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• 21:04, 18 July 2023 Tim talk contribs created page Cold-Climate Ducted Heat Pump (Created page with "==operation== ===how is it different than a fossil fuel furnace or boiler=== Fossil Fuel furnaces operate at high temperatures and fans speed. You can feel the hot air blowing out of the vents. Cold climate heat pumps, like most highly efficient systems, don't heat the air (or water) to such high temperatures. Old style boilers and furnaces have 2 states, off or on full blast. Cold Climate Heat Pumps have Variable Refrigerant Flow (VFR), the compressor and refrigerant r...")