We've got two ductless head units on a 24k condenser for a 1200sqft townhouse. Got them installed primarily for the AC, but we ended up also using them for heat as well. I run them in conjunction with gas powered baseboard heat.

I've used them exclusively for an entire month in the winter while getting our furnace replaced, they were more than up to it. They're super efficient during the late fall / early spring for heat, and during this halfassed fake winter too.

I like using them for heat because it provides a nice warm breeze, and it brings the house up to temp in the morning way faster than baseboard can. Warm air moving around makes the whole place seem cozier. They help circulate the warm air from our high ceilings down too.

The AC is immaculate, keeps this place ice cold all summer.

Install process was super fast and non-invasive, day and half at most.