Variable AC Setting
I have a 2 1/2 year old home with a split AC system. A 2 ton for upstairs and a 5 ton for downstairs Both are Carrier variable speed systems. The air handlers are in the attic and I live in SW Florida so it does get hot up there. I had my first routine maintenance check, about a year after installation, and the tech told me the system was wired incorrectly and the air handler was only operating at low speed. We debated about rewiring it to the intended setting but I declined as the AC always worked great and it was very quiet. I also monitor the humidity and it's always 40% or below. I've been happy with it ever since. Today I had a routine maintenance check up on the system and the new tech was quite adament about rewiring the system so it would operate at the higher speed. He kept saying air flow is your friend and operating at the lower speed could cause sweating of the ducts and subsequent damage although after 2 1/2 years there is no visible damage. So, I let him rewired the fan so it operates on high but I really don't like the noise of the high setting.
I'd like a few other opinions about potential problems by operating the system on low as I have since I moved into the home. I'd really like to go back to the low setting but don't want to damage the home and end up with costly repairs.