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I had something similar happen with a remodel a few years ago. The electrician put the refrigerator on the upstairs lighting circuit. Every time the fridge or A/C kicked in all the lights upstairs dimmed. Once the fridge was on it's own circuit the problem went away.
Turn of breakers until you figure out which one the fridge is on, and then go through the house testing outlets and lights to see what else is on the same circuit.
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