Our double glazed conservatory gets too hot

John Conlin / 23 July 2018

A reader believes they might have been misled when they double glazed their conservatory roof.



Question

Last autumn we had a new double glazed conservatory roof fitted. We were told that it would be cooler in the summer and warmer in the winter than the traditional plastic type that was originally fitted. During the recent heatwave the temperature reached over 100 degrees F and the conservatory could not be used. Have we been misled?

Answer

The short answer is ‘yes’. It is a common misconception that if double glazing keeps heat in when it is colder outside it will keep heat out when it is colder inside but it does not work that way. Internal heat is infra red and cannot pass through glass, merely warm it up whereas sunlight is ultra violet (UV) and passes straight through the glass.

UV Filter Film applied to the glass will block much of the UV radiation and reduce the solar heating.



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