I'm not going to defend the design of the Cruise Airs. But if they are properly charged with R-22 they will function quite well when parked because the bus is shading the ground and if the baffles are correct and in place the hot discharge air is carried away from the cooling intake air. Anyone that has serviced Cruise Airs however will attest as little as an ounce of R-22, one way or another has a disproportionate impact on performance. But when they are working right they are very good.

If you are experiencing problems Greg, the first step should be to make sure the hot air discharge is directed away from the intake otherwise the exhaust air is redirected back through the condenser where it gains more heat and this circular air flow causes shutdown.