# HVAC Pro Calculator: NEC + P-T — Duct · Voltage · Refrigerant > HVAC technician and electrician field calculator for load, duct, voltage drop, and refrigerant P-T. (iPhone/iPad app by PLAYRIOT LLC.) - Source: https://appshunter.io/ios/app/hvac-pro-calculator-nec-plus-p-t/id6768459507 (this page in markdown: same URL + `.md`) - Developer: [PLAYRIOT LLC](https://appshunter.io/developer/1875195414) - Category: Utilities, Productivity - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 17.0 · 9 MB - Languages: American English - Released: 2026-05-13 - Data updated: 2026-08-27 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/hvac-pro-calculator-nec-plus-p-t/id6768459507/reviews.md ## What is HVAC Pro Calculator? 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 analytics, no ads, no upsell spam. Free tier is genuinely useful. Pro is genuinely valuable. • Apple-native. SwiftUI, dark mode, Dynamic Type, iPad split view — built for iPhone and iPad on iOS 17+. PRICING HVAC Pro is $19.99 / year (with a 3-day free trial) or $4.99 / month. One subscription unlocks every Pro calculator, PlateScan, unlimited saved jobs, and PDF export. Cancel anytime in Settings > Apple ID > Subscriptions. Auto-renews until canceled. — Built by PLAYRIOT LLC. Calculations are estimates intended for trade professional use. For code-compliant Manual J load submittals, use ACCA-certified software. Support: https://hvacprocalculator.com/support Privacy: https://hvacprocalculator.com/privacy Terms: https://hvacprocalculator.com/terms Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - BTU & Cooling Load Sizing - Duct Sizing Calculations - NEC Voltage Drop & Wire Sizing - Refrigerant Pressure-Temperature Charts - Superheat & Subcooling Diagnostics - Unit Conversion Tools - Unlimited Saved Jobs (Pro) ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | HVAC Pro Yearly | $19.99 | per year | | HVAC Pro Monthly | $4.99 | per month | ## Frequently asked questions about HVAC Pro Calculator ### What is HVAC Pro Calculator? HVAC Pro Calculator is a utility app designed for HVAC technicians and electricians. It offers tools for BTU load sizing, duct calculations, NEC voltage drop calculations, and refrigerant pressure-temperature charts, with formulas cited from industry standards. ### Does HVAC Pro Calculator have ads? No, HVAC Pro Calculator is ad-free. The developers emphasize that there are no ads, tracking, or upsell spam within the application, ensuring a clean user experience. ### What are the pricing details for HVAC Pro Calculator? The app offers a free tier with essential features. An optional Pro subscription is available for $9.99 per year, which unlocks advanced features like unlimited saved jobs and PDF export. A 3-day free trial is included with the yearly subscription. ### What devices is HVAC Pro Calculator available on? HVAC Pro Calculator is built for iPhone and iPad devices running iOS 17 or later. It supports Apple-native features like dark mode, Dynamic Type, and iPad split view. ### How often is HVAC Pro Calculator updated? The latest version of HVAC Pro Calculator is 1.2.0, which was last updated on June 17, 2026. Updates typically bring new features, improvements, and bug fixes. ### Can I cancel my HVAC Pro subscription? Yes, you can cancel your subscription at any time. Cancellations can be managed through your device's Settings > Apple ID > Subscriptions. The subscription auto-renews until canceled. ### What is the age rating for HVAC Pro Calculator? HVAC Pro Calculator has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions. ### What makes HVAC Pro Calculator stand out from other trade apps? Users appreciate that every formula is cited with its source (ASHRAE, NEC, SMACNA), providing accuracy. The app also features a field-readable, high-contrast design for sunlight readability and one-handed gloved typing. ## Version history (last 5 releases) ### 1.3.6 — 2026-08-27 Fixed: Capacitor Test now shows the microfarad symbol correctly - it was rendering as "MF". The main button now tells you what you get. Once your readings are in, it reads "See Full Breakdown" instead of "Calculate". Your one free run on each Pro calculator works exactly as before: tap through for the full result, sources and all. The live estimate now waits for that tap instead of showing the answer first. ### 1.3.5 — 2026-08-12 Try before you buy: every Pro calculator now gives you one full free run — real result, no trial, no card. Use it on the job and decide after. PlateScan: SCAN now captures a still of the data plate and reads it, so a shaky hand on a rooftop doesn't cost you the read. Added Carrier Comfort-series models, and the PHOTO and SCAN buttons no longer cut off mid-word. Fixed: BTU & Load now shows the Occupants value you entered, and if you kept Duct Sizing free from an earlier version, Pro no longer tries to sell it back to you. ### 1.3.4 — 2026-08-11 Duct Sizing has joined the Pro toolkit, which is now 10 calculators. If you already had the app, Duct Sizing stays free for you — nothing was taken away. Also: clearer Pro calculator count throughout the app, and minor polish. ### 1.3.3 — 2026-08-09 New: a 'More from PLAYRIOT' section in Settings — more field tools from the same team, refreshed daily. Plus minor polish. ### 1.3.2 — 2026-08-05 “Leave a review” now opens the App Store directly — right where the stars are, no dead end. Plus small fixes under the hood. ## More apps by PLAYRIOT LLC - [RegretIt](https://appshunter.io/ios/app/regretit/id6759505734) - [Protein Tracker: MuscleFuel AI](https://appshunter.io/ios/app/protein-tracker-musclefuel-ai/id6759682169) - [NutriLish: AI Calorie Counter](https://appshunter.io/ios/app/nutrilish-ai-calorie-counter/id6759699590) - [Expendy: Voice Expense Tracker](https://appshunter.io/ios/app/expendy-voice-expense-tracker/id6759892984) - [Material Calculator Pro](https://appshunter.io/ios/app/material-calculator-pro/id6760954453) - [DealShield: Car Deal Analyzer](https://appshunter.io/ios/app/dealshield-car-deal-analyzer/id6764470469) All apps by PLAYRIOT LLC: https://appshunter.io/developer/1875195414 ## Related topics [hvac calculator](https://appshunter.io/ios/topics/hvac-calculator) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*