The highest ambient temp I have operated OTR and Cruisairs in is 117 deg. and that was coming out of Palm Springs in late June. The OTR worked well, but I had a weak circuit breaker in the condensor fan unit that shut it down. There is a whole thread on here somewhere that discusses that deal.

So I fired up the generator and turned on the Cruisairs. As Jon relayed in a earlier post, the Cruisairs sucking that hot air off of the blacktop didn't last long as they were HIPSI or some other issue and they started falling off line.

The last trip thru PHX at 114, the OTR worked fine, but I did have the shades lowered about half way to keep some of the direct heat out.