This 11x8.5 durable two-sided sheet presents two troubleshooting trees for two different air conditioning purposes. Side one is titled: Tuning Heat Pumps and Air Conditioners for Energy Efficiency and side 2 is titled Electrical Troubleshooting for Air-Conditioning Systems. Together they are a handy reference for an air-conditioning contractor who is interested in optimizing air-conditioner performance and energy efficiency. Both methodologies are contractor-tested. This Quick Tip reference sheet is designed for the contractor and technician looking for an efficient procedure to troubleshoot problems and save customers money on their electric bills.