定期检查并清洁空调系统和水箱，必要时更换防冻液。
Regular check and clean the air-con system and water tank, and renew the antifreeze fluid when necessary.
原有的窗户清洁阳台被改造成配有内置式空调的窗户盒子。
Existing window cleaners' balconies were converted into bay Windows equipped with built-in air conditioners.
不要依赖空调，排气系统或打开窗户来清洁空气。
Don't rely on an air conditioner, ventilation system or an open window to clear the air.
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