With 96% efficient natural gas furnaces I don't see there being much room for improvement for the complexity of running an engine to drive a compressor for the heat pump cycle. Gas furnaces are reliable because its a very simple concept, fire and hot air. It seems you are considering this more for cooling and reducing your electric usage or in lieu of electricity. It might make more sense to use a NG powered generator to run your hvac. And try to capture the exhaust heat into hot water. The york units had briggs and straton motors. I don't think these motors were considered efficient. From a technician's stand point I wouldn't want to repair a york triathlon, sounds very specialized and proprietary.
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