I definately spend more time with mine in the summer. I have a shed for the quad (Frosty, Snowflake, Tessie and Daisy) and hutches inside an aviary run for the other two pairs. I waaaay prefer the shed for cleaning out, etc even though the runs have clear tarp over them to keep the rain out.
As long as they have each other they should be fine.
I dream of having a huge extension of the house (rented and no space for one but no harm in dreaming) where they can all live as a happy group of eight and where I can sit with them in the warmth ...