Are they indoor/outdoor? And what type of cage? We had an indoor cage to start with but felt they had outgrown it so in spring we bought a huge double story hutch with thermal cover etc and moved them outside. However I'm now feeling so sorry for them now the weather is getting cold and they are not getting anywhere near as many cuddles. Im tempted to bring them in but dont really want to downsize the cage. Im also paranoid about foxes and if my dog barks in the night im coming down to check there isnt a fox getting them 
Im wondering how rediculous it would be to have them in the lounge (carpet so not ideal) or dining room in their big hutch. We also have a basement that I considered but there is no natural light/windows and only a very dim light at all.