My bikes are all in the basement too for the season. With the exception of my son's bike. Since I put a 3 wheel/stablizers conversion on his bike, it will no longer fit through the doors to go in the basement. His bike will have to sit in the garage all winter.
I'm actually looking forward to working on my bikes in the basement this winter. Its nice and warm with cable tv. I think I get more work done to the bikes in the winter than during the summer.