Does the app work offline?
Yes. All calculators, jobs and PDF reports work without a connection. Buying or restoring Pro needs access to the App Store.
HVAC Calculator · iPhone and iPad
Support
Get help with a calculation, a purchase, a saved job or a report.
Email Pairmind
Tell us what happened.
Include your device, iOS version, the app version shown in Settings, the calculator you used and the exact inputs. You can leave out customer details.
01 · Basics
Frequently asked questions
How do I restore Pro?
Open Settings in the app and tap Restore purchases with the Apple Account that made the purchase. You can also tap Restore on the Pro screen.
Is Pro a subscription?
Pro is sold as a one-time lifetime purchase. If you bought an earlier monthly or yearly plan, manage or cancel it in the iPhone Settings app under your name → Subscriptions.
Which refrigerants are included?
R-410A, R-32, R-454B, R-22, R-134a and R-407C pressure-temperature data for superheat and subcooling.
Are the results a substitute for manufacturer data?
No. The calculators are field references for trained technicians. Always follow the equipment manufacturer's charging charts, codes and safety procedures.
02 · Fixes
Troubleshooting
A result looks wrong. Check the units (°F/°C, psi/kPa) in Settings and the refrigerant selected, then send us the exact inputs.
Pro didn't unlock. Check your connection and tap Restore purchases in Settings.
03 · Data
Privacy
The app has no account. Calculator inputs, jobs, customer fields, notes and PDF contents stay on your device. Pairmind receives limited pseudonymous analytics and purchase records as described in the Privacy Policy.
04 · Contact
Contact details
Email hello@pairmind.dev. We usually reply within two business days.
Pairmind Limited
7/F, MW Tower, 111 Bonham Strand
Sheung Wan, Hong Kong