> One problem with ERV/HRV systems right now is that they are very expensive niche products. Most building codes in US/CA mandate them since about 2015, so I'm

> One problem with ERV/HRV systems right now is that they are very expensive niche products. Most building codes in US/CA mandate them since about 2015, so I'm not sure how niche they are (at least in new construction). Depending on the (air) volumes involved, ERVs can be had for under CA$ 2000: * https://gasexperts.ca/product-category/air-exchangers/lifebreath/ https://gasexperts.ca/product-category/air-exchangers/lifebr... * https://bphsales.ca/collections/high-quality-erv-air-exchangers https://bphsales.ca/collections/high-quality-erv-air-exchang... HRVs for less, but it's probably worth the extra few hundred for better humidity management.