Overview

Version:
7.3
Last updated: 2026-02-16
Ranking
#1,502,558 ▼ 825,475
Overall

Features & Capabilities

The HVAC Duct Sizer app is the #1 selling duct sizing application for the Apple iPhone and iPad. Tens of thousands of happy users have downloaded this useful application for performing quick and simple duct sizing analysis.

The HVAC Duct Sizer is a universal duct sizing app so that it works on both the iPhone and iPad and adjusts its screen size accordingly.

This app includes the HVAC Equipment Locator. Click here for details: http://bit.ly/1BPl1Nr

Just a couple of comments from our users:

"I'll be presenting your iPhone program to my HVAC class as an easy compact tool to have in hand when making sales and service calls." - R. Black

"I like this app and use it daily" - V. Joe

The Duct Sizer application allows you to quickly size one HVAC duct run or a range of duct sizes using the constant friction method. Think of this application as a digital version of the classic Trane Ductulator.

In the "Size by Airflow" mode, 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 results include both the exact and rounded height and width (or diameter) dimensions and the calculated velocity and friction loss.

In the "Size by Dimensions" mode, you can analyze an existing duct system. There are options to input the existing duct dimensions and one of either the airflow or velocity values to derive the calculated duct friction loss.

In the "Range of Duct Sizes" mode, you can specify minimum and maximum friction loss and airflow values to display a range of duct sizes that fall in between the friction loss bounds.

You can specify additional parameters such as the duct shape (rectangular, round, or oval), the air temperature and the air pressure. You can also choose to display values in either English (IP) or Metric (SI) units.

This application uses slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results.

This app now works on your iPhone and iPad and adjusts its screen size accordingly.

Finally, you can email all of the inputs and results from all 3 input modes to perform further analysis using your desktop computer. The email includes HTML text and a .CSV attachment that can be imported into any popular spreadsheet.

The "HVAC Duct Sizer" 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.

This app now includes the HVAC Equipment Locator which allows you to keep track of all of your equipment and store it in the cloud. Click here for details: http://bit.ly/1yTq539

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

User Growth & Download Statistics

App
By:
Carmel Software Corporation
Version:
7.3 Last updated: 2026-02-16
Version code:
882314156
Creation date:
2009-06-02
Compatible devices:
Size:
17.04MB
Price:
190
URLs:
Website ,Privacy policy
Full description:
See detailed description
Source:
Apple Apps Store
Data ingested on:
2026-07-19
Compare stats and ranking:

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.
Developed by:
Carmel Software Corporation
Apple Apps Store
https://apps.apple.com/tw/app/hvac-duct-sizer/id317970395?l=en-GB
Website:
http://www.carmelsoft.com/mobile

User Reviews

I’m an HVAC engineer and I use this at work almost every day. It’s a great way to quickly size a run of duct and easily switch between duct types.
by Ji*****, 2020-03-07

I’ve had this app for 4 or 5 years now, and I can’t believe how use it still is. It’s great that Carmel keeps updating it and now I can use it on my iPad.
by Hv*****, 2014-08-13
View all user reviews ›

Best HVAC Duct Sizer Alternatives

Here are some Apple apps that are similar to HVAC Duct Sizer: