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    3. Is it necessary to use a filter for air exchange in a room heated/cooled by a heat pump?
    Is it necessary to use a filter for air exchange in a room heated/cooled by a heat pump?

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    0  Views: 405 Answers: 1 Posted: 14 years ago
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      yes you may can live with the dust, but coils inside your unit can not
      14 years ago. Rating: 0
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