Nice morning.
WRT to the mini-splits, I have them in both Westborough and Maine. They're more effective at cooling than heating. I'm not certain about this, but I think that's due to where they need to be placed--high on the wall. When cooling obivuosly the cool air wafts down toward the floor. when you're trying to warm the space, it tends the warmth has to work it's way down to where you're standing/sitting..
They're still a good solution, but know that the cooling is more effective.