Meredith about -17, Mitsubishi hyper heat, 5 heads, 42kBTU (2 years old). Monitored on the kumo cloud app from MA. This is for my 2nd floor, heads in 4 bedrooms and a large 40x20x10 room. Probably not a good comparison as the bedrooms open to a loft/great room and receives heat from the 1st floor which is oil boiler, hydro heat. I usually leave the 1st floor at 58 and 2nd floor at 60 but the heads in the bedrooms do not run much.
The large room (no heat from 1st floor) held 60 all night. As much as I like the system, I would have a backup plan. For us we have a propane wood stove in the large room.
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