Carrier Infinity a/c UV light and dehumidifier questions
I'm puzzled. I have a 2 year old Carrier Infinity system in south Florida, and have a two part question. The system was installed with an optional single UV light add-on; the light just went out after two years, which I understand is normal. A new light is about $235, and only lasts the two years. The service tech said the single light system is inadequate, anyway, and would eventually cause the coil to collect so much gunk that it would need to be removed and cleaned to the tune of about $650; he was suggesting an upgrade to a $1075 two bulb UV system, guaranteed for 10 years, but still requiring a $200 bulb replacement every two years. First question: any thoughts on the UV system? Is it really necessary? My other, older, ordinary a/c systems in other homes didn't have UV lights, and there were never any coil issues. I've checked with Carrier and the 10 year warranty on the Infinity is not dependent on the UV system at all. Next question related to the dehumidifier: I've set the dehumidifier in the thermostat setting to the maximum 65%, yet the reading on the thermostat says 44-45%. I've also gone into the advanced settings and turned the dehumidifier to OFF, and the humidity reading went up to 51%. So ..the question is this: does turning off the dehumidifier run the risk of corroding or collecting mold/stuff on the coil? Can anyone help me understand the connection with the UV light - is it really necessary - and the coil - will it really corrode if I don't replace the UV light or upgrade to the two light UV system? Otherwise, I think the system is performing quite well. Any information will be helpful. Thanks!