Thanks for your reply and I am trying to learn as I go, along with the contractor. I think hybrid systems are fairly new to this area as 3 out of the 4 contractors I had come out said that they had heard of heat pumps but weren't familar with them. The contractor I hired has the most experience in this area with heat pumps but is still learning. The Evolution thermostat does not calculate the best balance point but has a lot of other nice features as far as I can tell being a newcomer to this field. I will see if I can track down the LoadCalc software.