How to open DDY files

Did your computer fail to open a DDY file? We explain what DDY files are and recommend software that we know can open or convert your files.

What is a DDY file?

The DDY file extension indicates to your device which app can open the file. However, different programs may use the DDY file type for different types of data.

We are aware of 1 different use of the DDY extension, which you can read more about below.

ASHRAE Design Conditions Design Day data

Through our analysis of DDY files, we know that one use of the format is ASHRAE Design Conditions Design Day data. We have not yet described in detail what these files contain and what they are used for, but our team is working tiredlessly through thousands of file formats. We'd love hearing from you if you have information about the format.

We have not verified any programs yet that works with this specific format. If you know any, please use the 'Suggest a program' link below. Thanks!

Software that will open, convert or fix DDY files

These apps are known to open certain types of DDY files. Since many different programs may use DDY files for different purposes, you may need to try a few of the apps to open your specific DDY file.

IDF EditorIDF EditorUser submitted
We have not verified any programs that we know for certain can work with DDY-files on Mac. If you know one, please use the Suggest link below and tell us about it!
We have not verified any online services that we know for certain can work with DDY-files. If you know one, please use the Suggest link below and tell us about it!