No heating!!!

My boiler has been broken for over 3 weeks now, so no hot water, no heating. It's early December in the UK and it's pretty chilly. My chinchillas don't feel cold on their bodies but their ears and feet are cold and I'm concerned, I can't exactly put the heating on for them till my boiler is fixed and they have fleece in the cage but don't use it. There are two chinchillas in the cage and they do cuddle up to each other to keep warm but is there anything else I can do?



Thanks