Mudley007 I promised to get back and I am. I am glad to hear about the sys config issues that we think are fixed. I hope so. Yes t-stats make a HUGE differance in how a geo or non-geo system works..In fact IMHO controls and stratigies for controls are at least 35% of new owner issues. Let's think about what we want the system to do. Keep you warm. Work as promissed. Be reasonably priced as to cost for fuel to keep you warm and work as promissed. Did I miss anything? To get all three things to happen we want to use the lowest cost sorce of heat. The geo heat pump comes to mind. WF in their rating tables for the wrost your new equipment will do at an EWT of 31*F at 11 GPM is 31,000 BTUH and it will do that all day long, 24/7 at a COP of 4.7. What does that mean? For every $1.00 you send the electric company your new heat pump gives yo $4.71 in heat. That is a great deal in the dead of the coldest winter. We want to take all of that we can get. Now what? 31,000 BTUH is not enough. We need 54,000 BTUH according to the geolink PDF. So we are short 17,000 BTUH. Well look it up or trust me at 240 VAC 10 KW of strip heat is 17,000 BTUH. That in my thinking is a tad close to real design, but accurate just the same. There is no room for emergancy heat as your system is set up. On the other hand the house was OK but expencive while running on the strip heat only. Lloyd has his points that I will grant in theory. Joe and I have holes in our checkbooks from misstakes. I might up-grade the strip heat to 15 or 20 KW and see how she cools.