I am very fortunate to live in a wonderful climate. Four seasons, high altitude, low humidity. Summers are mostly low 90s F peak each day, but nights are in the 60s F and sometimes high 50s. Today's mean temperature is 77F. Not bad for the house overall as a target, but I figure I can use ventilation at night to cut down on in-house temperature swings, *and* lower the mean temperature. My efforts thus far have resulted in a mean temp of 74F with a range from 71 - 79 through 24 hours. I'd like to knock off another couple degrees if possible ... ... Approach for now: 20 watt fan operated from about 9pm - 7am in our upper stairs bedroom. 80 watts of fans powered up between 4 - 5 am (when I get up): one outside the house pushing cool air in, one fan on the other side of the house pushing warmer house out out. Fans turned off at 07:30 am Windows and doors closed during the day on the wind side, left open on opposing side to keep in-house humidity down and to provide a small air exchange. All windows are shaded during the day, and unshaded at night. I open the screen opposite the fan pushing cool air into the home in the morning to aid airflow for those hours, but otherwise use screens to keep unwanted guests out of the house. Energy use is about 0.5 kwh/day. I spend perhaps 5 minutes a day total checking wind patterns and making the rounds to open/close stuff. Any ideas for mods/improvements ?