I concur. That should definitely be done as part of the new-thermostat install job.
I most of the time checked them, unless it was a really easy one to get to… I also recommended my mechanics to check the new one before they installed it, it was their decision, but if they did not and it was defective, they did not get paid to redo it… Same thing with staters, check before install, very easy to check…
If you buy AZ junk or cheap T-stats then you tend to get more bad ones, if you go with known good ones, then you tend to get very few defective T-stats…
I always check them in a pan of water with a candy thermometer. I note the temp that it opens and also on the way down again. I’ve had one bad one in 50 years and my dad had a bad one who started me on the testing mode. But yeah rare these days.
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