But I have my PS3 folding and my laptop folding now with a GPU and a SMP (4 core). PS3 does about 1004 points per day (assuming it doesn't get turned off by electric interrupptions) have to get a backup battery to keep it going soon. My laptop has a mobile gpu in it which is getting around 2000 points per day and depending on what wu my smp gets I seem to be averaging between 3000 and 4000 points per day.
But your right about summer time. Not a hot here in Mississippi as Texas, but electricity is still expensive so don't look to increase much this summer.