How To Stop Your Home Overheating
Your home overheating is a critical aspect that should not be overlooked, especially as our climate shifts to warmer conditions. Retrofitting with insulation, while effective in reducing winter heat loss, can pose challenges, increasing the risk of overheating during the summer if not appropriately modelled and designed.
Most of us know the feeling. It’s a hot day, you close the windows to keep the heat out, and somehow your home still feels like it’s overheating.
With summers getting hotter and heatwaves becoming more frequent, overheating at home is a growing problem. The good news is there’s a lot you can do about it, whether you’re planning a full retrofit or just looking for some quick wins.
Why does my home overheat?
Heat builds up inside your home from two main sources.
The first is the sun. South-facing windows in particular can let in a lot of solar heat during the day, more than you might expect.
The second is everything going on inside. Your lighting, cooking, electronics, and even the people in the room all generate warmth. On their own, none of these feels like much. Together, especially on a hot day, they add up fast.
Does blocking the sun stop my home from overheating?
The most effective thing you can do is stop heat entering in the first place. It’s much easier than trying to cool a room down once it’s already warm.
External blinds, shutters, or fixed overhangs above windows can make a real difference – especially on south-facing elevations. If external shading isn’t possible, solar film applied to your glazing is worth considering. It reduces the amount of heat coming through the glass, and as a bonus, it can also help retain warmth in winter.
If you’re not sure what’s right for your home, our forum is a great place to ask – free to use, and full of trusted professionals ready to help.
How can I ventilate my home to stop it from overheating?
The aim is cross-ventilation: opening windows on opposite sides of your home to let cooler air flow through and push warm air out. Early morning and late evening are your best windows – when outside air is cooler than inside.
During the hottest part of the day, keep windows closed and blinds drawn. You’re trying to keep the cool air in, not let the hot air in.
Mechanical cooling, like air conditioning, is an option, but it’s worth exploring lower-carbon measures first. A well-ventilated home, combined with good shading, can stay surprisingly comfortable without it.
Think about your whole home
If you’re planning to make your home more energy-efficient, overheating is worth thinking about from the start – not treating as an afterthought.
Thermal modelling can help here. It looks at your home’s specific conditions: which way it faces, how exposed it is to the sun, local weather patterns, and more. Homes that face south or sit in exposed spots particularly benefit from this kind of analysis, because getting the shading and ventilation right from the beginning makes a big difference to how comfortable your home feels year-round.
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