Opening a DDY File

The DDY file type is primarily associated with eQUEST.

DDY	File extension: DDY
	File type:	data file

What is a DDY file?

DDY files mostly belong to eQUEST. DDY files are weather design data files used in building energy simulation. They store specific weather inputs that simulate local climate conditions in tools such as eQUEST.
These files include data used to model temperature, humidity, wind, and other weather factors essential for accurate energy analysis.
Details:

They are not plain text files and must be interpreted by simulation software.

They ensure that models receive correct weather parameters during simulation.

They are primarily employed by eQUEST but can also be associated with data from Meteonorm.

FilExt.com note: For additional technical details, visit the eQUEST webpage.

How to open DDY files

You need a suitable software like eQUEST to open a DDY file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your DDY file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a DDY file directly in the browser:. Just drag the file onto this browser window and drop it.

Online DDY Text Viewer

Choose your .ddy file to view

or drag and drop it here

Online File Viewer

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How to extract texts from DDY files or capture a screenshot to PDF, JPG, DOCX, TXT, ...

If you want to extract texts from DDY file or capture a screenshot, you can use our free Online DDY File Viewer:

To do this, click the button "Choose your .ddy file to view" on this page.
Your DDY file will then be displayed in the browser.
Now click on "Save as..." at the top of the page.
Then choose the file format (e.g. JPG, PDF, DOCX, TXT, ...) you want.
Your file will be converted and downloaded.

Programs that open and convert DDY files:

eQUEST
See the previous paragraphs to learn more about the main application. DDY files are often referred to as eQUEST data files because this type of file is primarily created or used by this software.
ASHRAE (Design Conditions Design Day Data) by American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.
ASHRAE = American Society of Heating, Refrigerating and Air-Conditioning Engineers. The identifying characters used for this association are - Hex: 20 21 20 54 68 65 20 66 6F 6C 6C 6F 77 69 6E 67 20 4C 6F 63 61 74 69 6F 6E 20 61 6E 64 20 44 65 73 69 67 6E 20 44 61 79 20 64 61 74 61, ASCII: .!.The.following.Location.and.Design.Day.data. Related links: Wikipedia ASHRAE Page

DDY file extension format:

If you can determine the file format, the associated program can also be determined. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. Frequently, however, one file extension is used by different programs for different file formats, and one file format for different file extensions. So you need a detailed analysis of a file to find out the format and the associated program. Our evaluation of the DDY files is as follows:

The file type with the extension 'DDY' is mainly used by one program with a specific format. However, the following two file formats are common:

97% of all DDY files belong to ASHRAE Design Conditions Design Day data. These files contain text and words, not binary data. The files are on average 28 KB in size and range from 12 KB to 29 KB. The file type is relatively new. The files contain the following words: ! The following Location and Design Day data are produced as possible from the indicated data source and ! Wind Speeds follow the indicated design conditions rather than traditional values (6.7 m/s he. These files can be linked to iwec, tmyx, ishrae, intl, cswd, beijing, cwec and etmy, and have often person-related content.

All other DDY files (3%) have no uniform format. These files sometimes refer to pune, melbourne, airport, bangkok, cityuhk, mumbai, sydney, field, inmet, swera, hong, igdg, itmy, kong or swec. If you want to find out what your DDY file contains, drag and drop it onto this page.

Technical Data for DDY File Extension

File classification:

Data

Identifier:

Hex: 20 21 20 54 68 65 20 66 6F 6C 6C 6F 77 69 6E 67 20 4C 6F 63 61 74 69 6F 6E 20 61 6E 64 20 44 65 73 69 67 6E 20 44 61 79 20 64 61 74 61, ASCII: .!.The.following.Location.and.Design.Day.data (provided by TrID database)

Related files:

epw, tm2, tmy, wth, stat, ddy2, clm, wea, binm, rain, zip, txt, nc, rar, ris, xml

Related links:

Wikipedia ASHRAE Page

a ddy data file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with DDY files

Associate the DDY file extension with the correct application.
Update your software that should actually open data files. Because only the current version supports the latest DDY file format. Search, therefore, e.g. on the manufacturer website after an available eQUEST update.
To make sure that your DDY file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .DDY file online - secure, fast, and no downloads needed.