Comparison

HVAC Toolkit vs Pipe Sizer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

Pipe Sizer

This app helps water piping system engineers and designers quickly and accurately design and analyze piping systems. It offers direct input for flow, friction, or velocity, with live calculation updates and support for various units and pipe materials.

Highlights
  • Quickly size new piping systems
  • Analyze existing piping systems
  • Direct input for flow, friction, or velocity
  • Live calculation updates
  • Supports SI and IP units
  • Works with steel, copper, and PVC pipes
  • Includes fluid data for water and glycols
Features
Read full description

The Pipe Sizer App for iOS has been designed to help water piping system engineers and designers quickly and accurately design new piping systems, and analyze existing pipping systems. Quickly size new and analyze existing piping systems on your iPhone or iPad. • Enter flow, friction rate or velocity numbers directly for maximum accuracy. • Use the sliders for quick calculations. • Calculations update live, giving you quick feedback on your design. • Lock flow rate, friction rate or velocity to size the pipe based on your input criteria. • Works for both SI and IP units. • Supports steel, copper and PVC piping. • Includes fluid data for: • Water • Ethylene glycol (10-90% by volume) • Propylene glycol (10-90% by volume) Put your plastic sizing wheel in the drawer. Have a modern design tool with you wherever you go. Note: This application (App) is provided for use by qualified piping system engineers and designers and is not a substitute for appropriate design services. When in doubt, contact a design professional.

Screenshots

HVAC Toolkit4 screens
Pipe Sizer2 screens

Verdict

The call

The clearest difference is price: Pipe Sizer at $12.99 against HVAC Toolkit's $23.99. Pipe Sizer also leads on review sentiment (100% vs 73%) and ratings volume (10 vs 2). HVAC Toolkit's advantage is update cadence (every 6 months vs every 17 months) and rating (5.0 vs 4.8). 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

CostPrice · In-app purchases · Ads · Monetization

HVAC Toolkit costs $23.99 and Pipe Sizer $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

HVAC Toolkit holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Pipe Sizer has 10 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 73% of HVAC Toolkit's written reviews are positive against 100% of Pipe Sizer's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

HVAC Toolkit ships an update every 6 months, Pipe Sizer every 17 months. The most recent releases landed on September 14, 2026 and September 20, 2026 respectively.

Scorecard6 real differences · 4 level
HVAC Toolkit versus Pipe Sizer: the parameters behind the verdict, then further details
ParameterHVAC ToolkitPipe Sizer
Price$23.99$12.99 — better
Rating5.0 (2 ratings) — better4.8 (10 ratings)
Positive reviews73.3% of reviews100.0% of reviews — better
Number of ratings210 — better
Update frequencyEvery 6 months — betterEvery 17 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS13.0 — better16.6
Further details — not scored
Size50 MB2 MB
Age rating4+4+
DeveloperCarmel Software CorporationPheinex, LLC

Customer experience

HVAC Toolkit

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews15 reviews
Positive73.3%
Neutral0.0%
Negative26.7%

Pipe Sizer

All ratings10 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

HVAC Toolkit

No in-app purchases

None

Pipe Sizer

No in-app purchases

Questions

Is HVAC Toolkit free?
HVAC Toolkit costs $23.99, with no in-app purchases.
Is Pipe Sizer free?
Pipe Sizer costs $12.99, with no in-app purchases.
Which has better reviews, HVAC Toolkit or Pipe Sizer?
HVAC Toolkit is rated higher. HVAC Toolkit averages 5.0 out of 5 from 2 ratings, while Pipe Sizer averages 4.8 from 10 ratings.
Do HVAC Toolkit or Pipe Sizer have ads?
Neither HVAC Toolkit nor Pipe Sizer shows ads.
Which is updated more often, HVAC Toolkit or Pipe Sizer?
HVAC Toolkit ships an update every 6 months, and Pipe Sizer every 17 months. Most recently, HVAC Toolkit was updated on September 14, 2026 and Pipe Sizer on September 20, 2026.

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