This is the data taken this afternoon, right after blocking up the ridge vent with shopping bags.
Starting at 13:30, I took many IR scanner readings on the attic exhaust vent (as in pic above),
and they were all about one degree F lower than the peak temperature.
For the first time, we could actually feel some real
usable heat coming out of the vent.
The warm air output stayed steady right up to shut down at 66F.
After the fans turned off, the attic plot line stayed on the same track.
Almost like the fans hadn't been dropping the attic air temp at all.
For about 4 hours, the blowers were moving about 200cfm of warm air into the basement.
Approximately 48,000 cubic feet of warm air!
As you can see from the plot lines, it wasn't too warm today, but the sky was mostly clear.
I just looked at the weather. Next few days are going to be awful..