Re: Overselling it
you don't treat the possibility of no aircon by having no aircon
Why not? If you can build an appropriate solution without resorting to forced cooling, that's an awful lot of saved cost, weight and potential problems. A bit like insulating your house. Do it properly and you can get by in a typical British year with ambient heating (incidental gains from sunlight, body heat, appliances) in the winter and ambient cooling in the summer.
A typical British house however needs dozens of kilowatts of heat for six or nine months of the year.
Think about graphics cards without fans, underclocked processors, SSDs instead of spinning rust, 'industrial spec' (or even military spec) components instead of 'commercial'.
No idea if any of these techniques are used (loss of computing power comes to mind) but if you can get by passively, why not do it?