The HVAC Quick Load is the one and only rule-of-thumb HVAC heating and cooling load application for the iPhone and iPad.

This app now includes the HVAC Equipment Locator. Click here for details:

This app performs rule-of-thumb HVAC cooling and heating load calculations for many types of commercial, industrial, institutional, and residential buildings. It allows you to quickly calculate the total required cooling and heating loads (in BTU/hr or Tonnage) and air flows (CFM or L/s) by inputting just the building type, total square area and number of people.

You can email all of the inputs and results to any email address. In addition, the email includes an Excel spreadsheet attachment from which you can perform more extensive calculations.

The basis of the calculations for this utility come from various authoritative HVAC texts that list average cooling and heating load values per square foot for many building types.

All values can be displayed in English (IP) and Metric (SI) units.

The following is a sample of some of the types of buildings that can be modeled:

1. Cocktail Lounges, Bars, Taverns, Clubhouses
2. Computer Rooms
3. Dining Halls, Lunch Rooms, Cafeterias, Luncheonettes
4. Hospital Patient Rooms, Nursing Home Patient Rooms
5. Jails
6. Kitchens
7. Libraries, Museums
8. Malls, Shopping Centers
9. Medical/Dental Centers, Clinics, and Offices
10. Nightclubs
11. Offices, Commercial
12. ..... and many more

This app is great for use out in the field to quickly analyze the cooling and heating properties of a building. However, please note, that it is by no means a substitute for rigorous heating and cooling load calculations, and HVAC equipment and materials should not be selected based upon the results from this application.

We also offer the following additional HVAC applications for the iPhone and iPad:

1. HVAC Duct Sizer
2. HVAC Pipe Sizer – Gas Low Pressure
3. HVAC Pipe Sizer - Gas High Pressure
4. HVAC Pipe Sizer – Liquid
5. HVAC Pipe Sizer – Steam
6. Steam Tables
7. Psychrometric Plus
8. Psychrometric LT
9. HVAC Pipe Sizer Plus
10. HVAC Pipe Sizer Gas Plus
11. HVAC Toolkit
12. HVAC Toolkit Ultimate
13. HVAC Residential Load Calcs
14. HVAC Load Plus
15. HVAC Equipment Locator
16. ASHRAE Duct Fitting Database
17. ASHRAE 62.1 Ventilation Load Calcs
18. HVAC Psych HD
19. HVAC ResLoad-J
20. HVAC Residential Load Calcs HD

What’s New

Version 3.9

1. Updated Google Analytics and Crashlytics

Ratings and Reviews

3.0 out of 5
2 Ratings

2 Ratings

Krazycoates ,


Not worth it. Try something else.

Hvacguy100 ,

Good for my HVAC repair biz

It seems like I am always trying to figure out how much cooling and heating a home or small building requires. It's tough to try to get the dimensions and other info, go back to the office and then do extensive load calcs. Most of the time, I just need to do a quick load and this app has really helped me out with that. In fact, I did a quick load on a small office building using this app then compared it to the loads derived from a more detailed app, and the values were within 10%. Not bad for rule-of-thumb. Customers are impressed, too.

AnotherJoe ,

Exceeds my expectations

At first I was skeptical about a load calc app on my iPhone, since it is often so complicated. However, this app is so easy to use and I compared it to more rigorous load calc apps, and amazingly it came within 10% of those calcs.

I like that it has so many different building types built into the database, too.

I look forward to seeing more complex apps in the future. Great work.

App Privacy

The developer, Carmel Software Corporation, 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

    With Family Sharing set up, up to six family members can use this app.

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