You can still put them outside to live in the summer but they should have good housing. I'm sorry but a rabbit hutch just is'nt big enough. Even putting them out now in the day and taking them in at night is no good, its way too cold for them at the moment. Cockatiels need a lot of space so they can get exercise flying about and keep their muscles in good shape. Why not just leave them living indoors and let them out in the room each day for a fly around? Anyway, here is a pic of my aviary which is attached to the shed behind which houses their indoor flight.
