In theory, it is possible to install a window air conditioner in a door, but it may not be the most practical or efficient solution. There are a few considerations to keep in mind:
Size and Fit: Window air conditioners are designed to fit into standard window openings. Most doors have a different size and shape compared to windows, so you would need to ensure that the air conditioner fits securely and seals properly in the door opening. This may require modifications to the door frame or the air conditioner itself.
Support and Stability: Window air conditioners are relatively heavy and require proper support to prevent them from falling out or becoming unstable. Doors are not typically designed to support the weight of an air conditioner, so you would need to reinforce the door frame to handle the additional weight.
Airflow and Efficiency: Window air conditioners are designed to vent hot air out of the back or sides, which is usually facilitated by the window sash. If you install the air conditioner in a door, you need to ensure that there is adequate ventilation for the hot air to escape. Otherwise, the efficiency of the air conditioner may be compromised, and it could lead to overheating or reduced cooling performance.
Aesthetics and Security: Installing an air conditioner in a door might not look aesthetically pleasing, and it could affect the door's functionality and security. The modified door may not seal properly, leading to drafts or energy loss, and it could also make the door more susceptible to break-ins.
Instead of trying to install a window air conditioner in a door, it is generally recommended to use air conditioners designed specifically for doors or opt for other cooling solutions, such as portable air conditioners or split-system air conditioners that can be mounted on walls or ceilings. These alternatives are better suited for non-window applications and will provide better performance and safety. If you are unsure about the best option for your specific situation, it's a good idea to consult with a professional HVAC technician or contractor.