Jersey, I got the footage screwed up; your number more inline (cannot find the exact footage in my paperwork yet). But this picture gives you an idea how much was sunk. I have a Carrier GT-PX Geothermal Heating & Cooling System (Two-Stage Puron Series)/ AG Series Electric Heaters and ClimateMater Programmable Thermostat. I found all that other data (the analysis stuff, etc but that is SO out of my league). I think we are OK for now other than the heat strips. I may do as you say and call the manufacturer direct. Thanks. d