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Germicidal irradiation via UV light on HVAC is just not possible. Due to the amount of energy it requires to be effective is ridiculously high.

https://www.climask.com.tr is interesting. Like a face mask on AC unit. Nano-silver is effective against bacterias and viruses. And having a filter with nano-silver coated surface is just a simple yet an effective approach. Cost-wise changing a good quality air filter every 2-3 months is much cheaper than having a UVGI installed and paying higher electricity bill every month.