HVAC Pro Calculator: NEC + P-T
iOS app by PLAYRIOT LLC. Utilities · PLAYRIOT LLC
- Store rating
- 5 / 5
- Store rating count
- 1
- Download price
- Free to download
- In-app purchases
- Unknown
- Version
- 1.3.6
- Listing last refreshed
- 2026-09-08
View the original store listing
Store description excerpt
HVAC Pro Calculator — BTU load sizing, duct calc, NEC voltage drop, refrigerant P-T charts, superheat & subcooling, plus camera nameplate scanning. Field tools for HVAC techs and electricians. Every formula cited (ASHRAE, NEC, SMACNA). No ads, no tracking. WHAT YOU GET — FREE • BTU & Cooling Load — Heat and cool sizing using ASHRAE-derived rules of thumb. Square footage, ceiling height, climate zone, occupancy, and sun exposure. • Unit Converter — BTU/hr ↔ kW ↔ tons, CFM ↔ L/s ↔ m³/h, °F ↔ °C, PSI ↔ kPa ↔ bar. Everything an HVAC tech converts in a day. • Save up to 2 jobs — Name and store calculations locally. No account, no cloud. UPGRADE TO PRO — 10 field calculators + camera nameplate scanning • PlateScan — Point your camera at any condenser or furnace nameplate. On-device OCR reads the model and serial and decodes tonnage, manufacture date, and refrigerant type, then drops them straight into your calc. Works offline. • Duct Sizing — Manual D simplified via the ASHRAE friction-rate equation. Round and rectangular duct, equivalent-diameter solver, velocity check with noise warnings. • Voltage Drop & Wire Size — NEC voltage-drop formula sized to NEC Table 310.16 ampacity. Single- or three-phase, copper or aluminum. Recommends the smallest AWG that meets both ampacity and your drop limit. • Refrigerant P-T Charts — Pressure ↔ temperature for R-410A, R-32, R-454B, and R-22. Saturation tables baked from manufacturer data, interpolated for any temp or pressure in range. • Superheat & Subcooling — Charging diagnostics off the P-T tables for fixed-orifice and TXV systems. Status badge flags on-target, undercharged, or overcharged at a glance. • Refrigerant Charge — Adjusts the nameplate charge for non-standard line-set length (per Copeland AE 17-1335) and returns the exact amount to add or recover. • System Capacity (ΔT) — Actual sensible capacity an installed system is delivering, from measured airflow and supply/return temperature split. • Psychrometric — Give any two of dry bulb, wet bulb, RH, or dew point; returns the full state — humidity ratio, enthalpy, specific volume, and the remaining temperatures (ASHRAE Fundamentals Ch. 1). • Fan Laws — Scales CFM, static pressure, and brake horsepower from a known operating point to a new RPM. • Sheet Metal Offset — Diagonal cuts and angles for duct transitions, per SMACNA HVAC Duct Construction Standards. • Capacitor Test — Actual μF of a run capacitor from in-circuit amps and volts, compared to nameplate with an ADD / OK / REPLACE verdict (±6%). • Unlimited Saved Jobs — Remove the 2-job cap; save every calculation by job name. • PDF Export — One-tap PDF for customer estimates and code submittals. WHY PROS PICK HVAC PRO • Cited sources, not "approximate." Every formula references its standard (ASHRAE, NEC, SMACNA, manufacturer P-T tables). Status badges flag when readings are out of range. • Field-readable design. High-contrast layout that works in direct sunlight and one-handed gloved typing. • No
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