我的爐子和空調應該使用哪種空氣過濾器？

Hopefully, you know that you should change you furnace and A/C filter every couple of months. But what kind of air filter should you buy? 希望您知道，您應該每隔幾個月更換爐子和空調過濾器。 但是，您應該購買哪種空氣過濾器？ If your HVAC system

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