What outdoor insulation can I use for animals?

I live in an area where there are several cats who have been abandoned by their owners, and while I would love to take them in, I simply don't have the room or money to care daily for each one. Regardless, I love animals and worry for their health now that below freezing temperatures are coming around. I also... show more I live in an area where there are several cats who have been abandoned by their owners, and while I would love to take them in, I simply don't have the room or money to care daily for each one. Regardless, I love animals and worry for their health now that below freezing temperatures are coming around. I also already have two cats, which is about all I can afford to care for right about now. I considered keeping the outdoor cats inside my place just until the freezing weather passes, but several things could go wrong with that. The cats could get too attached, they could spread fleas and other things around my home, and so on. That was why I thought it might be a great idea to set up some sort of insulated temporary home in the general area for them to retreat to when it gets too cold. It would be a more indirect way of helping the poor things. Is there anyone out there who has outdoor pets or has dealt with similar situations that can give me advice on what to get for them? I don't want anything that they'll get tangled up in or ruin too easily, and it has to be large enough to fit several cats in.
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