Need help, found a bug, or have a calculator you'd like added? Get in touch.
Does HVAC Tech work offline?
Yes — every calculator runs fully on-device. No signal needed.
Which refrigerants are supported?
R-410A, R-22, R-32, R-454B, R-134a, R-404A, and R-407C, with bubble/dew points for glide blends.
What does HVAC Tech Pro unlock?
Unlimited saved jobs and PDF / share export. It's a one-time purchase — no subscription. Restore Purchases is in Settings.
I think a number is off.
Email me the exact inputs and the value you expected and I'll verify it against the published charts. Accuracy is the whole point.
HVAC Tech is an estimation aid. Always verify results against manufacturer charging charts, target values, and proper diagnostic procedures.