To answer your question, I need you to specify both the temperature ranges (high & low). Still, I could give you a short list based on my assumptions.
High temperature - Xceltherm MK1 (400ºC), Duratherm 600 (121ºC - 315ºC)
Low temperature - Xceltherm CF (-64ºC to 65ºC), Duratherm XLT-120 (-84ºC - 65ºC), Xceltherm 500 (-60ºC to 260ºC)
If you have any trouble with the aforementioned fluids, just get back to me.
more on "high velocity hot air impingement techniques for transferring energy"?
Duratherm Extended Life Fluids
800 446 4910 ext 111