I live in the South were heat pumps are most economical for cooling and heating. On new construction that I've built, I'm at the stage where I just about have to figure what type of heat pump system I'll need to install. Local expertise is limited to standard housing, standard heatpumps, exchangers, blowers, and ductwork that is is fine for a regular house with attic but dumb for my application. I've built within a metal barn. Square footage is about 1000 to 1100 ft. 800 first floor, 200-300 on upper floor. I'm super-insulating with far more insulation (foam for air infiltration, batting for greater R value) than is used in the South. I figure I'll have about and R-40-50 envelope. I have heat gain from 2 insulated windows (with thermal breaks in the window frame) that measure only 36" by 28". Bathrooms are vented to reduce humidity and there is a hood over the cook top to reduce humidity. 6 people residing. How do I size the heat pump to get correct run time to produce cooling AND dehumidification? 1. What types of package (I install and charge) heat pumps are available at this size? 2.Other than the big, poorly insulated, commone sheet-metal ductwork for attics in standard housing, what type of reduced size easy to install, perhaps high velocity duct work is available? I see all sorts of stuff on the internet, including separate heat exchangers for each room, etc. But none is used in this are and nobody has any experience with these. Thus, I'll have to insall myself. Suggestions?