On Thu, 30 Jan 2020 10:25:22 -0500, Ralph Mowery
wrote:

In article ,
says...

This is a townhouse, and it came with and still has a ridge vent that's
almost as long as the house is wide, and a full length soffitt vents
both front and back.

People in this group have told me years ago that I shouldn't have needed
a fan with all this ventilation, and all I can say is when I bought the
house in May, without leaving the AC on, I'd come home after work at
around 6 and the 2nd floor was too hot to enter. It was still too hot
at 10 and at 11. I'd eat dinner and sleep in the basement, and go up
stairs in the morning. This went on daily for weeks.

After I put in the fan, it was 10 or 15 degrees cooler upstairs, still
without the AC, and I almost never needed AC at all. So you'll never
convince me the fan isn't a great thing for my hosue.



Something does not seem right. If you have a ridge vent, the fans will
be sucking much of the air from the ridge vent and not the soffitt vents
and probably would not do much cooling unless the ridge vent was closed
off.
The only way it would do much good is if EITHER the soffit vents or
the ridge vent were severely restricted - otherwise convection would
be MUCH more effective than a piddly fan.