Any cold weather haunters here? I built a real nice chiller last year, and use 3" black pvc to route it around the yard. Outstanding low level fog during the day, and on warmer evenings. However, as soon as the temperature starts to drop at night, the effect tapers off. I have been using plain ice, and am considering dry ice to lower the fog temp even lower. However, I have to drive 45 miles to buy dry ice in quantity, and the cost would be prohibitive unless I could expect better results. Any suggestions?