Where is a quote from an interview with a gondola manufacturer addressing this issue...
"Since the air conditioning topic just won't seem to go away, I recently came across the below as part of an interview with the CEO of a Doppelmayr competitor (translated from French.)
> What is the Sigma solution for combating heat in the booths of urban appliances in a hot environment? Is the dream of an air-conditioned cabin feasible?
-Currently the simplest solution is ventilation. We are lucky to have a vehicle that moves, so we find easy ventilation by creating a flow of air in the cabin. We have done extensive studies on the airflow in our cabins to maintain an equivalent temperature inside and out. We also tested in climatic chambers and we found that with our ventilation system we never had more than 1.5 degrees of elevation inside the cabin compared to the outside, despite the people on board and despite the solar radiation.
Then, we are looking for other solutions. The difficulty is not to cool a cabin as such. We know how to do it, in the context of ferris wheels, as soon as we have energy. With electric power, cabin air conditioning is easy to perform. Our difficulty is to bring energy to the moving vehicle. We work on different research and solutions. "