We have 2 Dometic 13.5 btu units that we only used about 10 times last summer.
We have a big truck with a ton of equipment. The hottest it ever got to the touch on the ceiling was 98 degrees. Other trucks were hitting 130+.
The key to keeping our truck cool was the use of multiple materials to insulate the walls and ceiling. Along with an air gap, I used foil backed bubble insulation, rigid foam board and 1/2" plywood. This has a finish cover of stainless steel.
We open the window and turn on the vent. All the cooling we need 90% of the time.
On the flip side...to keep heat in,
I used rock wool and cement tile underlayment to keep the heat from the cooking equipment from getting thru and possibly damaging the vinyl wrap on the outside.
INSULATE. INSULATE. INSULATE...!
post edited by MurphyR - 2014/02/08 16:40:40