Is $1,785 to install a Patriot Carbon UV Air Treatment System a fair price?

I have recently noticed a smell in my HVAC unit (bottom floor in the washroom). I had a tech come out for the yearly maintenance, and he took the panel off and saw mold growth. I was then recommended a UV lamp to be installed to kill any mold spores and prevent future growth. I have been reading all around on them and see mixed opinions. Ultimately, I would like one, but have gotten a few different offers. I was hoping someone could advise on these three models and which one, if any is better.