HVAC Pipe Sizer Plus vs AC Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC Pipe Sizer Plus
This utility app combines three specialized pipe sizing tools for HVAC systems: liquid, steam, and gas. It offers flexible input options, unit conversions, and an equipment locator for comprehensive HVAC design.
- Liquid pipe sizing
- Steam pipe sizing with steam table calculator
- Gas pipe sizing (low and high pressure)
- HVAC Equipment Locator
- Slider controls for input adjustments
- English and Metric unit display
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The HVAC Pipe Sizer Plus application is a combination of three (3) of our individual pipe sizing applications including: 1. HVAC Pipe Sizer - Liquid 2. HVAC Pipe Sizer - Steam 3. HVAC Pipe Sizer - Gas Plus This app is a universal app that works on both the iPhone and iPad and adjusts its screen size accordingly. The "HVAC Pipe Sizer - Gas" 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. 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 - Liquid" module allows you to size a pipe run with many different types of liquids (or fluids), pipe material and fitting types. This application includes all of the great features of the individual pipe sizer apps 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. Also, you can display a wide variety of English and Metric units. The "HVAC Pipe Sizer Plus" 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, we developed a number of customized apps for ASHRAE, DNV GL, and other organizations. We also offer the following additional apps for the iPhone and iPad: 1. HVAC Residential Load Calcs for iPhone and iPad 2. HVAC Quick Load Plus 3. HVAC Quick Load 4. HVAC Toolkit 5. HVAC Pipe Sizer – Gas Low Pressure 6. HVAC Pipe Sizer - Gas High Pressure 7. HVAC Pipe Sizer – Liquid 8. HVAC Pipe Sizer – Steam 9. Steam Tables 10. Psychrometric Plus 11. Psychrometric LT 12. HVAC Pipe Sizer Plus 13. HVAC Pipe Sizer Gas Plus 14. HVAC Toolkit Ultimate 15. HVAC Equipment Locator 16. HVAC ResLoad-J 17. HVAC Psych HD
AC Calculator
This utility app simplifies HVAC sizing by calculating BTU/h capacity and recommending equipment. It offers unit conversions, price estimates, and energy consumption comparisons. Advanced features can be unlocked via in-app purchases.
- Calculate BTU/h capacity
- Recommend equipment types
- Convert BTU, kW, Kcal, Tons
- Check price estimates
- Compare inverter vs. conventional
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AC Calculator makes HVAC sizing simple. Quickly calculate BTU/h capacity, get recommended equipment types, convert between BTU, kW, Kcal and Tons, check up-to-date price estimates, and compare inverter vs. conventional energy consumption. Unlock professional-grade features anytime with in-app purchases.
Screenshots
Verdict
The clearest difference is price: AC Calculator at Free against HVAC Pipe Sizer Plus's $13.99. AC Calculator also leads on rating (4.8 vs 3.0) and update cadence (every 4 months vs every 15 months). HVAC Pipe Sizer Plus's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement 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
AC Calculator is free to download; HVAC Pipe Sizer Plus costs $13.99 up front. AC Calculator sells 2 one-off in-app purchases. HVAC Pipe Sizer Plus asks for nothing beyond the download.
AC Calculator holds the better App Store score, 4.8 against 3.0. That said, the two scores are not equally well evidenced: AC Calculator has 20 ratings behind it against 1, so its average is the more settled of the two.
HVAC Pipe Sizer Plus ships an update every 15 months, AC Calculator every 4 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | HVAC Pipe Sizer Plus | AC Calculator |
|---|---|---|
| Price | $13.99 | Free — better |
| Rating | 3.0 (1 ratings) | 4.8 (20 ratings) — better |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 1 | 20 — better |
| Update frequency | Every 15 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 2 MB | 9 MB |
| Age rating | +4 | 4+ |
| Developer | Carmel Software Corporation | Melchisedec Martinez Rodriguez |
Customer experience
HVAC Pipe Sizer Plus
AC Calculator
In-app purchases
HVAC Pipe Sizer Plus
No in-app purchases
AC Calculator
- Unlock View details$4.99
- Unlock Advanced mode$9.99
Questions
Is HVAC Pipe Sizer Plus free?
Is AC Calculator free?
Which has better reviews, HVAC Pipe Sizer Plus or AC Calculator?
Do HVAC Pipe Sizer Plus or AC Calculator have ads?
Which is updated more often, HVAC Pipe Sizer Plus or AC Calculator?
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