有网友问，多久需要清理heating system的dust. 关于这个问题，我请教了一下John, 是一个handyman. 以下是他的回答.
If someone has bad allergies, cleaning the system before you start every winter is a good idea. Although cleaning them never gets them 100% clean, it can help a bit. Dirt, dust and grime build up during the spring and summer from non use and it is helpful to do it once a year if you can.
It is really a personal choice but doing it every 2-3 years is good for sure.
Answer provided by John
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