HVAC Pro Calculator: NEC + P-T
Duct · Voltage · Refrigerant
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Point your camera at any nameplate — PlateScan reads tonnage, age and refrigerant. Or just say the value out loud. 10 Pro calculators, 3-day free trial, no ads.
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/
Ratings & Reviews
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.
The developer, PLAYRIOT LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- PLAYRIOT LLC
- Size
- 9.4 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- HVAC Pro Yearly $19.99
- HVAC Pro Monthly $4.99
- Copyright
- © 2026 PLAYRIOT LLC