[jeff5may]

Are you going to be using this contraption as a heater, cooler, dehumidifier, or all of the above? If your existing gshp is providing too much cooling, you could run into the same problem with this. Of course, you could run a desuperheater on the condensing side of whatever you build. This could give you domestic hot water or rewarm the dehumidified air stream. The possibilities are endless at this point, while the rig is still on the build process block.