We recently moved and our new [to us] house has a two-car attached garage. We find it very convenient, especially on those -40 degree days. I put an overhead unit heater in and we keep it turned down to above freezing and we keep our freezer and extra fridge in the garage, along with the treadmill.

Our previous house had a two-car detached garage. It also had an overhead unit heater and we used it in much the same way. One advantage to a detached garage is that if you use it as a shop and have a mishap such as a fire, you don't burn the house down. That is not a consideration for you as you don't plan to use it as a shop.

Overall, we like the convenience of attached, especially given our climate.

Thanks bobbymac - Location might of been helpful also (N. Florida). I think the convenience of being attached is what we want. The storage room above will be conditioned so being attached makes that easier. Can't imagine it being that cold. It was 30 this morning and I was freezing.