Comparison

HVAC Load Plus vs AC Calculator Pro

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

AC Calculator Pro

This app assists HVAC professionals and homeowners with air conditioning and heat pump sizing. It provides detailed calculations for cooling/heating capacity, recommends equipment types, and offers unit equivalences and price estimates.

Highlights
  • Commercial Capacity Calculations (BTU/h)
  • Recommended Equipment Types
  • Unit Equivalences (BTU, kW, Kcal, Tons)
  • Updated Price Estimates
  • Energy Consumption Insights
Features
Read full description

It’s a powerful and comprehensive application designed with every detail in mind. Perfect for HVAC professionals, heating and cooling companies, and anyone seeking reliable guidance on air conditioning or heat pump sizing. With AC Calculator Pro, you’ll have access to: Commercial Capacity in BTU/h – Calculate precise cooling or heating capacities for any space. Recommended Equipment Types – Get tailored suggestions for Window Units, Mini Split Systems, Multi Split Systems, Ducted Central Units, Packaged Systems, and Chillers. Unit Equivalences – Instantly convert between BTU, kW, Kcal, and Tons per Hour to fully understand your system’s performance. Updated Price Estimates – View current market prices for each capacity to estimate your equipment’s cost. Energy Consumption Insights – Compare inverter vs. conventional devices to plan for energy savings and operational efficiency.

Screenshots

HVAC Load Plus4 screens
AC Calculator Pro4 screens

Verdict

The call

The clearest difference is review sentiment: HVAC Load Plus at 60% against AC Calculator Pro's 0%. HVAC Load Plus also leads on ratings volume (5 vs 1) and iOS requirement (13.0 vs 18.6). AC Calculator Pro's advantage is price ($9.99 vs $24.99) and rating (5.0 vs 2.8). On ads, monetization model 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

HVAC Load Plus costs $24.99 and AC Calculator Pro $9.99 up front. HVAC Load Plus sells 1 one-off in-app purchase. AC Calculator Pro asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

AC Calculator Pro 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. Written reviews complicate that: 60% of HVAC Load Plus's written reviews are positive against 0% of AC Calculator Pro's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

HVAC Load Plus ships an update every 9 months, AC Calculator Pro every 3 months. Both last shipped on October 27, 2026.

Scorecard7 real differences · 3 level
HVAC Load Plus versus AC Calculator Pro: the parameters behind the verdict, then further details
ParameterHVAC Load PlusAC Calculator Pro
Price$24.99$9.99 — better
Rating2.8 (5 ratings)5.0 (1 ratings) — better
Positive reviews60.0% of reviews — better0.0% of reviews
Number of ratings5 — better1
Update frequencyEvery 9 monthsEvery 3 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPodiPhone, iPad
Requires iOS13.0 — better18.6
Further details — not scored
Size18 MB9 MB
Age rating+44+
DeveloperCarmel Software CorporationMelchisedec Martinez Rodriguez

Customer experience

HVAC Load Plus

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

AC Calculator Pro

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

HVAC Load Plus

One-time1
  • HVAC Equipment Locator$9.99
None

AC Calculator Pro

No in-app purchases

Questions

Is HVAC Load Plus free?
HVAC Load Plus costs $24.99, and also offers in-app purchases.
Is AC Calculator Pro free?
AC Calculator Pro costs $9.99, with no in-app purchases.
Which has better reviews, HVAC Load Plus or AC Calculator Pro?
AC Calculator Pro is rated higher. HVAC Load Plus averages 2.8 out of 5 from 5 ratings, while AC Calculator Pro averages 5.0 from 1 ratings.
Do HVAC Load Plus or AC Calculator Pro have ads?
Neither HVAC Load Plus nor AC Calculator Pro shows ads.
Which is updated more often, HVAC Load Plus or AC Calculator Pro?
HVAC Load Plus ships an update every 9 months, and AC Calculator Pro every 3 months. Most recently, HVAC Load Plus was updated on October 27, 2026 and AC Calculator Pro on October 27, 2026.

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