This comprehensive Pressure/Temperature calculation tool from National Refrigerants provides several unique features designed to make the HVAC/R technician’s job easier. This app can calculate a simple pressure/temperature relationship or calculate superheat/subcool temperatures. The user can input pressure or temperature(s) on any screen and the other values are automatically calculated and displayed. For refrigerant blends, both saturated vapor and saturated liquid values are displayed. Within the superheat/subcool screen, a graphic display for blends will show the entering, mid-point, and outlet temperature as well as line temperature.

Other features include:
- Automatic altitude correction (if location services are enabled)
- English/Metric units
- Easily choose from “favorites” refrigerants list
- Supplementary information about refrigerants and links to NRI website
- Link to NRI Lubricant Cross Reference app
- Link to NRI Branch Locator tool

What’s New

Version 1.0.4

Fixed some iPad layout issues

Ratings and Reviews

5.0 out of 5
43 Ratings
43 Ratings
the amdrew ,

Great Tool

Great tool with many features most P-T apps don’t have. Helps show glide and calculates superheat / subcooling and many other helpful things.

Wesley Branchik ,

Best app for blend refrigerants

Have used this app a few times servicing new high glide refrigerant systems and it works great. It compensates for changes in glide temperatures which is very helpful for new refrigerants

XGlennBx ,

PT Chart

Simply the best out there. Just download it already thank me later.


National Refrigerants, Inc.
6.6 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© National Refrigerants, Inc.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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