Mackers
Wise Old Thumper
You can put all the insulation in the world into your shed but I can guarantee that on the coldest night, your buns will be sat outside!!!! Unless it's tipping down with rain, mine can always be found outside, even if it's -10 degrees. They have the option of going into the warm, dry shed but they choose to be out so I don't worry about them too much. They've all got nice warm, straw-filled carboard boxes and wooden boxes in the shed, as well as a carpeted floor. If we had prolonged freezing weather, I'd give them their snugglesafe's just before bedtime.