HVAC Toolkit vs Psychrometric Chart
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
Psychrometric Chart
An interactive tool for HVAC engineers to create and manipulate psychrometric charts. Model various air processes, add and adjust state points with live property updates, and save multiple charts. Export your designs as PDFs or via AirPrint.
- Interactive psychrometric charts
- Model air mixing and heating/cooling
- Live state point adjustment
- SI and IP unit support
- Save and manage multiple charts
- Export charts as PDF
- AirPrint compatibility
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Interactive, graphical psychrometric chart app for HVAC engineers and designers. Allows you to create and manipulate charts and state points with the touch of your finger(s). Processes that can be modeled include: • An individual state point. • Air mixing. • Sensible heating. • Sensible cooling. • Cooling coils. • Other processes by connecting state points. Add new state points by double tapping anywhere on the chart. Hold and drag existing state points to move them on the graph, with properties values updating live to aid you in setting them to the right value. Works in both SI and IP units. Allows you to create and save multiple charts. Properties and energy change for connected points are calculated and displayed live. Share your charts by exporting a PDF file or sending to an AirPrint device. Works on both the iPhone and iPad, but best used on the larger screen of the iPad. ------ We would very much like your feedback! Suggestions, complements, complaints, bug reports etc.: http://www.pheinex.com/contact/ If you like this app, please do not forget to rate it in the App Store! ----- Notes: This application (App) is provided for use by qualified HVAC engineers and designers in the design of air handling systems and is not a substitute for appropriate design services. When in doubt, contact a design
Screenshots
Verdict
The clearest difference is price: HVAC Toolkit at $23.99 against Psychrometric Chart's $59.99. HVAC Toolkit also leads on rating (5.0 vs 4.4) and review sentiment (73% vs 33%). Psychrometric Chart's advantage is ratings volume (34 vs 2) and update cadence (every 3 months vs every 6 months). 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 Psychrometric Chart $59.99 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 4.4. That said, the two scores are not equally well evidenced: Psychrometric Chart has 34 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 73% of HVAC Toolkit's written reviews are positive against 33% of Psychrometric Chart's.
HVAC Toolkit ships an update every 6 months, Psychrometric Chart every 3 months. The most recent releases landed on September 14, 2026 and September 20, 2026 respectively.
| Parameter | HVAC Toolkit | Psychrometric Chart |
|---|---|---|
| Price | $23.99 — better | $59.99 |
| Rating | 5.0 (2 ratings) — better | 4.4 (34 ratings) |
| Positive reviews | 73.3% of reviews — better | 33.3% of reviews |
| Number of ratings | 2 | 34 — better |
| Update frequency | Every 6 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 50 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Carmel Software Corporation | Pheinex, LLC |
Customer experience
HVAC Toolkit
Psychrometric Chart
In-app purchases
HVAC Toolkit
No in-app purchases
Psychrometric Chart
No in-app purchases
Questions
Is HVAC Toolkit free?
Is Psychrometric Chart free?
Which has better reviews, HVAC Toolkit or Psychrometric Chart?
Do HVAC Toolkit or Psychrometric Chart have ads?
Which is updated more often, HVAC Toolkit or Psychrometric Chart?
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