Most after-market UV installations in HVAC systems are totally unnecessary and usually quite expensive. They have not proven to be especially effective against mold and most of us do not have mold anyway, just mildew or some such thing. I am told the UV lights have to be replaced annually at a cost of $150 or so plus the HVAC service call to replace them. Your best defense is what you are doing now - get multiple opinions and (most importantly) multiple estimates from licensed HVAC companies. I personally think they are a waste of money and have better used for my hard-earned money, but that is just my opinion.
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