Crawlspace insulation/vapor barrier/sealing
I read many posts on sealing a crawlspace. I've read that big factor on what to depends on geographic location of the house. My house is in southern New York State. I have humid summers and cold winters. I'm fixing a house for my mother, and I have a crawlspace with a dirt floor on grade, 2 ft. concrete block walls above grade, and two access doors to the outside. I need to address insulation and dampness. I was going to install a vapor barrier over the dirt, insulate the pipes with pipe insulation. I had planned to use a product like such as thermax on the block walls and rim joist, and install unfaced batts in the above floor joist. the HVAC is located in the attic. Lastly, I had planned to have two floor vents installed to allow air flow of conditioned air from the living space above.
Or, should I instead focus on insulation, sealing and vapor barrier in the floor assembly and leave the crawlspace vented, but then what do I do to keep the pipes from freezing. Thanks in advance for anyone who has advice.