Curious what HVAC fan do you have that pulls in outside air?

Residential air conditioning systems are usually 100% recirculating
https://www.quora.com/When-using-just-the-fan-of-an-air-conditioning-system-is-it-the-outside-air-that-is-flowing-or-it-is-just-the-inside-air-that-is-just-turning-round

所有跟帖： 

• 不懂， 熱天FAN ON的確氣溫更高； 晚上FAN ON的確空氣新鮮一些 -deepsigh- ♂ (0 bytes) () 07/04/2023 postreply 07:08:44

• 溫差大感覺而已 -外鄉人- ♂ (0 bytes) () 07/04/2023 postreply 07:31:01

• 是的 室內循環而已，但是門窗都有縫 -MayX- ♀ (0 bytes) () 07/04/2023 postreply 07:43:43