Comparison

HVAC Load Plus vs Walabot DIY

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

Walabot DIY

Visualize the inside of your walls with this device and app combination. It acts like an X-ray, locating studs, pipes, and wires up to 4 inches deep. Ideal for confident drilling and renovation projects.

Highlights
  • See through walls
  • Locate studs
  • Detect pipes
  • Find wires
  • Works on drywall
  • Detects up to 4 inches deep
Features
Read full description

Walabot DIY lets you see through your walls! Connect your Walabot DIY device (available at www.walabot.com/diy) to your phone for instant “X-Ray” vision. • Locates studs, pipes, wires, and movement • Works on drywall • Detects up to 4 inches / 10 centimeters deep Want to hang a TV? See where the studs, the wires, and the pipes are and drill with confidence! Perfect for DIY-ers, plumbers, contractors, carpenters, renovators, installers, and more. Winner of “best tool” by: ESPN, This Old House, Popular Mechanics, CES and over a dozen more publications! Million walls scanned with the Walabot DIY! Learn more/order now at walabot.com ** Compatible from iPhone7 and above **

Screenshots

HVAC Load Plus4 screens
Walabot DIY4 screens

Verdict

The call

The clearest difference is price: Walabot DIY at Free against HVAC Load Plus's $24.99. Walabot DIY also leads on rating (4.2 vs 2.8) and in-app purchases (none vs 1). HVAC Load Plus's advantage is iOS requirement (13.0 vs 15.6). On ads and device support 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

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

ReceptionRating · Positive reviews · Number of ratings

Walabot DIY holds the better App Store score, 4.2 against 2.8. That said, the two scores are not equally well evidenced: Walabot DIY has 320 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 60% of HVAC Load Plus's written reviews are positive against 78% of Walabot DIY's.

UpkeepUpdate frequency

HVAC Load Plus ships an update every 9 months, Walabot DIY every 3 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard8 real differences · 2 level
HVAC Load Plus versus Walabot DIY: the parameters behind the verdict, then further details
ParameterHVAC Load PlusWalabot DIY
Price$24.99Free — better
Rating2.8 (5 ratings)4.2 (320 ratings) — better
Positive reviews60.0% of reviews78.5% of reviews — better
Number of ratings5320 — better
Update frequencyEvery 9 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidFree — better
DevicesiPhone, iPodiPhone, iPod
Requires iOS13.0 — better15.6
Further details — not scored
Size18 MB77 MB
Age rating+417+
DeveloperCarmel Software CorporationVayyar Imaging LTD

Customer experience

HVAC Load Plus

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

Walabot DIY

All ratings320 ratings
Positive77.8%
Neutral3.1%
Negative19.1%
Written reviews130 reviews
Positive78.5%
Neutral1.5%
Negative20.0%

Bugs and requests

HVAC Load Plus

Not enough reviews yet to summarise bugs or requests.

Walabot DIY

Reported bugs

3 issues
  • App crashes or disconnects frequently
  • Inaccurate readings or missed objects
  • Compatibility issues with newer phones

Requested features

4 requests
  • Integrated display instead of phone app
  • Improved calibration process
  • Compatibility with more wall types
  • Automatic stud detection

In-app purchases

1 purchases

HVAC Load Plus

One-time1
  • HVAC Equipment Locator$9.99
None

Walabot DIY

No in-app purchases

Questions

Is HVAC Load Plus free?
HVAC Load Plus costs $24.99, and also offers in-app purchases.
Is Walabot DIY free?
Walabot DIY is free to download, with no in-app purchases.
Which has better reviews, HVAC Load Plus or Walabot DIY?
Walabot DIY is rated higher. HVAC Load Plus averages 2.8 out of 5 from 5 ratings, while Walabot DIY averages 4.2 from 320 ratings.
Do HVAC Load Plus or Walabot DIY have ads?
Neither HVAC Load Plus nor Walabot DIY shows ads.
Which is updated more often, HVAC Load Plus or Walabot DIY?
HVAC Load Plus ships an update every 9 months, and Walabot DIY every 3 weeks. Most recently, HVAC Load Plus was updated on November 1, 2026 and Walabot DIY on November 3, 2026.

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