Need recommendations for air sourced cold climate heat ...

I am hoping people can recommend air sourced cold climate heat pump, centrally ducted. Brand, model, or series that don't need gas or electrical assistance when temps get down to the single digits Fahrenheit or have problems cooling in the mid to upper 90s. I've seen manufacturers claim their heat pumps are ok at those temps then find that contradicted in reviews for them. There are some good resources on specs to compare heat pumps. But those are the numbers reported by the manufacturer which might be overly optimistic, especially after reading reviews on a few.

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Likely Enhanced Vapor Injection (EVI) heat pumps unless there is another technology that is doing the large temp range. Variable speed I would guess to be best so higher outdoor temps don't get too much heat and cause it to cycle too often? I've seen it mentioned about good firmware that detects and handles issues, for example reduced refrigerant flow at lower speeds, recognizing that and raising the lower limit, etc.

Reliability is also important. No use getting a high efficiency system that you have to get fixed over and over. Better off getting a standard system in that case.

Good website for comparing systems,

https://ashp.neep.org/#!/product_list/

The company is the world’s best Climate control evi heat pump manufacturer supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

Probably a good post for Canadians to chime in on. If I can get a few ideas I can research them and see if they have installers in the area who aren't horrible (like most contractors in north east NJ).

We are building a house with a 17&#; height limit. We want to put the heat pump on the roof. If we use an outdoor unit above 2&#;4&#; in height, the city won&#;t let us do it. Has anyone found a short air-to-water heat pump or a way to convert a refrigerant-based heat pump to be air-to-water[A]?

Regarding off-the-shelf short air-to-water equipment, I have found:
1) the Mitsubishi PUHZ-SW50VKA-C200 seems like it would be perfect. However, I have no idea how to import it from New Zealand, where it is marketed
2) Daikin ERLQ018BAVJU is 735mm (29&#;) but probably cannot be installed in the US.  There is also a July 16, press release from Daikin launching a 770mm &#;New Daikin Altherma 3 M&#; in Europe.
3)  &#; not much else yet
4) indoor units like the Stiebel Eltron WPL 09 ICS classic. Not exactly what we&#;re looking for, but I had a hard time finding something like this for a while.

[A] converting air-to-refigerant into air-to-water is discussed in another thread. It really doesn&#;t seem complicated to hook a plate heat exchanger (with traditional refrigerant on one side and water on the other side) up to any old heat pump, but I can&#;t tell if people actually do this or if it&#;s crazy DIY territory that voids warranties and sends HVAC technicians running for the hills. https://www.greenbuildingadvisor.com/question/air-to-water-hp-with-mitsubishi-components

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