Hi Brian nice to hear from you, the system is working great at these temps and it amazes me how much heat this thing is capable of producing at -5 to -10. I am heating the whole house(ex. basement) with the heat pump and a small 1000 watt heater.
The AC portion is 21 seer and from what I was told there is no comparison in this 1.5 ton unit compared to a regular central unit, all the other central ac units I had had the same problems freezing cold basement,okay main floor and a warm second floor and in the case of my previous house a loft that was so hot you could not stay in the room in the summer.The Mits will be pushing the air directly to the room no duct work to worry about.
The unit is very quite and I think it will prove to be a good investment.
Take care Brian