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Question DetailsAsked on 6/29/2017

One company in florida is telling their customers they need to have oxygen coil scrubbers installed .Is this a scam

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1 Answer


Assuming you mean on the A/C evaporator coil:

Probably more than one - they are likely talking an ozone generator, which like black lights at the evaporator coil can reduce mold growth (and are commonly combined with a high-effeciency ro electrostatic filter to remove dust and lint before it gets to the coil to sell as a "complete" purification system).

They can help with the situation but personally I do not like or recommend them - they can cause deterioration of plastics and fabrics in the house, potentially cause lung and mucous membrane (eye, ear, nose, throat) long-term damage, and can corrode metal ducting.

My preference - a properly sized HEPA filter in the inlet of the furnace (filtering both incoming makeup air and return air) to remove the dust and mold spores and lint which provide mold/bacteria growth media on the condensor, adequate intensity (so commonly 2-3 bulbs each) blacly needed in high humidity areas), tweaking the fan operating cycle and airflow to ensure that the fan cycle is long enough after A/C shutdown to largely dry the coil after each operating cycle, and regular cleaning of the coil (meaning sometimes some one-time plenum modifications to make it readily accessible through access panels or with a pull-out coil so it is cheaper for future cleanings).

Putting in a high-efficiency HEPA filter sometimes requires some return/intake ducting mods to provide a large enough air handler box to hold the filter, because a truly high efficiency HEPA filter restricts the airflow to the furnace more than a standard efficiency one, so generally has to be 25-200% larger filter cross-sectional area than the "standard" filter without unduly restricting airflow through the unit.

What you need for your system depends on the exact system configuration, and of course on whether you are having problems now like excessive buildup of dust/lint on the coil and in the ducts, mold/bacteria growth on the coil or in the downstream ducts, rusting or condensation of water in the ducts, inadequate humidity removal from the air, short-cycling of the A/C, etc.

Answered 3 years ago by LCD

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