One final readout at the end of Sept. I really can get rid of the AC device !
Downstairs correlation by month. AC3 eventually correlates well with Ecobee cooling - 0.94946833
$`2019-04`
Down_Cool
AC NA
AC2 NA
AC3 NA
FurnaceUp NA
FurnaceDown NA
$`2019-05`
Down_Cool
FurnaceDown 0.96457804
AC 0.40228237
FurnaceUp 0.38490212
AC2 -0.02461567
AC3 NA
$`2019-06`
Down_Cool
FurnaceDown 0.9923947
FurnaceUp 0.6044697
AC 0.3183210
AC2 0.2872561
AC3 NA
$`2019-07`
Down_Cool
FurnaceDown 0.98573638
AC3 0.56490245
FurnaceUp 0.51124528
AC2 0.32950875
AC 0.06935545
$`2019-08`
Down_Cool
FurnaceDown 0.9939775
AC3 0.7953435
FurnaceUp 0.6062248
AC2 0.1969622
AC 0.1884249
$`2019-09`
Down_Cool
FurnaceDown 0.96806223
AC3 0.94946833
FurnaceUp 0.56990137
AC2 0.52039402
AC -0.01887556
Upstairs correlation by month. AC2 eventually correlates fairly well with Ecobee cooling - 0.8995683
$`2019-04`
Up_Cool
AC 0.9791817
FurnaceUp 0.9769824
FurnaceDown -0.1541840
AC2 NA
AC3 NA
$`2019-05`
Up_Cool
AC 0.99412114
FurnaceUp 0.97723727
FurnaceDown 0.14122794
AC2 -0.02226503
AC3 NA
$`2019-06`
Up_Cool
FurnaceUp 0.9892451
AC 0.6702095
FurnaceDown 0.5909811
AC2 0.1680601
AC3 NA
$`2019-07`
Up_Cool
FurnaceUp 0.9850562
AC3 0.5987115
FurnaceDown 0.5131142
AC2 0.3918143
AC 0.1948437
$`2019-08`
Up_Cool
FurnaceUp 0.9980361
FurnaceDown 0.6066122
AC3 0.5671459
AC2 0.4513146
AC 0.1011073
$`2019-09`
Up_Cool
FurnaceUp 0.9810785
AC2 0.8995683
FurnaceDown 0.5922095
AC3 0.5786095
AC 0.1425038