The guy from SUNKOOL offered an alternative to the UV light and for the life of me I can’t remember what it was called??? I know it doesn’t need to be replaced often if at all. Whatever it is I hope it improves my memory.

My unit, which is inside my house, sits on a platform that has a giant return air vent in my hallway. Are there no vents like this in garages?

Don't believe it! its a scam my neighbor had the same thing being pulled on her a few week ago

No. There is a return air vent in the hallway ceiling and the air is ducted to the HVAC unit in the garage. But, there are no duct openings in the garage that would allow garage air to enter the unit. That would be a fire code violation.

AC Mold
 

Years ago my ac indoor unit was full of mold. I had the uv light installed and have had no problem since.

UV light
 

It"s another scam concocted by the greedy AC company. The UV light is useless. Believe me, I worked in the AC business for forty years. Save your money and go and treat yourself to a nice dinner instead.

Are they talking about mold within the ducts or on the unit itself?

The last time I had my AC serviced (it was the first time for me with this unIt), I accompanied the tech as he, took the front cover off and opened up the unit. He commented how clean it was, pointing out 2-3 pinpoint spots of mold. He told me he'd seen some that were completely covered with mold.

Anyway, he sprayed some sort of disinfectant on the unit. I've checked it since and I haven't seen any return of the mold...

The UV light is supposed to kill the mold within the unit, but it is not very effective, and it is a waste of money. Some people will claim that a UV light will treat the supply air and purify it as it passes through the unit, but that claim is also bogus.

I was an A/C tech for 40 years in Miami. 80% of the air handlers in Florida have some degree of mold in them.UV lights will KILL IT ALL only in the air handling unit. In a month it will look like a nuclear waste zone. Everything will be DEAD., But a UV light will not kill any of the mold spores in the air. For that you need an electronic air cleaner ( not to be confused with an electro static filter). Electronic air cleaners run about $1,500.00 installed. Great for people with breathing issues.

I've been researching for almost the same issue and am probably going with AdvantaClean. Phone: 407-973-6352.

Mold is caused by the entire system not being dried out by A/C not running long enough. A/c installers try to get you to move up to a bigger unit than you actually need sometimes causing the problem because it runs less time to cool the house. Best sizing is exactly what you need or slightly smaller. Install a setback thermostat if you don't have one. That way you have at least one long cycle when it changes from daytime to nighttime. I had a new internet capable thermostat installed which monitors humidity and kicks on A/C to dehumidify the house. We are snowbirds and can remotely check on temp and humidity and change settings if necessary.