HVAC Toolkit vs Thermal Engineering Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC Toolkit
This comprehensive toolkit offers essential HVAC calculations and tools for professionals. It combines multiple specialized applications into a single, convenient package for iPhone and iPad users.
- Equipment tracking and customization
- Refrigerant pressure-temperature charts
- Refrigerant charge calculations
- Duct sizing
- Cooling and heating load calculations
- Psychrometric calculations
- Steam tables
- Pipe sizing for liquid, steam, and gas
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The HVAC Toolkit app for the iPhone and iPad is the essential app for anyone in the HVAC industry. It includes a combination of many of our stand-alone iOS applications. Individually, the apps cost a total of $70. By purchasing the Toolkit, you pay only $24: 1. HVAC Equipment Locator 2. HVAC PT Chart 3. HVAC Refrigerant Charge 4. HVAC Duct Sizer 5. HVAC Quick Load 6. Psychrometrics 7. Steam Tables 8. Pipe Sizer - Liquid 9. Pipe Sizer - Steam 10. Pipe Sizer - Gas High 11. Pipe Sizer - Gas Low This is a universal app that works on both the iPhone and iPad. The "HVAC Equipment Locator" module allows you to track, share, and customize your equipment nameplate and maintenance data. The version here includes the ability to customize your input screens. The "HVAC PT Chart" module allows you to easily view the pressure-temperature properties of 75 refrigerants. Think of this app as a digital version of the paper PT charts that you may have carried around with you in the past. The "HVAC Refrigerant Charge" module allows you to perform superheat and subcool refrigerant charge calculations on-the-fly. This app includes pressure-temperature data for over 75 common refrigerants. The "HVAC Duct Sizer" module allows you to quickly size one HVAC duct run and a range of duct sizes. You can specify the total airflow in CFM (or L/s), the aspect ratio and one of either the velocity of air or the friction loss per 100 feet (30 meters). The "HVAC Quick Load" module allows you to perform quick and simple HVAC cooling and heating load calculation analysis. You can specify the building type, total area, and # of people. The results include the total cooling and heating loads and airflows. The "Psychrometrics" module allows you to easily perform single-state and mixed-air HVAC psychrometric calculations for a wide range of barometric air pressures. The "Steam Tables" module allows you to calculate the properties of saturated or superheated steam by specifying 2 input properties. The "HVAC Pipe Sizer - Liquid" module allows you to size a pipe run with many different types of liquids (or fluids), pipe material and fitting types. The "HVAC Pipe Sizer - Steam" module allows you to size a steam pipe run, and it also includes a bonus steam table calculator. The "HVAC Pipe Sizer - Gas High/Low" module allows you to quickly size a simple low (less than or equal to 1.5 psi) and high (greater than 1.5 psi) pressure gas piping system by inputting a number of piping and gas properties. This application includes all of the great features of the individual HVAC iOS applications such as the use of slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results. It also allows you to specify different types of liquids, gases, pipe material types, fitting quantities, min and max ranges, and step values. All of the above modules display units in English or Metric. Also, all of the above modules allow you to send emails with inputs and results. The "HVAC Toolkit" application was designed by Carmel Software Corporation, a leader in HVAC design software since 1995. In fact, Autodesk (the makers of AutoCAD) acquired our load calculation software and incorporated it into their leading 3D modeling software called Revit. In addition, Carmel has developed customized apps for organizations such as ASHRAE, Mitsubishi Electric, and Pacific Gas and Electric, amongst others. We also offer all of the above modules as individual apps for the iPhone/iPad: 1. HVAC ResLoad-J 2. HVAC Psych HD 3. HVAC Duct Sizer 4. HVAC Pipe Sizers 5. Steam Tables 6. Psychrometric Plus 7. Psychrometric LT 8. HVAC Pipe Sizer Plus 9. HVAC Pipe Sizer Gas Plus 10. HVAC Quick Load 11. HVAC Load Plus 12. HVAC Residential Load Calcs 13. HVAC Toolkit Ultimate 14. HVAC ASHRAE 62.1 15. HVAC ResVent 62.2 16. HVAC ASHRAE DFDB 17. HVAC ASHRAE Psych Chart
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.
- 44 thermal engineering calculators
- Thermodynamics tables
- Formulas and definitions
- Carnot and Rankine efficiency calculators
- Heat transfer calculations
- Temperature conversion
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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.
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Verdict
The clearest difference is price: Thermal Engineering Calc at $2.99 against HVAC Toolkit's $23.99. Thermal Engineering Calc also leads on ratings volume (6 vs 2). HVAC Toolkit's advantage is review sentiment (73% vs 50%) and rating (5.0 vs 4.7). On ads, in-app purchases, 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
HVAC Toolkit costs $23.99 and Thermal Engineering Calc $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
HVAC Toolkit holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews point the same way: 73% of HVAC Toolkit's written reviews are positive against 50% of Thermal Engineering Calc's.
HVAC Toolkit ships an update every 6 months, Thermal Engineering Calc every 15 months. The most recent releases landed on September 14, 2026 and August 22, 2026 respectively.
| Parameter | HVAC Toolkit | Thermal Engineering Calc |
|---|---|---|
| Price | $23.99 | $2.99 — better |
| Rating | 5.0 (2 ratings) — better | 4.7 (6 ratings) |
| Positive reviews | 73.3% of reviews — better | 50.0% of reviews |
| Number of ratings | 2 | 6 — better |
| Update frequency | Every 6 months — better | Every 15 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.1 |
| Further details — not scored | ||
| Size | 50 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Carmel Software Corporation | V PUGAZHENTHI |
Customer experience
HVAC Toolkit
Thermal Engineering Calc
In-app purchases
HVAC Toolkit
No in-app purchases
Thermal Engineering Calc
No in-app purchases
Questions
Is HVAC Toolkit free?
Is Thermal Engineering Calc free?
Which has better reviews, HVAC Toolkit or Thermal Engineering Calc?
Do HVAC Toolkit or Thermal Engineering Calc have ads?
Which is updated more often, HVAC Toolkit or Thermal Engineering Calc?
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