I've been taking showers on the coolest setting (it's enough for me to *just* get goosebumps, but it's not freezing) and have been using ice-packs at night whilst watching TV.
After just 4 days of this, I can honestly say I AM BOILING HOT!!! Of course it doesn't help that I live in the tropics anyways, so getting cool is difficult at the best of times, but it has been almost unbearable unless I'm in full-blast air-con all the time.
(And I don't usually like having it on, and try and bear the heat as much as possible usually!)
I can't say that it's had any effect on metabolism, weightless, or anything else yet, but I am DEFINITELY feeling the heat.