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Unico system vs forced air
I can't comment on many things about hi velocity systems but the comment about being more efficient got my attention. One knock on hi vel (besides the high price) is they are not more energy efficient. I've found it very difficult to find tables listing the seer and capacity ratings with different condensing units. However if you can find them you will see that you have to use a 12 seer outdoor unit to get 10 seer and you usually lose capacity. ie with a 3 ton condensing unit you get maybe 31,000 btu.
For new construction I personally don't see why you would go with hi vel. For less money you could get a variable speed blower and a true 12/13 seer.