How to stay cool this summer


Now that summer has arrived, although it feels like autumn, you will soon face those balmy nights wishing you knew how to stay cool this summer.

Most homes have had some sort of double glazing fitted, much of it inappropriate because whilst it may be compliant with FENSA many styles of window fail to meet the air change per hour requirement of the building regulations.

Why is this important, well its the ease that air gets changed that determine the how stuffy a room is, how much moisture is trapped inside the room and how cool you will be.

What Is the Best Way to Stay Cool This Summer?

Without doubt, the best method of getting a cool breeze and free air conditioning, is to encourage natural convection of air. Everyone knows warm air rises, so cooler air will naturally fall to the floor, in turn helping push more warm air towards the ceiling. If you open windows at the top and bottom (like sash windows) then you’ll get a massive increase (called purge ventilation) over most other styles of window.

All new buildings need to demonstrate the windows will enable a minimum of 4 air changes per hour, the regulations for replacements states they should also comply, however it is incredibly difficult to measure air changes so this requirement is often overlooked.

Using sophisticated computer modelling, we have seen reports that suggest compliant windows like top or bottom half windows with fixed lights, only produce 2.8 air changes per hour, not 4.


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