Originally Posted by Pnutty
Thanks very much @hamskoolie. The unit mounts on the roof/outside. I have a mini split, yet to install, looking for driver AC while driving. Thanks for the response.
We're doing two 9000 BTU mini splits. One in the bedroom and one centered over the windshield. Either is rated for far more space than the inside of a 40ft skoolie.
The one over the windshield will be used while driving. IF (we don't anticipate due to door remodel and spray foam) there is too much air exchange with the outside while underway then we will hang a curtain to retain cool air in the driving and Pax area while underway.
9000 BTU should cool 400 SqFt in a home...with 8 ft ceilings. That's 3200 cubic feet.
Our skoolie will be 7.5ft wide and 39ft long with about 6'3" of headroom. So 7.5 x 39 x 6.25 is 1828 CuFt..... But then you have to adjust for four wheel wells, the rear engine compartment, etc. but let's just go 1ith 1825CuFt to make it kind of simple.
That's only 57% of the space 9000 BTU should take care of. But it's a long way from the front to the back so we went with one at each end for some redundancy as well as to allow the front to provide cooling while driving and the rear to cool the closed off bedroom with ease in even the most severe heat.