heatpumpfan

5 ms·

1.
by heatpumpfan 4y ago
It is not clear why your heat pump cuts over at 40 degrees if it still has COP of 2 at 8 degrees. Presumably a cost-effectiveness calculation if gas is cheap in your area. If you had heat strips instead of gas, the "cut over" temp
2.
by heatpumpfan 4y ago
Are you able to say more about that? "We will have local contractors" sounds great but in my area I don't think you will be able to find anyone to work with you. The local contractors and supply houses have closed ranks to fe
3.
by heatpumpfan 4y ago
You have an older system. New systems can provide 100% rated capacity well below freezing. Mine is -5F and not specifically a "cold climate" unit. The unit in OP seems to offer 100% nameplate capacity at 5F.
4.
by heatpumpfan 4y ago
Sizing heat pumps by the sq. ft. is hairy reasoning. Load calculations take into account climate zone, insulation, building materials, orientation, ceiling height, etc. Any recommendation based on 2D area is sketchy. For replacement of exis
5.
by heatpumpfan 4y ago
Refrigerant, pressure, vapor injection, and a highly "managed" vapor compression cycle.
6.
by heatpumpfan 4y ago
"Cold climate" air source pumps have been available for years. Even my cheap MrCool Universal has 100% output down to -5F and it is not even really a "cold climate" heat pump.
7.
by heatpumpfan 4y ago
>"backup heating strips" Big resistive elements sitting in the air handler. Think big toaster oven coils that are used when the outdoor temperature drops too low for the heat pump to handle the load.
8.
by heatpumpfan 4y ago
I recently purchased and installed a 3 ton MrCool Universal (Gree Flexx, I believe) with lineset for ~$4K shipped: https://hvacdirect.com/mrcool-universal-36-000-btu-heat-pump... Worked just fine during the Christmas arctic