Well I think the biggest factor is humidity.. On nights that it's humid it not as effective and I usually left the air on.. But on the other end of it we had a good string of weather high around 85 (low humidity) lows in the mid 60's and I kept the windows open 24/7 with the fan on. Even when it was 85 the house was pretty nice to be in with just the gental breeze. Now it wasn't the same as coming into a house with the ac on but it was comfortable to me. And I think one of the big reasons it worked on the hotter days was because of the constant flow of air in the attic keeping the actual houses temp low if that makes sense (less radiant heat from attic)
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