Damn I can't imagine it being 77 in the house at night. Actually one thing I want to do eventually is add an outside intake on my furnace with a damper, and an attic exhaust. When I turn on the AC, if the outside temp is say say, 10 degrees lower than indoors, it would open both dampers and just use outside air. When it equalizes the dampers would close and the AC would kick on. Basically a DIY economizer. Could pretty much run on just economizer mode at night. Unless we're getting a heatwave it's rare that it will be warmer than 70 outside at night here.