HVAC Duct Sizer Downloads & RevenueHVAC Duct Sizer · App Store
Not in any tracked top chart right now.
Updated 8 Nov 2026 · rankings refresh through the day
DeveloperCarmel Software Corporation
CategoryUtilities
Price5.99 EUR
Released
Rating★ 3.0 (1)
Version8.5
Age rating4+
First seen by us
30 Sep 2026
30 Sep 2026Installs (est.)1k+ worldwide
📈Dropped out of every chart we track📈New best rank in the overall chart: #85🆕First spotted by AppInsider📦Version 8.5🆕Released on the App Store
Full timeline · 8 events
- 📈HVAC Duct Sizer dropped out of every chart we trackLast seen 14 Oct
- 📈HVAC Duct Sizer new best rank in the overall chart: #85Top Paid · All Apps · ZA
- 📈HVAC Duct Sizer entered the top 100Top Paid · All Apps · ZA
- 📈HVAC Duct Sizer charting in a new countrySouth Africa
- 📈HVAC Duct Sizer entered the top 100Top Paid · Utilities · IT
- 🆕HVAC Duct Sizer first spotted by AppInsider#68 in Top Paid · All Apps · Italy
- 📦HVAC Duct Sizer version 8.51. A modernized interface built around Apple's latest UI/UX guidelines, including a full iPad layout.
2. Reports can be sent as PDF, CSV (Excel), and HTML and by email, text message, or any other Share option.
3. A color picker lets you choose the color of the calculated output values.
4. Fully updated and formatted help.
5. Many smaller refinements throughout.
6. Fixed bug in .csv output where a comma in a number (i.e. - 7,400) splits it into separate cells.… more - 🆕HVAC Duct Sizer released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
3.0 ★
1 ratings
Measured
HVAC Duct Sizer on the App Store
App details
App ID
317970395
Publisher
Carmel Software Corporation
On the store since
Jun 2009
17 years on the store
Minimum OS
iOS 17.0+
iPhone XS and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
1
EN
Size
2 MB
Also listed in
Business
HVAC Duct Sizer downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. App Store downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Business model: Ad-led
How HVAC Duct Sizer makes money: subscriptions, one-off purchases and ads.
Ads · 2 ad networks
Ads
/mo
of revenue
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
3.0 ★
1 ratings
Measured
Ratings
1
Measured
About HVAC Duct Sizer
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.
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.
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 a PDF report, 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.
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
1
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.
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.
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 a PDF report, 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.
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
1
Latest updates
8.5
1. A modernized interface built around Apple's latest UI/UX guidelines, including a full iPad layout.
2. Reports can be sent as PDF, CSV (Excel), and HTML and by email, text message, or any other Share option.
3. A color picker lets you choose the color of the calculated output values.
4. Fully updated and formatted help.
5. Many smaller refinements throughout.
6. Fixed bug in .csv output where a comma in a number (i.e. - 7,400) splits it into separate cells.
