Buy a snugglesafe heat pad. I was sceptical at first and wasn't convinced out two little guinea pigs would use them. But they love it!!! They are currently housed in our porch and although it's dry and draught free, I felt they were lacking some heat so I bought one of these pads. I checked on them this evening, warmed up the pad and when I went back to give them their food, they were both sitting on it! They looked really, snug and cosy!
They do seem lovely but we are a microwave free house (I had one in my last house which I only ever used to melt chocolate - about 4 times in 6 years), so my boys have to manage without. They have lots of blankets and carpet under, over and around the cage for insulation at night and are always warm when I pick them up.
That's good to hear Nancy! Our piggies and bunny are in the utility room but I've been worrying that it's still a bit chilly at night. I have just ordered 2 snugglepads online much cheaper than the pet shop (thanks for the tip 70!) Toasty piggies here we come hopefully!
snugglepads arrived today...elderly bun has spent most of the day sitting on it like a big fluffy pancake while crunching a carrot! So far the pigs are just looking at the snugglepad with a slightly look on their faces!