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Smaller, faster app. Improved buttons for large text sizes.
PT chart & superheat/subcooling calculator for R-410A, R-454B, R-32, R-22 & more
A fast, free pressure-temperature chart and superheat / subcooling calculator, built by a working HVAC contractor for techs in the field. - Superheat and subcooling: enter the pressure and line temperature and get the answer instantly - Full PT chart from -50°F to 150°F, with liquid (bubble) and vapor (dew) columns for blends with glide - Quick lookup: pressure to temperature, or temperature to pressure - Handles glide automatically: superheat uses the dew point, subcooling uses the bubble point - Vacuum shown in inches of mercury - Works offline on the roof or in the crawlspace - No ads, no account, no data collected Refrigerants: R-410A, R-454B, R-32, R-22, R-404A, R-134a, and the common R-22 replacements R-407C, R-422B, R-422D, R-427A and R-438A. More coming in future updates. The numbers are calculated from standard refrigerant property data and checked against the manufacturers' published PT charts. Want to see these tools used on real service calls? Tap the YouTube link in the app to watch Dallas Cool Air's troubleshooting videos. Made by Dallas Cool Air Corp., Red Oak, Texas.