The crawl space at today’s inspection was conditioned, appears to be professionally done. Insulboard on the walls, totally encapsulated. The supply duct was taken off the floor register above and laying in the crawl space. You can see the crawl space from inside, looking into the register grill.
It’s the only supply I see to “condition” the crawl space. I’m not there to analyze the efficiency or how much supply it needs, but is it okay to have that opening to the crawl space thru the register above? I don’t think it’s a great idea, because critters could still get in the house, but I’m really wondering if there is concern with allowing air in the living space and air in the conditioned crawl to mix?