Why you should leave the door slightly ajar when using the air conditioner

By Phong Ngo   June 4, 2025 | 12:23 am PT
“I usually keep the doors shut when using the air conditioner, but I have recently seen conflicting advice online – some suggest leaving the door ajar or even installing a ventilation fan,” reader Thanh Dong wrote.

My family has air conditioners installed in two bedrooms, each about 20 square meters. We do not have AC on the ground floor because the space is not airtight. At bedtime, I always remind my wife and children to keep the bedroom doors tightly closed to avoid losing cool air and wasting electricity.

However, I have come across differing opinions on social media. Some say rooms should be sealed, while others suggest leaving them partially open to allow ventilation. I would appreciate advice from experienced readers or experts on what is actually best.

Advice from expert

 
 
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