I understand that you size the whole system (Loop and HP) for your requirements. But what if you have 24K BTU heating requirements (2 ton) and a loop field designed for that load, only you find a deal on a 3 Ton system? The 3 ton unit has the potential to move more BTU, but you still only have 2 ton BTU load, thus the bigger heater will still require the same load of the loop field (since all your really doing is moving BTU and the heat sink is the earth). I figure since the loop is undersized for a 3 ton HP, it would draw down the EWT faster, but it will run less thus the EWT catches up between cycles? I know the side affects are poor humidity removal when summer loads are just starting, and more cycles = shorter life span, but just was wondering. No, I am not planning on doing this, but just had the question.