How to create cross ventilation in your home to keep cool this summer

How to create cross ventilation in your home to keep cool this summer

Achieving optimum airflow throughout your home can be a challenge, especially in summer, but it’s worth the effort.
Once you’ve mastered natural ventilation techniques to cool down your house, you won’t be as reliant on your air conditioner. In turn, this means less expensive energy bills. In this article, we outline how you can encourage cross ventilation, which is one of the most effective natural ventilation methods, in your house. You don’t need any fancy equipment to get started – just your windows and doors!

How to create cross ventilation.

To begin, see which direction the breeze is flowing and then open the windows on that side of the room. Next, cross to the opposite side of the room and open the windows – or door to the outside, if there’s no window – on that side. This should create a current of air across the room, entering via the window on the side of the house exposed to the wind, and exiting through the other window or door opposite it, taking any hot or stale air lingering within the room with it. This is cross ventilation.

How to create cross ventilation when there’s no breeze.

If there is not a puff of wind to speak of, you can get the air moving in the right direction through your home with the assistance of a fan or two. If you have two pedestal fans, set one up at the window on the shady side of your room. Make sure the front of the fan is facing into the room. Place the second pedestal fan at the opposite window, with the front of the fan facing the outside. Turn them both on and the first fan at the inlet window should suck cool air into the room. The second fan at the outlet window draws the current through the room and pushes any warm, stagnant air outside.

The best types of windows for cross ventilation.

If you have windows or doors on the opposite sides of the room from one another, you should be able to achieve cross ventilation. However, hot air rises, which means cross ventilation is far more effective when the window that the breeze is flowing through is opened at the bottom and the window at the opposite side of the room is opened at the top. This process encourages the warm air gathering at the roof to be pushed through the room to the outside. So what type of windows can be opened at both the top and the bottom? That would be double hung windows! Double hung windows allow you to change the configuration of your sashes according to the direction that the breeze is flowing so that you can always have cross ventilation in your home.

Natural ventilation for rooms with only one window.

Double hung windows utilise two moveable windows sashes so that you can have the window open at both the top and the bottom. Sash balances are the spring mechanisms that allow for the window sashes to move smoothly, one in front of the other. Double hung windows are particularly good for promoting natural ventilation in rooms that cannot achieve cross ventilation. In this instance, you can open both the bottom and the top of the double hung window and the cool air will enter through the lower opening, while the stagnant air escapes through the top. It isn’t quite as effective as cross ventilation, especially when there is a breeze, but it allows fresh air to enter the room and hot air to leave.


Interested in installing double hung windows in your home to promote better airflow and natural ventilation? Contact Unique Windows today to discuss the best types of sash balances to have your window sashes gliding effortlessly within their frames.

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