Well the girlfriend and me have reached a compromise. I put a draft blocker against the door crack. This will not solve the problem entirely due to the central air and heat system in place, but on the warmer winter days I can crack the window in their room open. She continues to complain about them just being in our unit. My parents have offered to let me move them back to their place but she doesn't like that idea.....
Anyway regarding colds and flu, I was told by the exotic vet that chins are immune to human cold and flu. They certainly did recommend not coughing on them though.
One night girlfriend comes to my workplace and tells me Bonnie was barking so she went in to investigate and she is sprayed with urine. She then grbs Bonnie and holds her while she is squeaking. I took her to the vet the next day and was ok physically. Just emotional trauma. She's doing better now but growled last night when Rachel came into the room. Raisin just recovered from conjunctivitis, but aside from that all chins are happy and healthy. I just filled their stockings this morning