Several people I know have had them installed for a reasonable cost and say they work well. Being in Florida mold is a big concern any advice, comments or help on this subject will be greatly appreciated. I am a former Commercial AC Tech from a by gone era 1970 so my knowledge is profoundly out of date.
Tom

 

different gases and pressures/temps, and lots more computer/microprossesor stuff.

UV light can't hurt. Actually help for allergy sufferers. The UV light kills bacteria and mold and such in the air stream.

Here's a good answer to you question and it has a link to some research done by Penn State.

http://www.construction.com/mold/AsktheExperts/ask_121505.asp

 

UV can not kill mold in the air stream unless you have MANY lights! Their is just to much ft per minute for the light to kill any thing. They can work if the shine on the coil but only one side so you have to get two to keep coil mold free. A good service contract is better in my mind than UV.

 

My advice would be first make sure your return air supply is tightly sealed.
Use a good filter purifying system.
I would recommend either Clean Effects filter system from Trane or my personal preference Bryant/Carrier Purifier.

UV lights are recommended to kill mold and other contaminates on your evaporator coil. Also some drain pan plastics may not be rated to handle UV light. They may break down over time.

I like UV lighting because it will kill everything on your evaporator coil but it is my last recommended add on to a system.

1 Sealed return then use pleated filter (minimum) merv 7
2 Recommend Trane Clean Effects or better Bryant/Carrier Purifier
3 Add UV lights to evaporator coil after either one or 2 is done first