Thank you for your question regarding the insulation in our units. The roof is filled with formaldehyde free spun glass insulation with an R-23. The side walls are 2" block foam insulation with an R-9 rating. The garage floor is 1" plywood decking however, we do not insulate underneath the garage because of the 30 gal. fuel cell, spare tire mechanism, etc. If you would like to enclose the garage floor and insulate it, you could do so if you wish. We appreciate your interest in Heartland RV and I hope we can find a way for you to join our family here at Heartland RV. Take care, Mike