I don't know about most, but that is my experience with
mechanical thermostats and it makes for a miserable house.
OTOH, my Honeywell digital never varies more than 1 degree
when it is stabilized and running automatically. This
thermostat was a huge improvement from the mechanical one.
OTOH, if you manually boost the temp, it can take sometime
before the furnace comes on and the thermostat manual
indicate that is normal. If it doesn't come on immediately
I just boost the temperature up another 3 or so degrees and
as soon as it starts I move the temp down to where I wanted
it. Again, after it stabilizes (goes through one on cycle),
it won't vary by more than one degree.

Steve Stone wrote:

Don't most stats have a plus or minus 3 degrees or so in latitude in when
they turn off or on ?

--

Remove "zz" from e-mail address to direct reply.

"barry martin" wrote in message
news:1609755909.6110.77.2326292.1433022511.RIMEGat ...
J J:

JJ we have a honeywell programmable thermostat for a water-based heating
JJ system.
snip
JJ what on earth could possibly make this thermostat turn the heating on
when
JJ it's set at 71 and the temp reads 73?

It's going to become pretty obvious I don't know a thing about water-
based heating systems but I'll say it anyway. Any possibility it's
the wrong type of thermostat or it's set to 'cool' instead of 'heat'?

-
¯ barry.martinþATþthesafebbs.zeppole.com ®

* All must be held accountable, but don't quote me on that.
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