We recently moved from PA to the warm and sunny NC, and I am glad that we finally found a house that we will be moving in to sometime in the next 30-40 days. Since it is difficult to find homes with basements in this part of the country, I had to find one that would allow me to have a workshop, and this one does since it has a standalone garage that is separate from the others. It'll be cozy compared to my unfinished basement in the old house, but I'll make it work!

I'll have some work to set it up as a shop, and one of the first things would be to HVAC it, and therein lies my question: while I am not certain, I assume it is unlikely that the garage is insulated and since it is already finished, I am not sure how to insulate the outside walls. I figure the ceiling would be easy since there is an attic above it, but not quite sure if there is an easy way to insulate the walls. My immediate thought would be to somehow inject expandable foam through a number of holes in the walls, but not sure if this is possible or there is a better way.

Any thoughts?