I can't really agree with the previous 2 posts. Not that I like or recommend a career in residential. In a lot of markets that's simply where you are going to start. Either little or no industrial work in the area. I think it's a good place to start and if you like it stay there if not you have gotten some experience and can take the next step up into refrigeration or light commercial. Hard to jump into commercial/industrial service or commercial refrigeration as a tech. Most apprentiships will have you doing install or fab work and that can be a black hole from which you may never escape. If you have the aptitude a couple years in residential service will show it and doors will open to move up quickly.
I would agree that residential would be a good way to enter the field. But try to get out as quick as possible.