Comparison

HVAC Load Plus vs Thermal Engineering Calc

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

Thermal Engineering Calc

This app provides 44 calculators for thermal engineering parameters, along with thermodynamics tables, formulas, and definitions. It's a comprehensive tool for mechanical engineers and students needing to perform various thermal calculations.

Highlights
  • 44 thermal engineering calculators
  • Thermodynamics tables
  • Formulas and definitions
  • Carnot and Rankine efficiency calculators
  • Heat transfer calculations
  • Temperature conversion
Features
Read full description

Thermal Engineering Calc. has 44 Calculators related to THERMAL ENGINEERING PARAMETERS along with Thermodynamics Tables - Formulas and Definitions too List of Calculators are : 1.Carnot Efficiency (Carnot Cycle) 2.Eckert Number 3.Emissivity Coefficient 4.Energy Efficiency 5.Energy/Work Converter 6.Enthalpy 7.Entropy 8.Fick's Law of Diffusion 9.Fouling Factor 10.Fourier Number 11.Heat Flow 12.Heat Storage 13.Heat Transfer Rate 14.Kinetic Energy 15.Laws of Thermodynamics 16.Lewis Number 17.Liquid Phase Diffusion Coefficient 18.Nusselt Number 19.Peclet Number 20.Potential Energy 21.Prandtl Number 22.Radiation Constant 23.Radiation Converter 24.Radiation Heat Transfer 25.Rankine Efficiency 26.Sherwood Number 27.Specific Heat Capacity Calculator 28.Specific Heat Capacity Converter 29.Stefan-Boltzmann Law 30.Surface Absorbtivities -Tables 31.Temperature Converter 32.Thermal Area Expansion 33.Thermal Conductivity (Common Liquids) -Tables 34.Thermal Conductivity (Heat Exchanger Materials) 35.Thermal Conductivity Calculator 36.Thermal Conductivity Converter 37.Thermal Diffusivity 38.Thermal Expansion Converter 39.Thermal Linear & Volumetric Expansion Relationship 40.Thermal Linear Expansion 41.Thermal Resistivity 42.Thermal Transmittance 43.Thermal Volumetric Expansion 44.Work Useful for Mechanical Engineers and Students.

Screenshots

HVAC Load Plus4 screens
Thermal Engineering Calc4 screens

Verdict

The call

The clearest difference is price: Thermal Engineering Calc at $2.99 against HVAC Load Plus's $24.99. Thermal Engineering Calc also leads on rating (4.7 vs 2.8) and in-app purchases (none vs 1). HVAC Load Plus's advantage is review sentiment (60% vs 50%) and iOS requirement (13.0 vs 16.1). On ratings volume, update cadence, ads and monetization model 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 Thermal Engineering Calc $2.99 up front. HVAC Load Plus sells 1 one-off in-app purchase. Thermal Engineering Calc asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Thermal Engineering Calc holds the better App Store score, 4.7 against 2.8. Both are backed by a comparable volume of ratings — 5 and 6 respectively. Written reviews complicate that: 60% of HVAC Load Plus's written reviews are positive against 50% of Thermal Engineering Calc'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, Thermal Engineering Calc every 15 months. The most recent releases landed on October 15, 2026 and October 6, 2026 respectively.

Scorecard5 real differences · 5 level
HVAC Load Plus versus Thermal Engineering Calc: the parameters behind the verdict, then further details
ParameterHVAC Load PlusThermal Engineering Calc
Price$24.99$2.99 — better
Rating2.8 (5 ratings)4.7 (6 ratings) — better
Positive reviews60.0% of reviews — better50.0% of reviews
Number of ratings56 — better
Update frequencyEvery 9 months — betterEvery 15 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPodiPhone, iPad
Requires iOS13.0 — better16.1
Further details — not scored
Size18 MB3 MB
Age rating4+4+
DeveloperCarmel Software CorporationV PUGAZHENTHI

Customer experience

HVAC Load Plus

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

Thermal Engineering Calc

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

1 purchases

HVAC Load Plus

One-time1
  • HVAC Equipment Locator$9.99
None

Thermal Engineering Calc

No in-app purchases

Questions

Is HVAC Load Plus free?
HVAC Load Plus costs $24.99, and also offers in-app purchases.
Is Thermal Engineering Calc free?
Thermal Engineering Calc costs $2.99, with no in-app purchases.
Which has better reviews, HVAC Load Plus or Thermal Engineering Calc?
Thermal Engineering Calc is rated higher. HVAC Load Plus averages 2.8 out of 5 from 5 ratings, while Thermal Engineering Calc averages 4.7 from 6 ratings.
Do HVAC Load Plus or Thermal Engineering Calc have ads?
Neither HVAC Load Plus nor Thermal Engineering Calc shows ads.
Which is updated more often, HVAC Load Plus or Thermal Engineering Calc?
HVAC Load Plus ships an update every 9 months, and Thermal Engineering Calc every 15 months. Most recently, HVAC Load Plus was updated on October 15, 2026 and Thermal Engineering Calc on October 6, 2026.

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