Hi, I have learned a great deal on this forum over the past few months. I was wondering if anyone could provide a quick sanity check. I have been working with dandelion energy, a GSHP installer in NY, CT, and NJ. They have designed a system for my new construction home (4600 sq feet conditioned space) that sounds fine. The home is about 45 minutes north of Albany, NY. The Manual J for the home has a winter design load of 66,000 BTU/Hr. The basement, 1st floor, and second floor, have heat loads of 18000, 30000, and 18000 BTU/hr respectively. They have proposed a four-ton ENERTECH HP (I think this is also geocomfort?) that is zoned for the basement and 2nd story. A three-ton unit will service the 1st floor. These units should be able to output a total of 28200+22700=50900 BTU/hr at EWT=30F. Based on these figures, the balance point for both units should be around 5-10 F. I may be overthinking things, but one concern of mine is that the zoned system (basement + 2) will behave oddly during the fall and spring. Although the unit seems appropriately sized when both zones are calling, a single zone (with a winter design load of 18000 BTU/hr) will receive the 1st stage capacity of 33100 BTU/hr (brochure specifications at EWT=50). Does this seem oversized for heating? For cooling in the summer, the situation will be even worse, as the first stage cooling of the four ton unit is 38,000 BTU/hr. According to the manual J, The basement and 2nd story each have cooling loads of about 11,000 BTU/Hr. Is this so grossly oversized for cooling that I should be concerned? There is a water furnace dealer in the area but their quote was much higher and their financing options more limited, so I do not think I can afford 5 ton series 7, which would remove and concerns for over sizing. Thanks for reading.