You Can Do Better Than Window AC Units: The Sleeker Alternative To Get Instead

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If you've been struggling to beat the sweltering heat this summer, you're not alone. July of 2026 was the hottest month on record in the contiguous U.S. at the time of writing, according to the National Oceanic and Atmospheric Administration (NOAA). At times like these, having air conditioning is a near necessity — but not every home or apartment can support central AC. Instead, you might have to use a smaller AC unit to keep cool. For many people, window air conditioners are the go-to, but there is a better option out there: over-the-sill AC units (also known as saddle or inverted U-shaped air conditioners). Both types of air conditioning units are installed in a window, but they're positioned differently.

Here's how an over-the-sill air conditioner works: Rather than fitting fully inside an open window, they straddle the sill. The fan and control panel sit inside your house, while the compressor goes outside. If there are gaps between the unit and the window frame, you can add pieces of foam to create a tight seal.

You can find saddle AC units for sale at home improvement stores or from online retailers. For an example of what they look like, check out the Electactic U-Shaped Window Air Conditioner on Amazon. Reviews for this specific product are largely positive, and it has an average rating of 4.1 out of 5 stars. One 5-star reviewer offered some positive feedback and installation advice: "The foam that comes with [it] does a good job of keeping drafts and bugs out... Because it doesn't sit on top of the windowsill, it hangs lower. So you will need to make sure there is no furniture blocking the air."

These appliances have two major advantages over traditional window AC units. First, since they hang over the sill (rather than going into the window itself), they don't interfere with your view or block sunlight. You can also open and close your window freely. On top of that, since the mechanical components are outdoors (and the window gaps are sealed), saddle air conditioners tend to be much quieter than traditional window units.

However, while over-the-sill units eliminate those particular downsides of window air conditioners, there are other drawbacks to consider before buying one. For one, they're often more expensive than regular window models. Here's an example: The over-the-sill AC unit we highlighted above costs $360. Meanwhile, the manufacturer also sells the Electactic Window Air Conditioner through Amazon. Both products have a 10,000 BTU cooling capacity, but the traditional window unit costs $90 less.

It's also important to mention that not all windows can accommodate these kinds of air conditioners. Specifically, if your sill is larger than the unit's opening (as a Reddit user describes in this post), you won't be able to install one. This was a common theme in Amazon reviews of the Electactic over-the-sill air conditioner as well, with several shoppers saying that installing the unit was challenging. Others reported that it was louder than they expected, too.