Gerbing (maker of excellent heated gear) has a portable A/C unit for moto cops. About the size of a toaster with a hose running to the cops vest.
When and if a civilian model is offered, I'm in line. It get's mighty hot on my afternoon commute here in Big D.
For now, I use a phase change cooling vest designed for road construction crews and housing roofers. It gives about 1.5 - 2 hours of cooling between charges.
