My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on.BoringCrow3742 t1_iybvcl2 wrote
Reply to comment by leannerae in My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on. by Iain_MS
up and down? nah just needs to be 72 F all year all day. set it and forget it =D
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