I have our rabbits in the garage right now. It stays closed during the day (dogs) so there is no ventilation. I do have a fan blowing on them though. Anyone had issues keeping rabbits in a garage?
I don't, but mine are in my basement for now. So long as the garage doesn't get hot, it should be okay provided they have good air quality and some ventilation. Is there a window you can crack for them?
My previous rabbitry was in a garage and I had no problems with ventilation as it had been set up as a paint booth before I'd bought the house. Ironically, the drafty old garage I had them in before i bought the house gave me nothing but grief regarding ventilation.
I'd recommend putting in a 'whirlybird' on the roof or an air exchanger in a wall