[Greenbuilding] Manual J calculations and Geothermal heat pumps

[Stephen]

I am starting a house that will have geothermal heat pumps for heating and cooling. 

I am getting some conflicting feedback on sizing from two different subs. I would like to do Manual J calculations to test the numbers. Does anyone know of software available as a demo (or free) that will allow me to do this? I know I can purchase the software for $300 or more, but this will be a one time affair and do not want to pay for that. The demos I have seen will let you do 3 rooms or will not permit printing or saving - not terribly useful.

One of the subs is proposing Hydron Module as the manufacturer of the heat pumps. Anyone out there with experience with this brand - good or bad?

TIA

Stephen Levine