you'll defently want to have a light on during the day.
if you get a timer for your light that would be good because then you won't have to worry about remembering to turn it on or off.
and like BethySue said make sure to have nice warm pouches
if you find it gets REALLY cold, maybe think about getting a space heater? (i believe you could probably even get them at wal-mart.. they sell pretty much anything lol)
if you move your critters to the basement just keep a close eye on them for the first few days for sure. if they're showing any signs of stress try to narrow down the reasons for it (lighting, temperature and so on)
i think as long as you have control over the environment (as it sounds
you're planning on doing) it should be fine and it sounds
like you have a wonderful husband to do all that for your little ones!
best wishes and take care