iPhone Screenshots


This app may just change the way you do business.

This is one of the longest running HVAC Manual J8 cooling and heating load calculation apps on the market today. See why tens of thousands of engineers, technicians, and architects have licensed our software for their HVAC engineering needs.

(For full online help, click here: http://bit.ly/1GlRulY.

For training webinar, click here: http://bit.ly/1IHn7nA)

This app now includes the HVAC Equipment Locator. Click here for details: http://bit.ly/1yTq539.

This app allows you to perform detailed block and room-by-room heating and cooling loads for residential buildings out in the field, by taking advantage of the simplicity and power of the iPhone.

This app was designed by Carmel Software Corporation, a 25-year old software design firm specializing in engineering analysis software applications. We are not just 1 person designing mobile apps out of a bedroom. We are a team of software developers and engineers with over 50 years combined software and engineering design experience. In fact, our software powers the analysis capabilities of major Autodesk (The makers of AutoCAD) software tools such as Autodesk Revit.

The following is just a small sample of the features included in this app:

1. Calculations based upon abridged ACCA Manual J8 calculations (This is not an ACCA-approved app. For our ACCA-approved iPad app, search for the HVAC ResLoad-J app on the app store)

2. Includes a 1000+ world-wide city weather database

3. Includes data for 100s of construction types for walls, roofs, floors, doors, windows, skylights, ceilings, and more

4. Allows you to create and store an unlimited number of projects

5. Allows you to create an unlimited number of rooms and view individual loads and airflows for those rooms

6. Allows you to specify an unlimited # of opaque types (ie – doors, walls, roofs, floors, ceilings), window types, and skylight types for each building

7. Allows you to instantly view total heating and cooling load results as you update input data

8. Allows you to view comprehensive cooling and heating load breakdown reports including breakdown by opaque load, window load, skylight load, infiltration load, ventilation load and internal load contributions

9. Opaque inputs include opaque type, opaque construction number, dimensions, and opening areas

10. Window inputs include window type, internal and external shading type, overhang dimensions, window area, and more..

11. Additional input types include # of people, # of bedrooms, ventilation airflow, and more..

12. Includes ability to display a wide variety of on-screen reports including checksum reports (ie – BTUh/SqFt, SqFt/Ton, etc.), complete heating and cooling load breakdown reports, and even graphically-pleasing pie charts showing cooling and heating load breakdowns

13. Includes the ability to display a comprehensive HTML report that you can email to yourself or others, and it also includes a spreadsheet attachment that you can open in Excel to further massage data on your desktop

14. Includes English (IP) or Metric (SI) units

15. This is the same technology that powers the Trane MAP iPad app that they offer to their elite dealer network

The benefits of using this app are numerous including:

1. Great for use out in the field. Quickly size heating and cooling equipment, show the client, then email the results back to your office for further analysis.

2. Show off your advanced on-screen reports to clients convincing them you are using cutting-edge technology

3. Save time by inputting information in the field and then returning to your office to perform more in-depth analysis

What’s New

Version 5.0

1. Updated the app launch screen per new Apple iOS guidelines.
2. Updated Google Analytics and Crashlytics

Ratings and Reviews

Cooltall1 ,

Worst ever

It was recommended by Trane to go along with the iPad program. After using it and comparing it to other programs I am so disappointed and it's now a joke around the office. Our building only needs -1.2 tons??? So I guess we need to turn on the heat on next time we want to cool off. I think Carmel should try another load calc so they can use terms we all know instead of making up new names for loads. Bottom line DON'T WASTE YOUR MONEY or TIME.

AirConReseller1001 ,

Good app and great support

I downloaded this app and, yes, it was a little hard to use at first. Isn't all software? I called Carmel, and they got back to me ASAP and trained our guys for 1/2 hour for FREE. After the training, we knew how to use it much better, and now 3 of my guys use it constantly in the field. It's a great tool and I love the email capabilities so I can review their work later on.

Yes, it's not perfect, like I wish the reports were simpler and more appropriate for customers, but they are working on that. As far as I know, this is the only load calc app out there, and it's a great first step in this whole mobile app world. Great app and look forward to more......

HVAC Reseller ,

Great HVAC load calc app

I've been using this app for a couple weeks now at the recommendation of Trane. It's been very useful and accurate. I've compared it to my desktop Manual J software, and it is the same heating and cooling loads.

I especially like the fact that when I first downloaded it, I called Carmel and asked if they could help me out. In fact, they offered to train me and a couple of my guys on how to use the app for about 1/2 hour. It really made a difference in using it after the training session. I would highly suggest being trained.

The negative comments that have been posted may be due to the fact that they do not know how to use the software properly. I would suggest the training.

Great app!


Carmel Software Corporation
18.4 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
In-App Purchases
  1. HVAC Equipment Locator $9.99


  • Family Sharing

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

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