5 year old buck +
They make the mini split heat pumps now with a third line so that you can have Units running in heat mode and cool mode at the same time. This works well for instance if you have sunny south facing rooms that get real warm and north shady rooms that need a few degrees of warm And want to keep the whole house the same temp. However this luxury comes at a much higher price.
Interesting. Evidently this Mitsubishi doesn't have that....at least according to the manual.