Comparison

HVAC Load Plus vs HVAC Toolkit Lite

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HVAC Load Plus

Perform detailed heating and cooling load calculations for buildings in the field using your iPhone. Access a vast weather database and construction data to generate comprehensive reports that can be emailed or exported to spreadsheets.

Highlights
  • 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
Features
Read full description

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.

About

HVAC Toolkit Lite

This tool assists HVAC engineers with design checks and quick calculations. It offers various tools for ducting friction loss, pipe sizing, ventilation, and heat load estimations, providing instructions and formulas for each calculation.

Highlights
  • Friction loss calculation
  • Pipe sizing
  • Ventilation calculations
  • Heat load estimation
  • Pump head calculation
  • Fan ESP calculation
  • Metric/Imperial units
  • English/Arabic language support
Features
Read full description

The HVAC ToolKit Lite is an easy-to-use app that has been created to assist HVAC engineers in checking their designs and making quick calculations and estimations. The app includes helpful calculation tools for calculating friction losses in ducting, pipe sizing, parking ventilation, staircase pressurization, and estimating heat loads, pump head, fan ESP, among others, where the user is able to enter the required inputs and is given the calculated output. Each tool also includes instructions and abbreviated formulas that have been used to calculate the results. The app can be set to metric or imperial units and/or to the English or Arabic language. Users are expected to have some knowledge and understanding of HVAC engineering in order to use the tools properly. Users are also expected to check that the results are within an acceptable range for their respective projects. If you come across any inconsistencies while using the app or have any recommendations for additional inclusions, please contact us.

Screenshots

HVAC Load Plus4 screens
HVAC Toolkit Lite3 screens

Verdict

The call

The clearest difference is price: HVAC Toolkit Lite at Free against HVAC Load Plus's $24.99. HVAC Toolkit Lite also leads on rating (5.0 vs 2.8) and in-app purchases (none vs 1). HVAC Load Plus's advantage is ratings volume (5 vs 1). On ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

HVAC Toolkit Lite is free to download; HVAC Load Plus costs $24.99 up front. HVAC Load Plus sells 1 one-off in-app purchase. HVAC Toolkit Lite asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

HVAC Toolkit Lite holds the better App Store score, 5.0 against 2.8. That said, the two scores are not equally well evidenced: HVAC Load Plus has 5 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

HVAC Load Plus ships an update every 9 months, HVAC Toolkit Lite every 11 days. The most recent releases landed on October 15, 2026 and September 11, 2026 respectively.

Scorecard6 real differences · 4 level
HVAC Load Plus versus HVAC Toolkit Lite: the parameters behind the verdict, then further details
ParameterHVAC Load PlusHVAC Toolkit Lite
Price$24.99Free — better
Rating2.8 (5 ratings)5.0 (1 ratings) — better
Positive reviews60.0% of reviews—
Number of ratings5 — better1
Update frequencyEvery 9 monthsEvery 11 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidFree — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS13.012.0 — better
Further details — not scored
Size18 MB61 MB
Age rating4+4+
DeveloperCarmel Software CorporationMohamad Jaber

Customer experience

HVAC Load Plus

All ratings5 ratings
Positive40.0%
Neutral0.0%
Negative60.0%
Written reviews15 reviews
Positive60.0%
Neutral20.0%
Negative20.0%

HVAC Toolkit Lite

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

HVAC Load Plus

One-time1
  • HVAC Equipment Locator$9.99
None

HVAC Toolkit Lite

No in-app purchases

Questions

Is HVAC Load Plus free?
HVAC Load Plus costs $24.99, and also offers in-app purchases.
Is HVAC Toolkit Lite free?
HVAC Toolkit Lite is free to download, with no in-app purchases.
Which has better reviews, HVAC Load Plus or HVAC Toolkit Lite?
HVAC Toolkit Lite is rated higher. HVAC Load Plus averages 2.8 out of 5 from 5 ratings, while HVAC Toolkit Lite averages 5.0 from 1 ratings.
Do HVAC Load Plus or HVAC Toolkit Lite have ads?
Neither HVAC Load Plus nor HVAC Toolkit Lite shows ads.
Which is updated more often, HVAC Load Plus or HVAC Toolkit Lite?
HVAC Load Plus ships an update every 9 months, and HVAC Toolkit Lite every 11 days. Most recently, HVAC Load Plus was updated on October 15, 2026 and HVAC Toolkit Lite on September 11, 2026.

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