# HVAC Load Plus — HVAC cooling and heating loads

> Mobile HVAC load calculation tool for residential and commercial buildings. (iPhone/iPad app by Carmel Software Corporation.)

- Source: https://appshunter.io/ios/app/hvac-load-plus/id381608273 (this page in markdown: same URL + `.md`)
- Developer: [Carmel Software Corporation](https://appshunter.io/developer/317970398)
- Category: Productivity, Business
- Price: $24.99 with in-app purchases
- Rating: 2.80/5 from 5 App Store ratings · 15 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 18 MB
- Languages: American English
- Released: 2010-08-04
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/hvac-load-plus/id381608273/reviews.md

## What is HVAC Load Plus?

The HVAC Load+ iPhone app allows you to perform detailed heating and cooling block loads for small commercial and residential buildings out in the field by taking advantage of the simplicity and power of the iPhone.

It performs heating and cooling block load calculations based upon industry standard calculation methods. The following is just a small sample of the features included in this app:

1. Includes a 1000+ world-wide city weather database
2. Includes data for 100s of construction types for walls, roofs, floors, doors, windows, skylights, ceilings, and more
3. Allows you to create and store an unlimited number of projects. You can also copy existing projects to new projects for easy reuse of data
4. Allows you to specify an unlimited # of opaque types (ie – doors, walls, roofs, floors, ceilings), window types, and skylight types for each building
5. 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
6. Opaque inputs include opaque type, opaque construction number, dimensions, and opening areas
7. Window inputs include window type, internal and external shading type, overhang dimensions, window area, and more..
8. Skylight inputs include skylight type, dimensions, orientation, and more..
9. Additional input types include # of people, # of bedrooms, ventilation airflow, and more..
10. 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
11. Includes ability to input your company information to display on the emailed report
12. Includes ability to display units in either English (IP) or Metric (SI).
13. Equipment location services

It also includes 2 bonus modules:

1. The "HVAC Equipment Locator" has the same functionality as our stand-alone Locator app. It allows you to input information about all of your HVAC equipment, upload it to a remote web server (at www.carmelsoft.com/EL), and SAFELY share information about it with other technicians within your company. The equipment's GPS coordinates become its globally unique identifier, allowing you to input and retrieve information about it just by standing next to it.

2.  The “HVAC Quick Load” module allows you to quickly perform rule-of-thumb heating and cooling load calcs based upon just inputting the building type, square area, and # of people. Please see the description located under the stand-alone "HVAC Quick Load" app for more details about it.

The benefits of using this app are:

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

This app was designed by Carmel Software Corporation, a 20-year old software design firm specializing in engineering analysis software applications geared toward engineers, architects, technicians, and home owners. In fact, our software powers the analysis capabilities of major Autodesk software tools such as Revit (The makers of AutoCAD).

We will continue to update this app based upon user feedback.  Please email us at info@carmelsoft.com for any comments.

We also offer training and tutorial videos at: www.carmelsoft.com/HVACLoadPlus.

## Key features

- Detailed heating and cooling load calculations
- 1000+ city weather database
- Extensive construction type data
- Unlimited project creation and storage
- Comprehensive load breakdown reports
- Emailable HTML reports with spreadsheet attachments
- Company information display on reports

## Pricing and in-app purchases

Base price: $24.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


## Recent user reviews (10 of 15)

All indexed reviews: https://appshunter.io/ios/app/hvac-load-plus/id381608273/reviews.md

### 1/5 — Do not buy.

*2025-10-02*

App crashes after inputting the very first project name. Do not buy this app.

### 1/5 — Waste of time and money.

*2025-05-20*

Total waste of time and money. Let’s you make a load but crashes whenever you try to share it. Then deletes all the info. Garbage app.

### 2/5 — No updates

*2021-11-24*

Developer does not take care of this app there are no updates it feels like you’re working with a Calculator. I got a new phone and lost all of my loads that I have done in the past there’s no way to export them out. Software is hard to use and not intuitive recommend going to right soft mobile

### 5/5 — Useful app!

*2015-05-18*

I’ve been using this app for years, and it’s very useful. The update is even more so with the Equipment Locator built right in. Even though it’s not a full ACCA Manual J8 app, it’s good enough for me to do fairly accurate loads out in the field. I like the reporting, too.

