What Are the Best Window AC Units for Casement (Side Sliding) Windows?
When you think of cooling solutions, HVAC packaged units / AC units often come to mind. But not every situation calls for a full installation. If you're trying to cool a specific room—especially one with a non-traditional window style like a casement or side sliding window—you need a more targeted solution. That’s where specialized window AC units come into play. Some newer options even offer remote control features for added convenience.
Can I Put an AC Unit on a Side Sliding Window?
Casement or side sliding windows open horizontally rather than vertically. This makes them incompatible with most air conditioners. This makes them incompatible with most standard window AC units. Most equipment is designed to be set in an upward-sliding sash. That means that traditional units won’t fit or seal correctly in a side sliding frame. Fortunately, there are models that will.
Using a window AC for horizontal sliding window installations requires careful attention to both sizing and mounting. Products labeled as horizontal window air conditioner units are typically taller and narrower. That way, they’ll fit vertically into the window frame. Most brands offer a horizontal sliding window AC kit as part of their setup for easy installation. This includes your mounting supports and side panels that help fill in gaps and create an airtight seal. These features are especially useful when dealing with limited window space or irregular frame sizes.
Do They Make Air Conditioners for Windows That Slide Sideways?
Air conditioners for windows that slide sideways or open like casement windows are different from traditional ACs, but they do exist. A casement window air conditioner is often built in a vertical format to fit the taller, narrower space. Some models are actually categorized as vertical window ACs for sliding window applications. Both are the same.
When shopping for the best air conditioner for a horizontal sliding window, look for features such as multi-directional airflow, energy efficient ratings, and adjustable fan speeds. Brands like Frigidaire and Perfect Aire offer some of the best casement window air conditioner units that come with everything you need for installation, including a complete installation kit. Just make sure you’re getting the right setup. If you're dealing with a uniquely shaped window, always verify that the unit includes a horizontal sliding window AC kit for solid installation and sealing.
How Do You Install a Window Air Conditioner in a Casement or Side Sliding Window?
Installing an AC unit in a casement or sliding window requires a slightly different approach compared to standard double-hung windows. First, select a model designed for vertical installation. Next, use a horizontal sliding window AC kit or the hardware included with your casement window air conditioner. These are specifically designed to create a secure base and use side panels that seal off the rest of the window opening. Many models also offer sleep mode, which maintains comfort while saving energy during nighttime hours.
Before you make your purchase, you can measure the window opening to make sure it will be compatible. Then you’ll place the unit into the window opening vertically and use the mounting bracket to hold the unit in place. After that, slide the side panels or kit panels into place and secure them according to the instructions. From there, you can use insulation foam or weather stripping to give your space a tight seal. A washable filter is another convenient feature that simplifies regular maintenance and ensures cleaner air output.
What’s more, if you’re installing a vertical window air conditioner, make sure to follow all safety steps carefully. This is especially important if the unit is heavy or will be exposed to wind. You don’t want it falling over! Some of the quietest window AC units also include vibration-dampening components to further improve user comfort.
What Is the 3-Minute Rule for Air Conditioners?
The 3-minute rule is a crucial guideline when operating any air conditioner, including smart window air conditioner care. It refers to waiting at least three minutes after turning off the unit before restarting it. This short pause protects the compressor from pressure buildup. It also works to minimize any electrical stress of being restarted too soon.
Ignoring this rule can lead to short cycling, reduced efficiency, and long-term damage. The rule is also important for air conditioner troubleshooting. You’ll get better results by waiting just a little bit longer. For units with inverter AC technology, this practice helps preserve the compressor’s longevity even more effectively.
Find What You Need at Surplus City HVAC & Supplies
Surplus City specializes in HVAC replacement parts, hard-to-find components, and discounted new systems. If you decide that a window unit isn’t for you, then we’ve got you covered. Whether you’re upgrading an existing system or need repair parts for your HVAC equipment, you can count on us for big savings. Plus, with multiple warehouse locations across the U.S., we ship fast, so you can get your system back up and running in no time.