Free HVAC Tools & Apps for Technicians — and When to Upgrade
You do not have to pay to get value on day one. R-Pro publishes free tools any technician can use right now — no sign-up, works offline. Here is what is free, and what the full app adds when you are ready.
Refrigerant PT chart calculator
Convert pressure ↔ saturation temperature for 34 refrigerants — the basis for superheat and subcooling. Free at /tools/refrigerant-pt-chart/.
Troubleshooting guides
Component-by-component fault guides: causes, on-site diagnosis and repair steps. Free at /guide/.
No sign-up, offline
The free tools load once and keep working with no connection.
Where R-Pro fits
When the free tools are not enough, the full R-Pro app adds symptom-based fault diagnosis with causes, repair steps and parts, ai diagnosis assistant, equipment nameplate scanner (model, specs, history), business card & purchase-invoice scanner, voice memo with transcription, customer, service-call and maintenance tracking — offline-first (works with no signal on site), in 10 languages. It is $9.99/month with a 7-day free trial, so you can try the whole thing before paying.
Try R-Pro free for 7 days
Field-first HVAC & refrigeration app — diagnosis, scanning, voice memo, customer & accounting tracking. offline-first (works with no signal on site), 10 languages. $9.99/month.
Start your free trial →FAQ
Is there a free HVAC app?
R-Pro offers free web tools — a refrigerant PT chart calculator and troubleshooting guides — with no sign-up. The full field app has a 7-day free trial, then $9.99/month.
Is the refrigerant PT chart free?
Yes. The R-Pro PT chart calculator covers 34 refrigerants, works offline and needs no account.
What does the paid HVAC app add?
Fault diagnosis, AI assistant, nameplate/card/invoice scanning, voice memo, and customer/service/accounting tracking — all offline, in 10 languages.