Ive got a backwoods with 1" of insulation and it flat out doesnt care what is going on. had it running at 9 below multiple times this winter. the MJH has 2" and Im possitive it wont even notice the weather either.
any insulation is 100x better than none IMO. 2" is a heck of a lot
Humphrey's BB'cube-Weber Genesis 330-Weber OTP