Rear Cabin Heater

[navajoflyer]

Does anyone have any experience with a rear cabin heater for the Chieftain.  Who has the STC's, what does it cost, is it worth the money?  We presently have two Chieftains that have cuff heat on the left engines.  I am  wondering if I should try putting the cuff heat on both engines or just go ahead and put a rear cabin heater in.

Thanks.