How the Right Glazing Keeps Your Home Cool in Summer

Most people think about replacement windows in autumn, when the draughts and cold spots return. But summer comfort is the other half of the story. With UK summers getting warmer, overheating is now a genuine design consideration, and your glazing plays a bigger role than you might expect.

Solar Gain: The Greenhouse Effect in Your Living Room

Solar gain is heat from sunlight passing through glass and warming your rooms. Welcome in January, miserable in July, particularly in south- and west-facing rooms with large windows, where afternoon temperatures can climb well above comfortable levels. Old single glazing and early double glazing do very little to manage it.

How Modern Glazing Helps

Modern glazing units manage solar gain in several ways. Low-emissivity (low-e) coatings reflect heat, keeping warmth in during winter and reducing the amount of solar heat that gets in during summer. Solar-control glass goes further, and is well worth specifying for large south- or west-facing glazed areas, conservatories, and orangeries. Triple glazing also significantly reduces solar gain compared to double, which is one reason it is increasingly popular for big glazed extensions.

Ventilation Matters As Much As Glass

Keeping cool is also about moving air. Trickle vents, now standard on new installations under Building Regulations, provide constant background ventilation without opening windows. Tilt-and-turn windows let you ventilate securely overnight, tilting inward at the top so air flows while the window stays locked. And for summer living, nothing beats opening a wall of glass: aluminium bi-folds and our Slider24 patio doors turn a kitchen or living room into an open, breezy indoor-outdoor space.

Practical Tips for This Summer

Ventilate early and late, when outside air is coolest, and close windows and blinds during the hottest part of the day on sun-facing elevations. If a room consistently overheats, that is a sign worth acting on. When you come to replace those windows or doors, tell our surveyor. Specifying solar-control glass on the right elevations costs far less as part of a replacement than as an afterthought.