Air Conditioning can be 44% of residential peak electrical load in California. It makes sense to understand how to get true performance. Rob "Doc" Falke is outstanding and leads us in most high performance http://contractingbusiness.com/archive/practical-standards-measure-... . Rob “Doc” Falke serves the industry as president of National Comfort Institute a training company specializing in measuring, rating, improving and verifying HVAC system performance. If you're an HVAC contractor or technician interested in a no cost copy of a quick reference sheet containing many of the HVAC industry formulas, contact Docrobf@nationalcomfortinstitute.com or call him at 800/633-7058. Go to NCI’s website atwww.nationalcomfortinstitute.com for free information, technical articles and downloads.