According to the AEMET, this month of July 2026 has been the hottest month recorded in Spainwith a provisional average of 25.7 ºC. This fact, added to the numerous heat waves that are being experienced this summer, has caused many people to find themselves looking for the most effective options to insulate their homes from the high temperatures outside.
Even though the air conditioner has become a household appliance essential in most Spanish homes to cope with the heat, this can also have its disadvantages. Beyond its enormous energy expenditure, which means that the electricity bill ends up rising during the summer months, its continued use also can cause respiratory problems or dry skin and eyes.
Therefore, some people look for how keep the cold in your homes without having to use air conditioning or, at least, reducing it to the maximum. For these people, the architect and YouTube content creator, Edu Sanz, has the definitive answer to their problems. The young man, an expert in home analysis, explains that the most essential thing to keep a home cool without using electricity is natural ventilation.
The architect recommends installing casement windows with good insulation
“What natural ventilation uses is the wind to create movement inside without the use of mechanical systems“, he explains. To do this, the location of the windows is key, since we must try to achieve a cross ventilation effect that allows air to pass through the building. This “allows you to improve the healthiness of indoor air and also significantly reduces the need for the use of air conditioning equipment.”
This effect is achieved by opening windows on opposite sides of the housewhich will allow fresh air to enter and prevent heat from concentrating in the rooms. However, the location of the windows is as important as the type and quality of insulation it offers. “Never, never, never skimp on the quality of your windows. Because it will be of no use to have good insulation on the façade if the cold or heat is sneaking in through the window glass itself.”
Therefore, if a home renovation can be carried out, the most advisable thing is to installation of casement windows“instead of sliding, because we are going to double the ventilation percentage,” advises the architect. These are the most effective in preventing outside temperatures from affecting the interior of the home.
Natural ventilation will also improve sleep quality
It will also be necessary to check and maintain in correct condition the window frames or blind drumwhere the heat from the street may also be entering. Or, if you already have quality windows but do not notice their benefits, it may be because they are not correctly installed and “are generating a thermal bridge“recalls Edu Sanz.
This measure, although it may involve a somewhat high cost, will allow you to enjoy a cooler home and in which it will not be necessary to turn on the air conditioning, at least for a long time. Furthermore, also will improve sleep quality at night, since good ventilation reduces the concentration levels of carbon dioxide and particles in the air, which promotes deeper sleep with fewer awakenings.
For all these reasons, investing in quality windows with good insulation will not only help reduce your electricity bill, but also avoid having to turn on the air conditioningbut it will also improve the quality of life and sleep of the people who live in the home. Especially in seasons with more extreme temperatures, such as summer or winter.