Half year 200km commute, then family car

Dear forum, in February I will start a new place, which is 200km away (mostly motorway). For family reasons, an immediate move is not an option. However, we (family with a child) would then move to the place of my new place in the summer/autumn if everything fits. First I would commute however, if necessary I will stay two nights a week at the place of the new place. We have saved almost 7000 EUR. The place is very well paid, I would all of this Gs hate to be in debt. Air conditioning would be important. At the moment we do car sharing and drive there mostly a Ford Fiesta. I could imagine commuting with the car if necessary, but the trunk is too small for family use. What would be good options for me here? Thank you!