[DanBC]

From my very limited experience SF is not that humid, yet has a lot of AC.

Things like painting roofs silver or insulating buildings are great starts to reducing AC use. (Dark roofs can reach 66C to 88C in hot weather, better roofing helps a lot. (http://www.epa.gov/greenhomes/ReduceEnergy.htm#advhome))

But this? I'd freakin' love to try something like this. I'm almost always too hot, even in England.

[ollysb]

I can imagine this being great for the winter in england, you're always moving between hot/cold environments.