Energy efficiency of multi zone mini splits vs. multiple single zone?
Having a dispute with my HVAC contractor, hoping the smart people on here can shed some light. For a given heating load size, would 3 higher efficiency single zone mini splits use more or less electricity than 1 multi zone system?
For example, we are contrasting a system that uses 3 Gree Sapphires (9k, 9k, 12k). These supposedly have COPs of 4.47 (for the 9k) and 3.8 (for the 12k) whereas a 30k 3 zone system has a COP of about 3.3.
My thought is that I have a certain amount of heating load and I want to meet that load using the most efficient equipment possible at rated capacity and also have the most flexibility to run mixed loads – thus I conclude that the 3 single zone systems would be more efficient.
My HVAC guy insists that the modern multi zone systems operate at variable speeds and that powering one outdoor unit would save electricity versus powering three.
Which one is right? 3 heads on 3 condensers or 3 heads on 1 condenser?
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