Quote Originally Posted by Jerry Winchester View Post
So I finally found a place to load test the roof AC units. We have been traveling down I-10 from Houston to I-8 and on to San Diego.

Out of Houston on Sunday evening, we ran the dash air and two ACs on inverter and it was plenty cool.

Started with that Monday morning and ended up with the generator on around Fort Stockton with the OAT around 97.

Started this morning in Las Cruces with the generator and 4 ACs and hit Tucson at about 104 and still cool.

Now we are between Gila Bend and Yuma with the OAT at 112. Dash AC is on high as are the 4 roof air units. The roof airs are running a 14 to 12 degree delta between inlet and outlet and holding the front of the coach around 77. The galley / rear is 73. The sun is shining in the front quite a bit.

The roof on this coach is not coated which I think makes a big difference.

I never had our OTR air coach out in this kind of heat but so far we have made it thru the heat of the day pretty comfortable.
Jerry,

Your post mimics how my systems work in extreme heat. However, I have found that if I lower all my salon window shades, I notice a significant decrease in the heat load from the outside. During a run through Forth Worth with 105 temps, I lowered my shades and the roof airs started cycling.

Such a simple thing as lowering the shades reduces the heat load inside the salon area significantly.

Also, I have installed an insulation product on my roof. I can not remember the name of the product. I am currently on the road, when I get home I will look up the name from one of the leftover cans.

I can't tell if the coating or the lowering of the salon shades enabled the roof airs to cycle during the high heat.

Hector