u/New_Elk_5783

The temperate 5 miles up in the air is very cold. So we have a lot of free cold air up above. We just need to pump it down to the surface and we get (practically) free AC.

A few points of consideration -

1. The pipe needs to be very insulated so it doesnt absorb heat from the surroundings

2. The pump needs to be strong enough to pump air from low pressure at the top to high pressure at the bottom.

3. The pipe needs to be strong enough to witshtand its own weight, wind, temperature changes, natural disasters etc

From reading online, I notice that even super small EVs like the Renault 4 or Chevy Bolt get about 3-3.5 mi/kwh effiiciency at 75 mph, which is not much more than bigger EVs like the Equinox EV, bZ, Ioniq 5 and even lower than sleek sedans like the Model 3. Why is this the case?

I understand that their drag coefficients are not that great, but shouldn't it be counteracted by the smaller frontal area and much lower weight?