Too bad we are in a cool period (SF Bay). I just finished installing a whole house fan and even though it is cool out and somewhat overcast I can still clearly see that it is working as expected but with a surprise that I've not quite settled on. The surprise: When I crank the fan to High, getting a good breeze through all open windows, my living space actually cools down to below the outside temperature. My current experiment I got 5 degrees cooler indoors as compared to outdoors. My attic space temperature dropped 6 degrees over the course of 45 minutes. My uneducated expectation was that I would see my living space and attic space both converge on outdoor temperature. On Low speed (2,304 cfm) I have to go right up to the intake to tell that it is even running (very quiet). On High (4,195 cfm) I can definitely hear it yet it isn't actually annoyingly loud. I am initially pleased with the results.…