The HVAC in my home is 19 years old and running well but I'm starting to plan for it's replacement. I'd like to use the same contractor I do for my rental houses and they sell Goodman and Amana. As a first pass I'm comparing the 4 ton Goodman GSXC18 (18 seer, two stage) and the 4 ton Amana AVXC20 (20 seer, variable speed). A primary goal is a quiet condenser since it's located close to our screened porch. Does anyone have opinions or advice about which way to go? I only have experience with more primitive single stage units so I feel slightly better about two stage though variable sounds sexy.

I see many new offering from HVAC companies to do retrofit UV lights on AC systems as a way to combat the coronavirus. I also see a number of ads from local establishments like restaurants, hair salons etc... claiming that they have new "coronavirus killing UV systems in place to make sure their environment are sterile". I also see some reports saying that UV-C doesn't do much because it needs time to work and the air is moving through the AC too fast for it to have any real effect. Anyone knows for sure? I could use a Myth Buster eposide on this.