F&L HVAC Quick Reference Cards – Refrigerant Charging & Troubleshooting Guide for Air Conditioners and Heat Pumps – Double-Sided, Waterproof

Stay efficient, accurate, and confident on every job with the F&L HVAC Quick Reference Cards — your ultimate field companion for refrigerant charging, pressure diagnostics, and troubleshooting. Designed by HVAC professionals for HVAC professionals, this 4-piece laminated card set delivers instant access to critical data for air conditioners, heat pumps, and refrigeration systems — helping you save time, reduce guesswork, and improve service quality. Each card is double-sided, waterproof, and built to withstand harsh job site conditions. Whether you’re performing superheat/subcool calculations, checking system pressures, or identifying common issues, these quick-reference charts and guides give you the information you need — fast. Compact and easy to carry, the cards come bound by a durable metal ring so you can keep them clipped to your tool bag or belt. The clear, color-coded design makes it easy to find the right data in seconds, even in low-light conditions. F&L Industries is trusted by HVAC technicians nationwide for delivering durable, professional-grade tools that improve accuracy, efficiency, and productivity in the field.