# HVAC - Heating, Ventilation and Air Conditioning

> HVAC reference with equations and tables for professionals. (iPhone/iPad app by Emad Attia.)

- Source: https://appshunter.io/ios/app/hvac-heating-ventilation-and-air-conditioning/id374976036 (this page in markdown: same URL + `.md`)
- Developer: [Emad Attia](https://appshunter.io/developer/366401754)
- Category: Reference, Education
- Price: Free (on sale, was $4.99)
- Rating: 2.40/5 from 5 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 6.0 · 38 MB
- Languages: English, French, German, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Chinese and 1 more
- Released: 2010-06-03
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/hvac-heating-ventilation-and-air-conditioning/id374976036/reviews.md

## What is HVAC?

The ultimate HVAC reference for all HVAC professionals and engineers. This app includes 100s of equations and tables for heating, ventilation, air conditioning and noise. 

A summary of the contents (more is included in the app). 

- Air Conditioning tables and equations for: 
Air Conditioners 
Ammonia - NH3 - Properties
Cooling Loads
Chilled-Water System
Cooling and Heating Equations
Freon Properties
Fruits and Vegetables Optimal Storage Conditions
Heat Gain 
Lights
Air Humidity
Rectangular and Circular HVAC Ducts
Refrigerant R22 - Properties
Refrigerants - Environmental Properties
Sensible Heat Ratio
Thermodynamic Properties of Refrigerant - R22
Water Evaporator and Condenser Equations

- Heating tables and equations for:
Air Heating Systems
Building Elements
Expansion Tanks
Chimneys and Fireplace Sizing
Classifications of Coal, Gas Oil, Boilers and Hot Water Heating Systems
Dowtherm A
Fittings 
Flow Rates in Heating Systems
Flow Temperatures in Hot-Water Heating Systems
Food and Foodstuff 
Greenhouse Temperatures
Heat Carrying Capacity of Copper Tube
Heat Emission 
Heat Loss 
Heat Sources 
Hot Water Heating Systems 
Overall Heat Transfer Coefficients
Safety Valves
Sizing Swimming Pool Heaters
Snow Melting Systems
Static Pressures in HVAC Systems
Thermal Expansion
Units of Heat - BTU, Calorie and Joule

- Ventilation tables and equations for: 
Air 
Fans
Filters
Friction Loss
Heat Recovery
Heaters and Coolers
Hydraulic Diameter
Major and Minor Losses
STP and NTP
Scrubber Basics
Duct Sizing
Efficiency

- Noise/Sound tables and equations for: 
Decibels
Blade Dampers and Pass Frequency
Silencers
Decibel A, B and C
Directivity Coefficient and Sound Attenuation
Ducts
Fans and Noise Power Generation
Noise Attenuation and Rating Curves
Outdoor Ambient Sound Levels
Propagation of Sound Indoors
Propagation of Sound Outdoors
Rotary Heat Exchanger - Noise Attenuation
Sound Absorption Coefficients for some common Materials
Sound Attenuation 
Sound Frequency, Wavelength and Octave
Sound Power, Intensity and Pressure
Sound Transmission


* All Content is Searchable
* All Content is available offline (no need for WiFi or Internet Connection) 
* Please send us any questions, comments or suggestions using our website

## Key features

- Hundreds of equations and tables
- Air conditioning data
- Heating system calculations
- Ventilation formulas
- Noise and sound data
- Searchable content
- Offline access

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/hvac-heating-ventilation-and-air-conditioning/id374976036/reviews.md

### 1/5 — Not good at all!!

*2011-09-11, version 1.0*

So I bought this app thinking the contents may be useful in the field. What I got was alot of formulas with no reference on how to use them or what they mean. As I see it, if you know how to read the info in this app then you shouldn't need to use it. Worthless n should be free. Not $1.99

**Developer response:** We are sorry you are disappointed with our app. We have added a lot of content over the last 6 years and you are correct the content is for advanced HVAC professionals as well as HVAC engineers.

### 1/5 — Hh

*2010-10-23, version 0*

.99 was way too much !! Nothing I need here !!!

### 4/5 — Good for a quick reference

*2010-08-10, version 0*

This all does not calculate anything it is just a reference guide. It's a very good reference and rule of thumb guide with lots of useful equations. The only thing I would add is where the equations and data come from. It looks ASHRAE based but not sure if it is

### 5/5 — FINALLY!

*2010-06-16, version 0*

There seems to be an app for everything stupid, and these guys actually put together some incredibly useful resources with this one. HIGHLY RECOMMENDED, though because I run a building diagnostics firm I upgraded to the Pro version. Can't beat 99 cents though. Buy it.

## Frequently asked questions about HVAC

### What HVAC topics does HVAC cover?

HVAC covers a wide range of topics including air conditioning, heating systems, ventilation, and noise/sound calculations. It includes specific data on refrigerants, duct sizing, heat loss, and sound attenuation.

### Can I use HVAC offline?

Yes, all content within the HVAC app is available offline. You do not need a WiFi or internet connection to access the equations and tables.

### Is HVAC free to download?

Yes, HVAC is available for free. There are no costs associated with downloading or using the core features of the application.

### What devices does HVAC support?

HVAC is supported on iPhone, iPad, and iPod devices. It is designed for Apple's mobile operating system.

### How often is HVAC updated?

The latest version of HVAC is 3.9, which was last updated on April 7, 2017. Users can expect a reference tool with established content.

### What is the user rating for HVAC?

HVAC has a rating of 2.4 stars based on 5 ratings. This suggests a mixed reception from its user base.

### Does HVAC have ads?

The provided data does not specify if HVAC contains advertisements. However, given it is a free reference app, it may include ads.

### What age rating is HVAC suitable for?

HVAC has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

## Version history (last 5 releases)

### 3.9 — 2017-04-07

This app has been updated by Apple to display the Apple Watch app icon.

- Minor updates

### 3.8 — 2017-03-07

- Minor updates

### 3.7 — 2017-02-13

- Minor updates

### 3.6 — 2017-01-17

- Minor updates

### 3.5 — 2016-11-30

- Minor updates

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## More apps by Emad Attia

- [Flow Calculators - Oil & Gas Engineers](https://appshunter.io/ios/app/flow-calculators-oil-and-gas-engineers/id372897824)
- [Thermodynamics Basics](https://appshunter.io/ios/app/thermodynamics-basics/id377187114)
- [EE Basics - Electrical Engineers and Electricians](https://appshunter.io/ios/app/ee-basics-electrical-engineers-and-electricians/id377195573)
- [Fluid Mechanics Basics](https://appshunter.io/ios/app/fluid-mechanics-basics/id377199076)
- [Mechanics Basics](https://appshunter.io/ios/app/mechanics-basics/id380507336)

All apps by Emad Attia: https://appshunter.io/developer/366401754

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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 2026-06-10.*