Best Thermostat Settings for Summer in Madrid

Learn how to adjust your thermostat and leverage smart home tech to maximize comfort in your home and minimize electricity costs during heatwaves.

The 18°C Myth: Why It Doesn't Cool Faster

One of the most common mistakes when arriving home on a hot August day in Madrid is turning on the AC and dropping the thermostat to 18°C, thinking the room will cool down faster. The reality is that the air conditioner will blow air at exactly the same cold temperature, regardless of whether you set it to 18°C or 24°C. The difference is that by setting it to 18°C, the compressor will never stop, consuming a disproportionate amount of energy and turning the room into an uncomfortable fridge.

The Ideal Temperature Recommended by Experts

The Instituto para la Diversificación y Ahorro de la Energía (IDAE) and climate control experts agree: the ideal temperature in summer should be between 24°C and 26°C. This range guarantees a cool environment and keeps electricity consumption under control. Remember that for every degree you lower below 24°C, your energy consumption will increase by approximately 8%.

Settings for Sleeping: "Sleep" Mode

During the night, human body temperature naturally drops. Sleeping with the AC at 22°C is not only a waste of energy, but you will likely wake up with a cold or a sore throat. Use the "Sleep" or "Night Mode" function on your remote control. This smart feature gradually increases the temperature by 1 or 2 degrees during the night and reduces the fan speed to the minimum, ensuring absolute silence, perfect thermal comfort for resting, and minimal consumption.

The Power of Scheduling and Smart Home Automation

Don't leave the AC on all day "so the house doesn't get hot." Use the timers on your remote so the unit turns on about 30 minutes before you arrive home. Even better, invest in a smart thermostat with Wi-Fi connectivity. These devices allow you to turn on the AC from your smartphone, and they can even use geolocation to automatically turn off the system if everyone has left the house.

The Importance of the "Dry" Mode (Dehumidifier)

In Madrid, after a summer storm or when calima dust pushes up from the south, relative humidity can spike and make the perceived temperature feel much higher. On these days, instead of using the cooling mode (Cool / snowflake icon), try using the Dry mode (water drop icon). This mode makes the fan spin slower, extracting moisture from the air without overcooling the room. The result is an incredibly fresh and comfortable environment with much lower energy expenditure.