I'm in the process of getting quotes for a geothermal install and as usual, there are as many ideas as possibilities. A couple questions have come up that I'd like some opinions on from anyone in the SE Pa (Philadelphia area)...

A heat load analysis shows that I need around 10 Tons capacity (1 5-ton and 2 2.5 ton) units.

1. I was told a total of 1500 feet if vertical bore? Does this sound correct? Similarly, 6900 ft if horizontal.....

2. in doing this, is it best to have each unit with separate feeds from the ground loops into the house? For example, three pairs of incoming lines (one for each unit)?

3. is there any value to having extra vertical bores? Does this impact the water pump requirements?

My expectation is that our load calcs area assuming that we want to not-require our backup/emergency oil heat..... is that a reasonable expectation for this area?