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Message: [QUOTE="OceanDoggie, post: 4815121, member: 12797"] I'm not HVAC tech, but am a proponent of Heat pump and the compressor of refrigerant technology. It's been around for a very long time, and most of Europe and the Middle East uses them. I think the aesthetic has stumped its market share in the states, but it's a proven commodity. The two largest Manufacturers (One in Japan and the other in China) make units designed to operate as low as -23 Fahrenheit. That said, I would certainly maintain the backup heat source solely due to the elements and that the unit must be outdoors for the science to work. Geothermal sourced heat pump is also an option which is probably ok to operate without a backup but the barrier to entry is extremely high and complex. [/QUOTE]