2 ms·

It depends on the heat pump. If you get a mini-split, and have decent insulation, they can work down to -20C: * https://www.mitsubishielectric.ca/en/hvac/profe

It depends on the heat pump. If you get a mini-split, and have decent insulation, they can work down to -20C: * https://www.mitsubishielectric.ca/en/hvac/professionals/fs-series https://www.mitsubishielectric.ca/en/hvac/professionals/fs-s... * https://www.mitsubishicomfort.com/articles/what-is-a-heat-pump https://www.mitsubishicomfort.com/articles/what-is-a-heat-pu... * https://www.fujitsu-general.com/us/residential/benefits/year-round-comfort.html https://www.fujitsu-general.com/us/residential/benefits/year... Some folks using them in Alaska: * https://www.nrel.gov/news/features/2021/even-in-frigid-temperatures-air-source-heat-pumps-keep-homes-warm-from-alaska-coast-to-us-mass-market.html https://www.nrel.gov/news/features/2021/even-in-frigid-tempe... If you get a heat pump that looks like the 'traditional' external AC unit (giant cube), those tend to work down to about +5C. Not sure how much more they cost above a 'regular' air conditioner: * https://www.lennox.com/products/heating-cooling/heat-pumps https://www.lennox.com/products/heating-cooling/heat-pumps The Technology Connections channel has a couple of interesting videos on the topic of heat pumps: * https://www.youtube.com/watch?v=7J52mDjZzto https://www.youtube.com/watch?v=7J52mDjZzto * https://www.youtube.com/watch?v=7zrx-b2sLUs https://www.youtube.com/watch?v=7zrx-b2sLUs He has a video entitled "How to calculate when heat pumps make financial sense (and other heat pump follow-up thoughts)": * https://www.youtube.com/watch?v=BRdq2ExLJns https://www.youtube.com/watch?v=BRdq2ExLJns NR Canada has a "AIR-SOURCE HEAT PUMP SIZING AND SELECTION GUIDE": * https://www.nrcan.gc.ca/sites/nrcan/files/canmetenergy/pdf/ASHP%20Sizing%20and%20Selection%20Guide%20(EN).pdf https://www.nrcan.gc.ca/sites/nrcan/files/canmetenergy/pdf/A... Financially speaking you're going to have to break out a spreadsheet and plug numbers in: (natural) gas prices, electricity prices, efficiency of the units, etc. Doing a search for "heat pump calculator" may get you started.

hedora 5y ago
Page 10 has numbers for current market leaders: https://www.nrel.gov/docs/fy11osti/52175.pdf https://www.nrel.gov/docs/fy11osti/52175.pdf I walk through the "what's the break even temperature" elsewhere in this thread (where I pasted the same URL). Also, it is kind of a moot point. If you're putting in central air (not a minisplit), it will probably automatically fall back to natural gas or resistive if it gets too cold outside. (Too cold should be something like -5F or less, assuming it falls back to resistive.)

hedora 5y ago

Page 10 has numbers for current market leaders: https://www.nrel.gov/docs/fy11osti/52175.pdf https://www.nrel.gov/docs/fy11osti/52175.pdf I walk through the "what's the break even temperature" elsewhere in this thread (where I pasted the same URL). Also, it is kind of a moot point. If you're putting in central air (not a minisplit), it will probably automatically fall back to natural gas or resistive if it gets too cold outside. (Too cold should be something like -5F or less, assuming it falls back to resistive.)