Airtight roller shutters are useful in Summer, too, as they keep the heat outside. Erik Wilms, CEO of Wilms. ‘You must make sure that the heat does not enter your house. You can only achieve this by installing screens and/or roller shutters. From an energy performance perspective, keeping the heat outside is better than having to turn on the energy-guzzling air-conditioning system. In fact, you will not even need such a system.’
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