What is a Casement Window Air Conditioner?

Casement windows are a nice touch for any home, especially in kitchens and bathrooms. However, for rooms lacking traditional windows, it can be a challenge to cool them with a regular window air conditioner.

This is where the casement window air conditioner comes in.

In this guide, we explain what a casement window AC is, what makes them different from other types of room air conditioners, and how to select the right one for your casement window.

What is a Casement Window Air Conditioner?

As the name suggests, a casement window air conditioner is specifically designed to fit casement windows. 

Casement windows are windows that are hinged on the side, and which open outwards through a crank handle. Compared to most other windows, a casement window can be opened all the way.

Traditional window air conditioners have  a rectangular shape with more width than height. While some offer accordion seals to fit sash windows, they are still an ill fit for casement windows since it will leave a large gap vertically. 

Casement window ACs are narrower in shape. They are made to fit windows that swing out vertically, and are at least 20 inches in height. They may also come with precut window inserts to fit most casement window designs. 

Casement Window Air Conditioner vs Other Window ACs

It can be easy to confuse casement window air conditioners with other types of window AC units. Here are the differences:

Type	Description
Casement window AC	Narrow body: taller than wider to fit casement windows
Window air conditioner	Box type body: wider than taller
Sliding window AC / slider AC	Window ACs made for sliding windows using a window installation kit to fill the gap

Casement Window AC: Commonly Asked Questions

Can You Install a Regular Window AC in a Casement Window?

Some owners opt to use a traditional window air conditioner on a casement window. We do not recommend doing this for the following reasons:

• You will need a wooden frame or metal bar to replace the lower sash, while the window glass will have to be covered with wood.
• Such ad hoc installation can result in air leaks or lower insulation.
• It becomes a security risk.
• The window AC may fall out over time.
• It ruins the aesthetics of your home.

Casement Window Air Conditioner vs Portable AC

Some homeowners opt to use portable air conditioners instead of casement window ACs.

The difference between the two is that portable ACs typically sit on the floor. They may either be vented (which requires an exhaust hose going out to the window), or ventless, which are less efficient but don’t require any windows to vent the exhaust.

They are generally moreexpensive for the unit itself but can be cheaper to install. However, portable ACs take up floor space, particularly vented models that require a hose and need to be placed inthe window.

How to Choose a Casement Window AC

1. Determine the window dimensions

All casement ACs are less than 15” wide. However, you need to take into account the crank window installation kit, which can add an extra inch to the total width.

Manufacturers typically provide a minimum window width in the specs sheet. The industry standard is 15 ½” minimum window width. Make sure the AC’s specified minimum window width and maximum window height falls within your casement window dimensions.

2. BTU sizing

The cooling capacity of all AC units are measured in BTU (British Thermal Unit). asement window ACs have a typical upper capacity of 8,000 to 10,000 BTUs owing to their narrower design. 

Use our BTU calculator to determine the required capacity for your particular room.

3. EER

EER stands for Energy-Efficiency Ratio, which is a measure of energy efficiency derived by dividing the BTU with the wattage. The higher the EER, the more energy-efficient the unit is.

4. Extra features

Consider additional features such as adjustable fan speeds, programmable timers, remote controls, and sleep modes for added convenience and comfort.

Recommended Casement Window AC Units for 2024

Frigidaire FHSC082WB1 8000 BTU Casement Window Room Air Conditioner – 115 Volt – R32 Refrigerant

This compact casement window AC has an 8,000 BTU cooling capacity and 10.8 EER, capable of servicing spaces up to 350 sq. ft. depending on ceiling height. Updated for 2023, this new model uses R32 refrigerant, which is more efficient, safer, less toxic and better for the environment.

It boasts electronic digital controls for ease of use as well as a full function remote control. Additional features include a 3 speed fan, sleep mode and auto restart in the event of a power failure. A convenient filter change indicator lets you know when it’s time to change the included washable filter.

Spacewise® adjustable side panels allow the unit to best fit your window A window installation kit is included.

Frigidaire FHSC102WB1 10000 BTU Casement Window Room Air Conditioner – 115 Volt – R32 Refrigerant

This casement window AC is capable of 10,000 BTUs and has a 10.4 EER. It is a great solution for rooms that are up to 450 sq. ft. depending on ceiling height. It uses the newer R32 refrigerant, making it future-proof for years to come. It also meets the requirements for use in California

Like its smaller cousin, it also comes with digital controls, a remote control unit, filter change indicator, 24 hour on/off timer, and 4-way air control.

A window installation kit is included. This unit plugs into a standard household outlet and includes a 6′ power cord.