My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on._thankyoucomeagain_ t1_iybcyuz wrote
Reply to comment by slade797 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
Seen very few digital but the do exist. I just repair them. What do I know.
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