Joe:
Thanks for the info.

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When we purchased our bus the fellow that ran through things with me suggested that in the winter when needing heat not to put the switch in heat but always in the A/C position and with the thermostat set warm it will in fact give heat and the windows will stay defrosted better in this position.
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I haven't really thought about it but that sounds like a good to know item that could be used selectively. I do believe that the OTR compressor running just to heat the coach would result in more, and in most cases, unecessarily increased fuel consumption. I will use it for those early launches then switch back to heat only.

Good tip.

A thinky. The other morning I was running a cruise air just puttering around trying to figure some things out about it. It was around 35 degrees out side. The cruise air was putting out warm air. Do some of these units have an additional heat element in them?