HVAC Buddy®

HVAC Buddy®


(1 stars)


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5,000 - 10,000 downloads

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Make your job easier with our handy refrigerant charging and diagnostic HVAC app - HVAC Buddy®. If you are servicing equipment the best way to begin diagnosis and determine the proper refrigerant charge is to use HVAC Buddy, a set of gauges, and a thermometer.

• Superheat for fixed capillary or Subcool forTXV/EXV systems
• Calculates targeted vs. actual Subcooling
• 73 refrigerants including R-22 (Freon), R-410A (Puron), R-404A, R-134A
• Airflow / Delta-T / TEET Calculation
• Diagnosis tab for leaks, overcharge, contaminants, etc.
• Email System Status Report
• Imperial (IP) or Metric (SI)
• Use Target Superheat and Subcool tables or enter manually
• Fast! Update values realtime with Temp and Press sliders
• User friendly with several pages of step by step instructions

if the early outdoor temperature is 75F and you charge the system to a “beer can cold” suction line your system is likely improperly charged. Later in the afternoon high temperatures will increase head pressure and the resulting overcharge means a lower than desired superheat and wasted energy. Not good!


Use HVAC Buddy to enter refrigerant, temperatures, and pressures. The math is done for you to display Superheat or SubcoolingTarget, Actual, and Difference. Use temperature and pressure sliders to see what happens in realtime when these values change. HVAC Buddy contains generic charts for target Superheat and Subcool as well as pressure-temperature tables for 71 Refrigerants. Temperature data for your pressure is displayed on the refrigerant row and changes can easily be viewed by moving the pressure slider. Add or recover refrigerant to get the Actual value to within the displayed target Superheat or Subcool range.

Diagnosis tab - shows common causes for high and low superheat, subcooling.

Instructions - Several pages of detailed step by step instructions.

Imperial/Metric - View units in Fahrenheit/Celsius or psi/kPa.

Airflow - For cooling, compares a targeted difference across the coil vs. actual. Also called Delta-T or Target Evaporator Exit Temperature (TEET). Sliders change values in realtime.

System Status Report - Use the email tab to create defaults for email addresses, subject, and System Status Report introductory text. Tap the email button and these values are incorporated into a formatted page including all the parameters recorded in HVAC Buddy. Edit the email and / or add contacts. Then on each service call it's just a couple taps to send a personalized report.

Note: To access Diagnostics, Email, and Instructions use your phones menu button.

This app does NOT have a traditional PT Chart display. However, you can view temperatures in the upper left hand corner given any vapor line pressure (Superheat tab) or Liquid leaving pressure (Subcooling tab).

Accolades and Awards:
HVAC Buddy ranked #2 in ContractingBusiness.com readers choice of top 10 contracting apps.

HVAC Buddy was featured by the California Association of HERS Raters and is CalHERS approved!


"Very cool app. I can see California really running with this as we have strict requirements for verification." - John Richau, Executive Director, Calhers

"an excellent programme" - Charlie Richards

About Powertrade
Powertrade is the number one developer of mobile HVAC apps with professional looking, proven apps in the hands of over 20,000 users worldwide.

Powertrade HVAC Buddy® Applications:
HVAC Buddy® Load Calc - Improve accuracy when sizing equipment, demonstrate professionalism on the job, and add substance to your proposals by using our heat loss and heat gain calculation app.

HVAC Buddy® Load Calc (Apple) - Also available on iOS devices - iPhone, iPad

HVAC Buddy® Duct Calc - Powerful, real-time interface to help you choose optimal duct sizes.

HVAC Buddy® Pressure Temperature - PT Chart with 71 Refrigerants in Metric or Imperial units.

Tags: hvac buddy, hvacbuddy, tables r134 a per, hvac, hvac buddy 1.4.3, celcius psi pt chart, free hvac buddy fro, hvac buddy® 1.4, buddy hvac, superheat calculator.

Recently changed in this version

Release 1.9 February 17, 2013:

• Fix "App Not Licensed" error with Google Play

Release 1.8 February 16, 2013:

• Correct potential force close on Asus Transformer Tablets
• Updates for latest Android devices

Release 1.7 December 2, 2012:

• Add Refrigerants R407F
• Updates for latest Android devices
Release 1.6 July 9, 2012:

• Add Refrigerants R438A (MO99), R422B
• Corrections for sat values in blended refrigerants other than R410A

Comments and ratings for HVAC Buddy®
  • (16 stars)

    by Alejandro Rios on 15/05/2014


  • (16 stars)

    by Keith Hess on 03/04/2014

    Very good app.

  • (16 stars)

    by Jeremy Jordan on 29/03/2014

    I taught the process but this is simplicity at its finest.

  • (16 stars)

    by Kevin Chestnut on 27/03/2014

    It's a good app in that it delivers what it promises. I can do SH and SC calculations in my head but it's nice to have an app to input and verify that I'm thinking clearly. Sometimes on a long hot busy day thinking clearly can be a problem! Like the fact that you can use a lot of different refrigerants although I mainly work with R-410a and R22. The diagnostics are good, but again, they mainly

  • (16 stars)

    by Chi Ming Tong on 21/12/2013

    It only give the right figure when using the unit of psi and Fahrenheit for superheat and subcool calculation, the figure is not correct when using other unit in subcool calculation, like using Celsius and Kpa, Celsius and psi or celsius and bar. Can it be fixed

  • (16 stars)

    by jose perez on 19/09/2013

    It's very helpful on the sc sh part...

  • (16 stars)

    by KIP NIELSON on 23/07/2013

    Basic information you can get for free all over the app store they lead you to believe it has more information than it does.

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