See perhaps the "Cold Climate Air Source Heat Pump (ccASHP) Product List and Specifications" from the Northeast Energy Efficiency Partnerships (NEEP): * https:

See perhaps the "Cold Climate Air Source Heat Pump (ccASHP) Product List and Specifications" from the Northeast Energy Efficiency Partnerships (NEEP): * https://neep.org/heating-electrification/ccashp-specification-product-list https://neep.org/heating-electrification/ccashp-specificatio... And their product list: * https://ashp.neep.org/ https://ashp.neep.org/ One of the search criteria is their rated capacity (BTH/h) at 5˚F. A 'proper' installer will figure out the energy you need for the design day in your area: * https://www.greenbuildingadvisor.com/article/design-temperature-vs-degree-days https://www.greenbuildingadvisor.com/article/design-temperat... If you're in a really cold area (IECC Zone 7+), then a dual fuel system could be one option: * https://www.carrier.com/residential/en/ca/homeowner-resources/hvac-glossary/dual-fuel-heat-pump/ https://www.carrier.com/residential/en/ca/homeowner-resource... * https://www.lennox.com/residential/buyers-guide/guide-to-hvac/glossary/dual-fuel https://www.lennox.com/residential/buyers-guide/guide-to-hva... * https://www.trane.com/residential/en/resources/glossary/dual-fuel-heat-pump/ https://www.trane.com/residential/en/resources/glossary/dual... Of course before you go spending money on equipment, it's probably a better ROI on better air sealing / draft elimination and insulating. Once you're not leaking (as much) heat then you may need less powerful equipment to keep indoor conditions comfortable.