Ac while on the road

[bushpilot-TC]

Don I searched and came up with this:
Dash
20,000 Btu/hr (minimum)
Outside (fresh) air, Panel Vents
90 degF Ambient
in a big truck is what it said.

so the DASH Air puts out more than the roof top?? seems like it should be a lot cooler in the "house" than it is going down the road...