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Question DetailsAsked on 2/23/2018

I have a furnace but not AC. Do I need to replace the UV bulb ?

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1 Answer


Generally no - that is usually there to kill fungal growth on the A/C evaporator coil. Times when it WOULD be a good idea to keep it alive -

1) if you have high humidity in the house, so you are getting fungal/bacterial growth in the ducts

2) if you have a moldy basement or garage where the furnace is, so it is bringing in contaminated air which you will be breathing in after it comes through the ducts

3) sometimes if you have asthma or other respiratory diseases, a doctor will recommend UV treatment of the incoming airflow - though usually for that use you need a full bank of lights in the duct - usually a 3-4 bulb unit or usually better, two - 2-bulb units, to give enough UV exposure time to kill the bacteria and fungal spores as the air passes by them.

Note that if the A/C coil is still in there, even if the A/C unit is dead or even gone, that coil will still clog up with dust and lint and such eventually (time depending on how good a primary air filter you have in the system and how often you change it) and stArt blocking airflow through the system - so probably every few years or so it will need cleaning even if not in use.

Or for probably maybe maybe $100-200 range just have it removed by a Heating and A/C (your Search the List category to find well-rated and reviewed ones) tech. Unless you intend some day to get the old unit running (not likely if out of service for more than say a year or so), keeping the old coil serves no purpose - quite rare these days to find a unit which matches and can use an old coil, because A/C units and Heat Pumps have to be tested for energy efficiency as a unit - entire system WITH a specific coil designed for that unit, so pretty rare to be able to reuse a used coil with a new system. Plus that is commonly the first thing to go out (for $1000-1500 chzrge commonly), so does not make much sense to put an old coil on a new unit.

Answered 2 years ago by LCD

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