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see photo notes for more. all temps in Fahrenheit.
All of this done in the name of science and not having a $2000 duke energy bill for the first three months like last year!
Graphed with Zabbix, Recorded with Digitemp, Measured on Dallas DS18B20 sensors connected to a DS9097U 1-wire to RS-232 serial bridge.
This is the full graph from my HVAC system log for April 2-7. This shows the temperature extremes that caused last night's storms and tornado warnings. As you can see the temperature dropped from about 81 degrees to about 58 degrees. That is a 20 degree drop. This isn't unheard of but its kind of interesting now that I have a system that will keep track of that.