Are they Warm enough?

Dear Guineapig Lovers,
<> i have two baby guineapigs and as i live in melbourne, it can get pretty cold. I got my cousin to make me a cover that goes over the whole hutch but i was wondering if it is easy for guins to get cold or if they keep warm easily?
From
Lauren Gillanders

they get cold outside..really cold..they can get sick from being outside..I strongly recommend putting them indoors..then u could interact with them more and u can spot illnesses more quickly b4 the problem could get worse..I'd strongly advise that