Ford Tourneo Custom L1 rear air conditioning necessary?

Hello everybody, we are about to decide to buy a Tourneo Custom L1 from 2017. But: This one doesn’t have air conditioning at the back. I’d like to have an assessment of people who only have air conditioning at the front: Is this suitable for everyday use? Is the climate sufficient to cool off the rear? We have two children who will ride in the back. Thank you!