I agree with Minimac The cooled pex with aluminum spreaders may at some point reach the dew point and rain on the ceiling wall board. Not good. If you have the space open, run ducts and drop vents from the ceiling. Install a air-handler. Some have the ECM fan multi speed that's very efficient. They are nearly silent. From your heat pump circulate the chilled water through the HX and the cool dry air will fall from the ceiling vents and condition your space with little striation. The added bonus to this is during winter heating season you can circulate hot water through the air handler for quick boost of heat as the floor will be slower to respond and heat the area. Or add some solar hot water panels and have FREE HEAT.
We have been living with this type of system for 6 yrs. and highly recommend it. Been there, Built it, Did it, Can say it works extremely well!!
Randen
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