mountainsoft
Thinks s/he gets paid by the post
We run our house fan 24/7 to keep good circulation.
Here in Washington state building codes require fresh air ventilation systems. For folks with central air that gets baked into the HVAC system. We have individual room heaters, so we had to get windows with special vents at the top. Then we have a ceiling fan in the laundry room that exhausts stale air so fresh air can come in through the window vents.
We only run ours about 12 hours a day (6 on, 6 off, 6 on, 6 off), but it makes a noticeable difference in our indoor air quality. The house always smells fresh, no stale air like our previous homes.
Of course, we essentially have an open hole at every window, so the heaters have to overcome the cold air that comes in through the vents. Even so, our electric bill is half of what it was for our previous home.
Thankfully, unless it's an extremely cold day you can't feel the cool air coming in unless you stand right below the window vent. They have shutters we can close when needed, but we've never done that in 15+ years of living here (except to keep out smoke from forest fires a couple years ago).
I am surprised how many people have AC. I guess I'm fortunate to live in a part of the country that never really gets that hot. We've never had AC in any of our homes. A really hot day is a treat for us.