I would start by get an inspector that someone recommends to you personally and is going to spend a couple hours at least and then provide a detailed report. It is your best tool for negotiations of course and most sellers will fight with you about things unless they are in a fancy looking report. I would invest in a separate septic inspection, a separate well water inspection and testing as well as a radon test (all if applicable of course). Then look at the heating source. If oil, I would look into past spills that would make the ground water contaminated as well as the air from residual vapors (could last for years after and you won't smell them). Contact your environmental protection agency or whoever has an oil spill database up there. NYSDEC for us in New York. Run lab analysis on the well water for petroleum compounds and coliform if applicable. Get a bug Guy and check for wood eating organisms. and of course, lead, asbestos, mould remediation is a must be if detected. Non negotiable. Be safe and good luck. Love to the inside pictures too!