Daylight Factor

This exports window information to a daylight factor spreadsheet by Mark Siddall of LEAP. It helps you plan window sizes which give enough daylight without over-provision. Good windows have 5x the heat loss of a good wall so it is important not to over size them.

For more information on the AECB Daylight Guidance click here
Training and explanation videos on the Daylight Factor sheet can be found here
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