keeps the temperature just above freezing, but only switches on when the thermostat registers the temp. I have it a little bit warmer when I have seeds in there, but also use electric propogators, which have helped enormously.
I also insulate in the winter - bubble wrap does keep it extra cosy, so the running costs are kept as low as possible.
Hope that helps.