Slinger rings have been on AC's for as long as I can remember and that's back to the mid 60's when I used to moonlight at an appliance repair shop. They'd run a spring special on window units, Gulf Coast where AC is an absolute necessity and lots of older houses without central. Come to your house, pull your unit, take it to the shop, clean and repaint as necessary, return the same day. Did a good business.
I have resolved myself to the fact that every 2 years the units will get pulled and cleaned. As a result, I have reduced the size of my units to get the weights down.
Now here's the kicker.
In one area of the house I have a current electronic controlled, not manual like not too many years ago, 15k BTU that is doing a better job of cooling than a 24k that I replaced for a lot less money to operate. In another area a 10k has replaced a 14k with the same results. I have a 2400 sq ft house and with power at about 11 cents a kWHr my power bill in the summer runs around $130-150 during July-August.
House is well insulated, lots of trees and by using window units rather than a central unit, the cycle cooling efficiency is much better and there is no loss to duct work in the attic which amounts to a lot. Don't believe me that attic losses are high, when your central unit kicks on, what comes out of your duct first? Hot air. Then by having numerous area serving units, if you aren't using an area of the house you don't have to pay to keep it cool. Just turn off the AC.
For me, there is absolutely no comparison between the performance of the new electronic and the older manual controlled units. I can give it to you scientifically if you want it as to why.
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