This is experience from S.C., a much different climate from yours, so take it for what's it's worth: Last week we had below freezing temperatures for 3 or 4 consecutive nights. Daytime temperatures were cool with a strong breeze. Most of my maples had already leafed out and were actively growing. I put what I could into an unheated shed. They stayed there from Monday evening until Friday afternoon. A number of "science projects" remained outside due to lack of room. The trees in the shed were fine. The maples that were outside all suffered from some dessicated leaves, whether from cold, wind or both I don't know. No other leafed out species (elm, Chinese quince) had similar damage.
Maples are relatively cold hardy. They're probably are reacting to the lack of humidity, higher temperatures, and lack of air flow that occurs in a house. It's been weird weather this winter for all of us in the U.S. Aml1014 has good suggestions, but they will be at their best if you can find a way to keep them outside.
