The house that we've been in for about two years now has a Fujitsu system. It has units in the living room/kitchen area, in the main bedroom, and in the lower, ground floor level. Up until this past winter, absolutely no complaints, but we really only used them for cooling. When my girl's parents came up to visit in colder weather, we'd crank up the one in the downstairs area for heating that space, and it maintained the set temperature just fine. This year it doesn't seem to be able to heat efficiently. That downstairs unit will blow out cool air and not really move the temperature up above low 60s in that space. I'm hoping that this is just a simple thing like needing more refrigerant, or whatever it is they pump to generate heat. Any ideas from those more knowledgeable?
I will say that these units (one outdoor unit feeds all three) have been amazing otherwise. Cool amazingly well and are nearly silent, which is great.