Excuse the newbie question: Should I finish my weatherization projects (insulating the roof and basement) before doing a Manual J and sizing a geo installation? background: I have a 3000 sq ft house in new hampshire and am keen to install geo hvac (at present, it has an oil-fed forced hot water furnace). Am planning to retrofit ducts and do a closed loop indirect water to air geo. One contractor did a back-of-the-envelope size estimate of 6 tons, and offered a general estimate of 40k for the well, ductwork, heat pump, and desuperheater. He has not had a manual J done yet, but will once I commit to the install. Another contractor offered to do a Manual J up front for $800. I don't want to waste their time or my money, and wonder whether I should wait to do the manual J until the envelope work is complete. As I mentioned, I am also planning to insulate the roof and basement this summer--which is a project because of vaulted ceilings. Thank you.