Fanbutler switches on the fan when the outside temperature is lower than the inside; it determines precisely when to bring in cooler air to cool your home.

It utilizes colder nighttime air to pre-cool your home for hotter daytime temperatures.

Using cooler outside air will reduce the temperature of the mass in your home, acting as thermal storage to absorb the heat during the day. Link to explain vetilation

This cooler mass absorbs heat during the day, extending comfort throughout the day and potentially delaying the need for air conditioning. Learn more

This is a common practice that is done manually. With Fanbutler it could be fully automatic. Explain 1 window opening intake and exhaust