Heat pump 1 outside unit or 2?

We’re getting estimates for mini-split heat pumps for our 1970’s split level. We have two proposals, each for two heads, 1 on each level. One contractor is proposing a multizone… We’re getting estimates for mini-split heat pumps for our 1970’s split level. We have two proposals, each for two heads, 1 on each level. One contractor is proposing a multizone…Read MoreGreenBuildingAdvisor