Technically, it is possible to use a split air conditioner and a window air conditioner in the same room, but it is not recommended. It would be inefficient and could lead to several issues.
Here are a few reasons why it is not advisable:
Temperature conflicts: Both air conditioners would be working simultaneously to cool the same space, which can create temperature imbalances. The two units might end up working against each other, leading to inefficient cooling and potentially uncomfortable conditions.
Energy consumption: Running two air conditioners simultaneously would significantly increase energy consumption, resulting in higher electricity bills. It is more efficient to use a single air conditioner that is appropriately sized for the room.
Installation and space requirements: Installing two separate air conditioning units in the same room would require additional space and resources. You would need to install separate outdoor units for the split air conditioner, which could be impractical, especially if the room has limited space.
Maintenance and servicing: Having two air conditioning units in the same room would require more frequent maintenance and servicing. This could be more time-consuming and costly in the long run.
It is generally recommended to choose a single air conditioning system that suits your needs and the size of the room. If you already have a window air conditioner installed, it would be best to use that as the primary cooling solution and consider removing or relocating it if you wish to install a split air conditioner.