Get thee a swamp cooler posthaste for your next brew. Dead easy to make, all you need is a rubbermaid tub big enough for your fermenter. Fill it with water and put an old t-shirt over the fermenter, making sure the bottom of the shirt is in the water. Train a fan on it, the t-shirt will wick up the water and the fan will make it evaporate, causing cooling. I too live in the Great PNW, and the temperature fluctuations in the last few weeks have been stupid (live about 30 miles south of Seattle). Two of my last three beers have gotten up over 78 but they turned out pretty good, at least in my opinion.