I just wanted to say thanks for the assistance on some of my questions as of late. Last night I "threw the switch" and brought the system online. 5 ton unit with 6x 3/4" 600' loops. Still need to fab a plenum and ductwork but I have 95F air coming out the top with my 2-pump FC running on low speed. For a previously unheated space, it feels great! One surprise was how quickly the small things added up. Brass fittings, wire, valves, etc. Now to pick up some tools to measure pressure and temp and optimize things.