The time it takes to cool down a room after opening the windows to let in cool air from outside depends on various factors, including the temperature difference between the inside and outside, the size of the room, the level of insulation, and the airflow rate.
Temperature difference: The greater the temperature difference between the inside and outside, the faster the cooling process will be. If the outside air is significantly cooler than the inside air, you'll experience a quicker cooling effect.
Room size: The size of the room plays a role in determining how long it takes to cool down. Larger rooms will take longer to cool down compared to smaller ones.
Insulation: Well-insulated rooms retain heat more effectively, which means they might take longer to cool down compared to poorly insulated spaces.
Airflow rate: The rate at which cool air enters the room and displaces the warm air affects the cooling speed. A higher airflow rate, such as from a fan or cross-ventilation, will speed up the cooling process.
Humidity: High humidity levels can hinder the cooling process. Dry air tends to absorb heat more efficiently than moist air.
Outdoor conditions: The external environment, including factors like wind speed and direction, can influence how quickly cool air enters the room.
It is challenging to provide an exact time frame for how long it takes to cool down a room since each situation can be different. In some cases, you might feel a noticeable temperature drop within a few minutes, while in others, it could take more time, especially if the room has high thermal mass (e.g., concrete or brick walls) that retains heat.
If you want to expedite the cooling process, you can use fans to facilitate air circulation and open windows strategically to create cross-ventilation. Additionally, drawing cool air from the lower part of the room (if possible) and expelling warm air from the top can be more effective.
Remember that the outdoor temperature and weather conditions will play a crucial role, so if the outside air starts warming up again, the cooling process will slow down or reverse.