Since 2010 kept 80/60. But every year anything plastic became brittle. Combs, brushes, hair dryer, sunglasses. First 3 not a big deal, but sunglasses cost was big $$$.
In October put in a new system, mentioned the issues. Had us set at 78/60. Installer said cost is minimum, and should help with less brittle sunglasses.
So far cost is only a few dollars difference per month more than the last 10 years.
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Do not worry about things you can not change 
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