So as not to hi-jack the thread, I'll start a new one as this is not directly related to refrigerators. Where can I information on heating and cooling with respect to time? I remember from my chemistry and physics course information about heating but I don't recall time being part of the formula. The reason for the interest is the heating and cooling of my home. Thanks -- Linux Home Automation Neil Cherry ncherry@linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist