From the first day I purchased my 3150 I've had A/C Problems!....simply put, it did not cool the trailer; even with 2 A/C units that were installed in the factory.
So, i lived with it...not happy.
last week i took it into a RV shop and they discovered that Montana had installed the A/C sensor in the bedroom 4inches from the unit so it never functioned correctly and therefore limited cool A/C.
Moved the sensor and
I've never been so cold!
I've written Montana and asked for reimbursement on this labor cost even though out of warranty. we can only hope since I wrote to them through our warranty period about this issue.