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Originally Posted by hayden55
But I did compare the 30k unit and the 36k unit with the inverter and variable output capacity and the minimum cooling outputs. The cop on the 30k with the 121 W fan was 4.29 vs the 36k with the 431 W fan at 4.41. So it looks like our question about messing with fan speed has been answered. Never mess with fan speed leave it alone.
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I don't follow what you mean. The more expensive, supposedly more efficient system has a 3x+ more power hungry fan. Are those maximum values, minimum, or average? Does the cop take into account the blower fan power consumption?
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The main con to a ducted system is if they run through a non conditioned space like a hot attic you can lose a lot of heat or cooling as the ambient temp steals your btus on your duct runs.
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All the upstairs registers are in the floor, and all the downstairs registers are in the ceiling. The only thing in the attic is the upstairs return which is the ceiling. There's 4 registers fed through an unconditioned space in the basement that are insulated.