[bofh23]

This “Smart Window Fan” is a window-mounted economizer. If it’s cooler and dryer outside, like at night, it opens its louvers and pulls in cool air and exhausts warm air. It also has a HEPA filter. I assume it has humidity sensors too to avoid running when it’s humid outside.

I am wary of a product sold by only one vendor. Economizers tend to be added to large central ducted commercial HVAC systems and this is the only window unit I’m aware of.

EcoBreeze 2.2 - Nature's Cooling Solutions® https://naturescoolingsolutions.com/ecobreeeze-2/