Not sure which model you looked at but my Panasonic 12000 BTU heat pump I installed back in 2020 can easily works down to -25c.
My electric convectors haven't been working since then and I live in Canada and it can get pretty cold usually.
Considering 95.8% of the humain population lives outside the USA.... It's easy for Americans to forget they're actually a minority in the world because math is hard!
Not sure which model you looked at but my Panasonic 12000 BTU heat pump I installed back in 2020 can easily works down to -25c. My electric convectors haven't been working since then and I live in Canada and it can get pretty cold usually.
The latest models are even more efficient.