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
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
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:
Friction Loss
Heat Recovery
Heaters and Coolers
Hydraulic Diameter
Major and Minor Losses
Scrubber Basics
Duct Sizing

- Noise/Sound tables and equations for:
Blade Dampers and Pass Frequency
Decibel A, B and C
Directivity Coefficient and Sound Attenuation
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

What’s New

Version 3.9

This app has been updated by Apple to use the latest Apple signing certificate.

- Minor updates

Ratings and Reviews

3.0 out of 5
2 Ratings

2 Ratings

Jlaffradi ,

Hvac Service manager

Very useless app. Nothing but formulas that you can easily get from a text book. Not even worth 2 bucks.

App Privacy

The developer, FPC Ltd., has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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