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mine used to do the same thing, if both the front and rear AC units kicked on at the same time it wouldactually kill the clocks and we would have to reset them all! when we replaced the front unit, the new tstat had a cooling droop option that they enabled. this starts the compressor 30 seconds before starting the indoor fan. since then we rarely ever see any lights dim. the original tstat they installed did not have this option, so the unit caused the same problem with dimming/flickering. they changed the tstat out because it was not the one i was quoted, and they enabled the CD for some reason. i like it though, the unit seems to cool better since they did it.
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