Hannabery (Quakertown/Allentown): just re-entering the geothermal realm. They have excellent service staff. I'm following up with them as primary at this point as they have installed two houses for us and we've been their customer for 20 years, but they currently don't have dedicated well drilling companies/loop providers (we had to find a good one ourselves, and if we use Hannabery, we need to manage the interactions between the loop and the internal gepthermal stuff). Note: the well driller we are planning to use is Mayer's Well Drilling (Pottstown, I believe). They did our domestic well, and do a lot of commercial geothermal loops.
Also have a quote coming from Jeff Smith (I believe Warrington/Doylestown). He is associated with a driller, and seems to have much more direct geothermal experience. We haven't used him before, but he was recommended by ClimateMaster. When he came out for the site review, he answered all questions very thoroughly and seemed knowledgable.
Final decision will wait on responses (design plans) from both. We hope to get installed by August / September at latest.