Comparison

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.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

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.

Highlights
  • Calculate BTU/h capacity
  • Recommend equipment types
  • Convert BTU, kW, Kcal, Tons
  • Check price estimates
  • Compare inverter vs. conventional
Features
Read full description

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

HVAC Pipe Sizer Plus4 screens
AC Calculator4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
HVAC Pipe Sizer Plus versus AC Calculator: the parameters behind the verdict, then further details
ParameterHVAC Pipe Sizer PlusAC Calculator
Price$13.99Free — better
Rating3.0 (1 ratings)4.8 (20 ratings) — better
Positive reviews66.7% of reviews—
Number of ratings120 — better
Update frequencyEvery 15 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better18.6
Further details — not scored
Size2 MB9 MB
Age rating+44+
DeveloperCarmel Software CorporationMelchisedec Martinez Rodriguez

Customer experience

HVAC Pipe Sizer Plus

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral33.3%
Negative0.0%

AC Calculator

All ratings20 ratings
Positive95.0%
Neutral0.0%
Negative5.0%

In-app purchases

None

HVAC Pipe Sizer Plus

No in-app purchases

2 purchases

AC Calculator

One-time2
  • Unlock View details$4.99
  • Unlock Advanced mode$9.99

Questions

Is HVAC Pipe Sizer Plus free?
HVAC Pipe Sizer Plus costs $13.99, with no in-app purchases.
Is AC Calculator free?
AC Calculator is free to download, with in-app purchases available.
Which has better reviews, HVAC Pipe Sizer Plus or AC Calculator?
AC Calculator is rated higher. HVAC Pipe Sizer Plus averages 3.0 out of 5 from 1 ratings, while AC Calculator averages 4.8 from 20 ratings.
Do HVAC Pipe Sizer Plus or AC Calculator have ads?
Neither HVAC Pipe Sizer Plus nor AC Calculator shows ads.
Which is updated more often, HVAC Pipe Sizer Plus or AC Calculator?
HVAC Pipe Sizer Plus ships an update every 15 months, and AC Calculator every 4 months. Most recently, HVAC Pipe Sizer Plus was updated on November 1, 2026 and AC Calculator on November 3, 2026.

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