# HVAC-calculator

> HVAC calculations for energy use, airflow, and duct dimensions. (iPhone/iPad app by Trond Rossvoll.)

- Source: https://appshunter.io/ios/app/hvac-calculator/id602391404 (this page in markdown: same URL + `.md`)
- Developer: [Trond Rossvoll](https://appshunter.io/developer/571419518)
- Category: Productivity, Utilities
- Price: $4.99
- Rating: 4.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 14 MB
- Languages: American English, Norwegian Bokmål
- Released: 2013-03-01
- Data updated: 2026-08-19
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/hvac-calculator/id602391404/reviews.md

## What is HVAC?

HVAC Calculator is an app that performs many calculations that are useful to have available for anyone working with or have interest in HVAC and energy use in buildings.

The app performs many of the calculations that you never remember the formulas for when you need them for quick calculations, for example in a meeting or out on the construction site. Many of the calculations can also be a bit difficult to calculate with a normal calculator. Now you can perform these calculations easily on your iPhone/iPad.

The app is universal, so you only have to buy it once to use it on both iPhone and iPad.

The app helps you calculate all this and more:
-SFP from measured/design fan power and airflow
-SFP at reduced airflow for VAV ventilation
-SFP at design conditions or maximum performance for VAV ventilation
-Temperature efficiency of heat recovery
-Temperature after heat recovery unit (HRU) in air handling unit (AHU)
-Temperature of exhaust air from air handling unit after heat recovery
-Actual temperature efficiency of heat recovery when the exhaust temperature is limited to minimum 5°C for reuse as frost free garage ventilation
-Air velocity in ducts with known dimensions and airflow
-Maximum airflow in a duct with dimensions  and maximum air velocity as specified requirements
-Dimensions of rectangular and circular spiral ducts for specified air flow and velocity requirements
-Pressure drop in Pa/m for rectangular and circular spiral ducts
-Equivalent diameters for rectangular ducts
-Hydraulic diameter for rectangular ducts

## Key features

- SFP calculations
- Heat recovery efficiency
- Air velocity in ducts
- Duct dimensioning
- Pressure drop calculations
- Equivalent diameters

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/hvac-calculator/id602391404/reviews.md

### 5/5 — 不错

*2016-11-24*

很小众的软件，但够专业

## Frequently asked questions about HVAC

### What calculations does HVAC-calculator perform?

HVAC-calculator performs a variety of calculations including SFP (Sensible Heat Factor), heat recovery efficiency, air velocity in ducts, duct dimensioning, pressure drop, and equivalent diameters for rectangular ducts.

### Is HVAC-calculator available on multiple devices?

Yes, HVAC-calculator is a universal app and can be used on both iPhone and iPad after a single purchase.

### How often is HVAC-calculator updated?

The latest version of HVAC-calculator is 2.2, which was released on December 15, 2015. Updates are not frequent, with the last update being several years ago.

### What is the price of HVAC-calculator?

HVAC-calculator is a paid app priced at $2.99. There are no in-app purchases or subscription fees.

### What is the age rating for HVAC-calculator?

HVAC-calculator has an age rating of 4+, making it suitable for a wide range of users.

### Does HVAC-calculator have ads?

No, HVAC-calculator does not contain advertisements. It is a paid application that offers an ad-free experience.

### What is the user rating for HVAC-calculator?

HVAC-calculator has a rating of 4.0 stars based on one user review.

### Can HVAC-calculator be used offline?

The description implies that calculations can be performed easily on your iPhone/iPad, suggesting offline functionality for its core features.

## Version history (last 5 releases)

### 3.0 — 2026-06-25

Update for iOS/iPadOS 16 and later

### 2.2 — 2015-12-15

This update from Apple will improve the functionality of this app. No new features are included.

-Updated SFP calculations
-Fixed an issue with iOS9 for Norwegian users

### 2.1 — 2014-03-28

Updated/New
-English translation. If the Swedish and Danish users want Norwegian instead of English language must be over Norwegian English in the language list on the iOS. To fix this go to settings in iOS and switch to Norwegian language, and then back to the Swedish/Danish.
-50mm resolution for dimensions when sizing square ducts
-Sliders to change the dimension of square ducts and for adjusting the size
-All duct calculations (speed, airflow and sizing) now also shows the pressure drop in Pa/m
-Removed Norwegian technical regulations for non-Norwegian users

Fixed:
-Calculation of equivalent diameter for square duct did not work on iPad
-In iOS 7 icons were changed back iOS 6 icons when clicked they , this is now fixed

### 2.0 — 2013-11-12

No release notes.

### 1.2 — 2013-09-07

No release notes.

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## More apps by Trond Rossvoll

- [Norwegian Holidays](https://appshunter.io/ios/app/norwegian-holidays/id738897594)
- [Week numbers with widget](https://appshunter.io/ios/app/week-numbers-with-widget/id795134805)
- [widget weather](https://appshunter.io/ios/app/widget-weather/id908649054)
- [widget weather lite](https://appshunter.io/ios/app/widget-weather-lite/id1130588506)

All apps by Trond Rossvoll: https://appshunter.io/developer/571419518

## Related topics

[roofing ventilation calculator](https://appshunter.io/ios/topics/roofing-ventilation-calculator)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-19.*