Great app!

### 3/5 — Disappointed

*2014-05-21*

Bad that it only does 1000 sq ft . Few home are that small. Makes you do room by room then put them all together for total

### 3/5 — Cool App if you are into OK

*2011-10-01*

Several quantifiers are a bit enigmatic for this App.  For those like me who avoid customer service, I will need more time to establish confidence in its recommendations. Regardless, it is a very helpful program.

### 5/5 — Good

*2011-09-14*

Good they have live customer service 
Problem fixed.

### 5/5 — Great for homeowners and pros

*2010-11-20*

I love this app, I used it to calc the loads to replace the two ACs in my house when I couldn't find desktop PC software to do the manual j.  When the contractors came over for bids they wanted to get this app too. It is easy to compare "what if" scenarios by adding insulation to the construction type etc.

### 3/5 — Looks ok so far

*2010-11-05*

I am looking forward to using this in the field in front of clients.  However on the iPad the graphics when exploded to 2x are fuzzy.  I feel like I am going cross eyed.  Looking forward to seeing a true iPad version with a crisp, easier to read display.

### 4/5 — Works good!

*2010-10-17*

I have been in the HVAC industry for over 50 years. I downloaded and installed HVAC Load Plus and plugged in the house a friend just bought.
Came up with exactly the system I ballparked in my head but, now I have something to back up my 'calculations'.

Four stars for now, until I've used it a few more times.

## Frequently asked questions about HVAC Load Plus

### What is HVAC Load Plus used for?

HVAC Load Plus is used to perform detailed heating and cooling block load calculations for small commercial and residential buildings directly from your iPhone in the field. It helps in quickly sizing HVAC equipment and generating reports.

### What kind of data does HVAC Load Plus include?

It includes a database of over 1000 cities worldwide for weather data and data for hundreds of construction types for various building components like walls, roofs, and windows. It also allows input for people, bedrooms, and ventilation airflow.

### Can I share the reports generated by HVAC Load Plus?

Yes, HVAC Load Plus can display a comprehensive HTML report that you can email to yourself or others. It also includes a spreadsheet attachment that can be opened in Excel for further data analysis on a desktop.

### Does HVAC Load Plus support different unit systems?

Yes, HVAC Load Plus includes the ability to display units in either English (IP) or Metric (SI) systems, making it versatile for different regions and user preferences.

### What are the bonus modules included in HVAC Load Plus?

HVAC Load Plus includes two bonus modules: the 'HVAC Equipment Locator' for sharing equipment information remotely and the 'HVAC Quick Load' module for rapid rule-of-thumb load calculations.

### How often is HVAC Load Plus updated?

The app was last updated on March 6, 2023, with the latest version being 4.9. This indicates a history of ongoing development and support.

### What is the price of HVAC Load Plus?

HVAC Load Plus is a paid application, priced at $24.99. This one-time purchase grants access to all its features.

### Is HVAC Load Plus suitable for beginners?

While it offers detailed calculations, the 'HVAC Quick Load' module provides a simpler, rule-of-thumb calculation option. The app is designed for professionals but can be learned with its comprehensive features.

## Version history (last 5 releases)

### 4.96 — 2026-04-24

1. Optimized for iOS 26.
2. Fixed issue where screen scrolled all around when trying to move slider controls.
2. Updated help.

### 4.9 — 2023-03-06

1. Optimized for iOS 16 and iPhone 14
2. Updated help

### 4.8 — 2021-11-19

1. Optimized for iOS 15 and iPhone 13
2. Updated individual modules
3. Updated help

### 4.6 — 2020-08-05

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

### 4.5 — 2020-04-28

1. Fixed the issue that occurs on some devices where the Climatic Data screen does not appear when the user clicks the City icon.

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All apps by Carmel Software Corporation: https://appshunter.io/developer/317970398

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*