I would have all systems up and running i.e. frig on gas, hot water heater filled and running, furnace up and unit warm, generator fired up, make sure all works as it should or be aware of what doesn't function so you have an idea of what you will have to spend. Take unit out for a test drive have owner with you to ask questions as they come up. Any used unit is a crap shoot and some times you win some times you don't but due diligence is your job, and the only way is to really to test drive unit and all systems. Good luck Ron
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