I bought a flat of these (4x4) for $16, about a year ago.
They work OK, but the mortality rate has not been the greatest.
After some months, some have gone intermittent, they turn on, work for a half hour or so, go off for a minute and come back on, and repeat this cycle. I can't say what percentage do this exactly... maybe 20%.
-AC
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I'm not an HVAC technician. In fact, I'm barely even a hacker...
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