Interesting findings there with the fan experiments, I had a little play with my S9 today in regards to ducting cold air to it from outside. That dropped the fan speed down to almost pleasant levels.
Finding a reliable source of cold air but keeping it simple will be a challenge.
Was thinking about setting up in the loft but that gets hot in the summer so would mean ducting in air from outside and that will mean holes in roof
Ducting in air from under the house would be nice but that means the miners would be down stairs
Damn it I need a new house.