Opening a window to let in some fresh air is one of the best parts of transitional seasons. Adding a dedicated window fan into the mix can extend these benefits even further, stimulating air circulation and equalizing humidity and temperature levels.

For any season or situation where indoor air quality is less than ideal, or for proper ventilation of dust, chemicals, and other allergens that can stagnate inside, a window fan is an affordable and simple-to-install way to ensure you breathe comfortably all year round.

Here are a few of the best window fans currently on the market.

Best overall: Air King 9166F 20″ Whole House Window Fan

Ventilation For Any Situation

Commercial-grade performance with a simple-to-use front-mounted rotary switch. Amazon

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This 20-inch fan from Air King is a great traditional window fan solution that doesn’t require removal every time you need to close the window. Its unique “storm guard” feature allows for semi-permanent installation and the sealing off of openings when needed. The frame is constructed from durable powder-coated steel and plastic, and its three-speed motor can move up to a whopping 3,560 cubic feet of air per minute—plenty enough for any ventilation situation.

Best digital: EcoBreeze 2.1

Lookout Humidity!

It comes standard with a MERV 8-level air filter to rid the air of particles and allergens before it’s circulated. Amazon

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Here’s a unique window fan that’s designed to actively monitor indoor and outdoor temperatures and bring in cool air only when it’s warmer inside. Though it has the appearance of a traditional air conditioner, it uses much less power, instead of relying on smart detection of humidity and temperature levels to constantly equalize the air in your environment.

Most versatile: BEYOND BREEZE 9″ Twin Window Fan

Portable Choice

Includes two removable feet for freestanding operation. Amazon

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Beyond Breeze’s compact dual window fan is arguably the most flexible choice on this list thanks to a portable design that’s intended for both window and floor use. It offers two high-velocity speed settings, fully reversible airflow, and fits in window spaces between 22.4 and 34.3 inches with the use of the included spacers. A unique exchange function even lets one nine-inch fan blade push indoor air out while the other pulls in fresh air from outside.

Budget pick: Comfort Zone 20″ 3-Speed Box Fan

Practical Industrial Choice

Equipped with a handle on top for ease of portability. Amazon

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Nothing beats the design of a classic box fan for a quick way to improve indoor air circulation. This 20-inch model from Comfort Zone is great for pushing air from one room to another and makes a great ventilation solution in kitchens, bathrooms and workspaces. A simple three-speed rotary switch and a durable, industrial metal frame belie this fan’s versatility and portability. It fits perfectly in most windows since it’s only five inches deep, but it’s also sturdy enough to stand on its own.