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PT Chart Lookup
Pick a refrigerant and temperature, get instant bubble + dew point pressures from CoolProp / NIST-traceable data.
Open tool →Superheat / Subcool Calc
Measure superheat and subcool from suction / liquid pressure and line temperature with in-range verdicts.
Open tool →HVAC/R Troubleshooting
Walk through symptom-driven decision trees for HVAC and refrigeration system faults.
Open tool →Refrigerant Retrofit Wizard
Pick a from / to refrigerant pair and get oil change, TXV, and drop-in guidance.
Open tool →EPA 608 Practice Test
397 expert-verified questions across Core, Type I, II, III. Take a timed quiz and review misses.
Open tool →Chiller Fault Codes
287 codes for centrifugal and screw liquid chillers. Trane Tracer/UC800, Carrier PIC, York OptiView, Daikin MicroTech, Climacool, Multistack.
Open tool →HVAC & VRF Fault Codes
841 codes for split DX, heat pumps, rooftops, and VRF. Carrier, Trane, Lennox, Goodman, Rheem, York, Mitsubishi, Daikin, LG, Fujitsu, and more.
Open tool →Boiler Fault Codes
667 codes for fire-tube, water-tube, condensing, and combi boilers. Lochinvar, Weil-McLain, Cleaver-Brooks, AERCO, Viessmann, Honeywell, Fireye, Siemens.
Open tool →Refrigeration Fault Codes
603 codes for racks, walk-ins, cases, and ice machines. CPC/Emerson E2, Carel, Danfoss, Hussmann, Hill Phoenix, Manitowoc, Hoshizaki, Scotsman.
Open tool →PPE & Safety Quick-Card
Required PPE, exposure limits, and first-aid notes per refrigerant.
Open tool →Refrigerant Price Tracker
Current bulk pricing per refrigerant with a built-in lbs-to-cost estimator.
Open tool →Knowledge Base Search
Search EPA regulations, refrigerants, recovery requirements, leak rates, and key dates.
Open tool →Cited against real standards
Calculations and verdicts reference published references - EPA 40 CFR Part 82, ASHRAE 34, ISO 8573-1, NIST refrigerant thermodynamic data, and manufacturer service literature. Field data is updated against current EPA rules.