We have two daikin 15k high walls and they have worked great. We also have a 24k Samsung that has been working great. Samsungs suck in reliability and service/parts so I’d steer away, but it was free leftover for a job so it went in our shop.

That said, when it’s below 20 or so we run our wood stove. Based on the submittal sheet they should heat our place sufficiently down to about -10f, they just won’t be efficient while doing it.