Each of Co-op City's apartments is heated and cooled by devices called convectors. These are a sort of variation on a PTAC (Packaged Terminal Air Conditioner) such as one would see in most hotel rooms. Each apartment has several convectors and contains coils for heating and cooling. Over time, the coils become impacted with dust and dirt which lowers their thermal efficiency leading to tenant complaints. If conventional coil cleaning methods such as compressed air washing, pressure washing or using pump sprayers and hoses were employed, it would be necessary to remove coils and take them to a wash station to be cleaned.

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