well over the last few weeks i have kept my ferrets inside, just my 2 working ferrets the other 3 are outside and have been for months, but anyway the 2 i got the cage i got them in was designed for indoors and being in a garage so when i got it took me a while to cover it in the same stuff the shed roofs are coverd in. also the cage didnt have a specific bed it had a hammock which they slept in. while i had to take that down, i bought a ferret box as there bed took the strap off cut out a hole in the front where the ventilation holes were, stuffed it with newspaper and bedding and secured it