How Windows Affect the Efficiency of Your HVAC System

During cold weather, HVAC systems tend to run efficiently since people are less likely to open windows. However, in hot or stuffy conditions, the urge to open windows for fresh air becomes inevitable. It’s important to be cautious, as open windows can significantly impact the efficiency of your HVAC system.

Harder Work

Simply put, when you open a window, your HVAC system has to work harder to compensate for the lost air in order to maintain a consistent temperature. When the window is closed, the HVAC system can operate according to the load it was designed for.

There are times when opening a window is necessary, such as on particularly dry, humid, or stuffy days. In these cases, it’s best to turn off your HVAC system until the windows are closed. This not only prevents your system from overheating but also saves you money—especially with the recent rise in energy costs.

Check the Forecast

While leaving a window open when it’s warm can make a room feel more airy, there’s a risk of your floors getting wet if it suddenly rains—especially during hot weather when heavy thunderstorms are common.

Another potential issue is pollen. If you suffer from allergies, open windows can allow more pollen and other allergens into your home. On days with a high pollen count, it’s worth considering keeping windows closed.