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Selecting Design Conditions

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CoolCalc uses design conditions specified in ACCA tables. It's important to note that heating and cooling design temperatures are not the most extreme temperatures that may occur in your area but rather the typical high/low temperatures that HVAC systems should be designed for in your area. ACCA design temperatures are updated approximately every 5 years.

Cool Calc will automatically select the closest weather station to the home based on distance. However, it will present the user with the nearest five stations in case there is one that more accurately reflects the temperatures for that area. You may override the ACCA specified design temperatures only if local building code allows.

Heating Design Temperature – In the winter, the temperature should remain above this value 99% of the time. This value is automatically populated based on the weather station selection, but can be overwritten.

Cooling Design Temperature – In the summer, the temperature should remain below this value 99% of the time. This value is automatically populated based on the weather station selection, but can be overwritten.

The indoor design temperatures are set to 75 degrees in the summer and 70 degrees in the winter.

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Comments

  • Avatar
    Don Snow

    Why can't we adjust the indoor temperatures like in the beta version?

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    Cool Calc Support

    The indoor design conditions fields exist in our calculation engine, but have not yet been added to the user interface. This is on our roadmap and will be implemented during one of our future code releases.

    Best Regards
    Cool Calc Team

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    patrick ward

    It would be helpful to be able to adjust the indoor temperature. I have customers that want to maintain 72 degrees when its 115 outside

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    Lee Hulse-Smith

    I'm in Toronto and the HVAC inspector won't issue my permit until he sees the Winter Indoor Temperature set to 72 degrees. I was hoping not to do all this by hand, but it's looking like I may not have a choice. Do you have any suggestions?

  • Avatar
    Cool Calc Support

    Hi Lee,

    We have adjusted the indoor temperature to 72 degrees for your project. As of right now we need to do this directly in the database. We will look into adding the capability for users to do this themselves in a future release. ACCA Manual J procedures prevents users from changing the indoor temps which is why we didn't add this capability to the user interface originally, but we understand that some local code enforcers mandate certain temperatures be used. If you run into this again just contact us and we can override the temperatures on our end.

    Best Regards

    Bill

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    Lee Hulse-Smith

    You're the best Bill. Thanks!

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    Stephen Thompson

    in April of 2018 you stated that customizing indoor temperatures "will be implemented during one of our future code releases." That was more than a year ago. This is an extremely important feature that should be easy to release. Should I open a support ticket every time I want to customize the indoor temp for my projects?

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