HVAC Buddy®
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Make your job easier with our 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 Subcooling forTXV/EXV systems
• Calculates targeted vs. actual Subcooling
• Over 100 refrigerants including newer azeotropic blends
• Airflow / Delta-T / TEET Calculation
• Email System Status Report
• Imperial (IP) or Metric (SI)
• Use Target Superheat and Subcooling tables or enter manually
• Update all values with realtime output
• Line Chart displays historical values based on input changes or elapsed time

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!

Overall Process:

• Enter refrigerant, temps, and pressures
• The math is done for you to display Superheat, Subcooling and Airflow Target, Actual, and Difference
• Email all readings (detail)

Other Features:

• Flexible units - psi, kPa, Fahrenheit, Celsius, etc.
• Calculates Superheat and Subcooling targets
• Airflow - For cooling, compares a targeted difference across the coil vs. actual. Also called Delta-T or Target Evaporator Exit Temperature (TEET).
• 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 from your contact list. Then on each service call it's just a couple taps to send a personalized report.

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

HVAC Buddy® Load Calc - Now Available

HVAC Buddy® Duct Calc - Powerful tool with a simple to use real-time interface to help you choose optimal duct sizes.

HVAC Buddy® Pressure Temperature - Over 90 Refrigerant combinations and their corresponding PT relationship in Metric or Imperial units.

HVAC Buddy® Psychrometric - Quickly calculate thermodynamic properties of moist air at temperatures commonly used in HVAC systems. Enter multiple sets of properties, mix air streams.
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User Rating

2.9 out of 5

10 ratings in United States

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Ratings History


Save your money

omgwhogivesaf on

Other free apps work better. Do not purchase this. Waste of money


mjpplumber on

This app used to work well until last update. Now when you attempt to go into S-Cool, it kicks you out of the app……. Any ideas?

Good app waiting for fixes

2story on

I like this app ALOT, Im sure fixes are on the way. Seems silly for me to have to enter the wet bulb in each screen, Sh,sc and indoor air???

Back to my #1 go to app!!!!!!

Jst4funn on

I have been a fan of this app since 2012, but was disappointed when the diagnostic tab was lost in the facelift. But you listened, and corrected the issue, almost overnight! Great job, and thanks for being so responsive. I highly recommend this, and all this developer's apps. They stand behind their products, and great customer service. Well worth the price.

No longer useful

StevenThatcher72 on

Without the diagnosis tab to give recommendations of what's wrong, I have no use for this app. My digital gauge set does all the things this current version of the app does. Please bring back the diagnostics. The help section is just an advertisement for another app and is not telling me anything about how to use this app. Disappointed

No more Great app!

Soyomero1 on

New update 👎🏼. Complicated. Sencilla eficaz y fácil de usar, solo necesita mas refrigerantes.

HVAC Buddy R-4

Car-rel on

The new version of HVAC Buddy R-4 has a screen capture issue. While the capture shows up in photo's, if you try to import it into "Invoice 2 Go " all you get is a black screen. Screen capture can be texted however. Anyway to roll back to old version? Also all contact options on web don't work.

Miss the old interface

Smokingdodge on

Just tried the new version and miss the old style.

Old one had red to green good/bad indicators it was much more helpfull to techs and customers

Sfcahr on

Also no diagnose advice in new one no instructions for the silly graphs Red green idiot lights to signal a go nogo status are better

It was good

Mp4545 on

The most recent update has a fancier look but is less useful than the old version and seems half finished

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App Info

Kevin Burandt
Recent version
5.0.14 (4 years ago )
Released on
Aug 20, 2009 (14 years ago )
Last updated
4 days ago