Their cage should be protected from drafts. Don't place the cage on the floor under a window or air conditioning vent. Remember that they wear a fur coat all year and a comfortable temperature for people may be too warm for a rabbit. They can be destructive if allow to roam unsupervised. They should have a cage and should only be let out to play when someone can keep an eye on them.
Garages are the worst place for a bunny unless the door is wide open at all times.
A closed garage is stuffy most of the time and gets frequent drafts under and around the doors which can cause respiratory illness. Offer shaded protection on the west and south sides at all times and a wind break on the north in the winter. The sun on the east side on mornings not exceeding 70 degrees is generally enjoyed by the bunny. Make sure the roof of the hutch is sloped to allow the hot air to escape. A flat roof can trap deadly heat.