Should I install a fresh air system in a sealed, air-conditioned room?

The room is around 20 square meters, with no windows and only a single door. I use the air conditioner regularly and have always thought that a sealed space helps keep the cold air in and saves electricity.

My family of four has been living like this without major issues. Only my two young children, aged 2 and 5, occasionally catch mild colds.

However, I recently saw posts on social media suggesting that using air conditioning in a completely closed room may be bad for our health due to poor ventilation.

I do not feel comfortable leaving the door slightly open, so I looked into other options. I found that some people install fresh air supply systems or use air conditioners with built-in fresh air functions.

I would appreciate advice from experts or experienced readers on whether this is a solution worth pursuing.

Advice from expert