HRV / ERV for a conditioned crawlspace
I’m in climate zone 5-6. 3′ conditioned crawlspace, with 12mil. plastic sealed floor & closed cell spray foam insulation installed on crawlspace walls & rim joists. Forced air gas furnace- ducts into crawlspace with one small flapper vent allowing some air into crawlspace when furnace/ ac is running. I currently run a dehumidifier about 12-24 hours a week in summer months to maintain a humidity level consistent with main floor. I’m about to seal the main level with new windows and 3″ of polyso around exterior, and thus also want to install an HRV/ERV.
My question is- how should I handle the crawlspace regarding HRV?…..should I include an intake and or exhaust into the CS? Currently it is decent down there, but due to exposed fibre cement fireproofing over spray foam and exposed floor joists etc….certainly not as nice an atmosphere as rest of house.