I would agree with that assessment, Cassie. As long as these machines are designed to be reversible, they will not be optimized very well for either function. From what I've seen of air to air systems, they seem optimized more for cooling than heating, but that's just my view. Anytime I come across a multi-tool, I find it convenient, but rarely as good as a box full of individual tools.
My preference is to focus on the application I desire the most (usually heat), and build from there. I'd prefer to leave the reversing valve BS to Trane and Carrier. If I want AC, I'll build a special system made specifically for that.
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