Well you certainly need to do something quick! If you were to put them in your bathroom I would suggest cleaning it with Chlorahexadine. I use this to clean all the cages as well as any bathroom areas when someone is sick in the house.

I would though recommend talking to your apt. mgr. in regards to the window. They should be able to fix that. Also if they are paying for heating why not crank it up a bit?? Our house is at a balmy 76-78 degrees. Its like a nice summer day....lol. I would rather pay for the heating bill as opposed to the vet bill. Not to mention the fact I am rather over the top with my babies..