Last updated: September 2026
Not a Substitute for Professional Engineering
Every calculator on Learn HVAC Pro — AC Tonnage Calculator, HVAC Unit Converter, Electricity Cost Calculator, Motor, Belt, Pulley & Bearing Calculator, and Superheat & Subcooling Calculator — gives an estimate based on standard industry formulas and rule-of-thumb factors. These tools are built for quick field reference and learning, not as a replacement for:
- An ACCA Manual J load calculation for final AC sizing decisions
- Manufacturer datasheets and nameplate data for the exact equipment you are working on
- A licensed HVAC engineer or technician’s on-site inspection and judgment
- Your local building code and safety regulations
Refrigerant Safety
Working with refrigerants, gauges, and pressurized HVAC equipment carries real safety risks. Only qualified, appropriately certified technicians should handle refrigerant charging, recovery, or system repairs. This site’s Superheat & Subcooling Calculator is a diagnostic reference only — it does not replace proper safety training or local refrigerant-handling certification requirements (such as EPA 608 in the US, or the equivalent certification in your country).
No Liability
Irfan Khan and Learn HVAC Pro are not liable for any equipment damage, injury, incorrect purchase, or financial loss resulting from the use of these calculators. Always verify results against manufacturer documentation and use your own professional judgment before making a purchasing or repair decision.
Sources
Formulas and reference data on this site are checked against publicly available engineering standards, including ASHRAE, ISO, NIST, and the U.S. Department of Energy. The specific source is linked on each calculator page.