"Glenda Copeland" wrote in
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How do I adjust a thermostat so that the heat reaches the set temperature?

My Honeywell round thermostat has a bulb with mercury in it and a coil of
metal that seems to control when it makes electrical contact.

When I set the Honeywell bulb thermostat to 68°F, the heat only gets to
about 58°F. Likewise, when I set the thermostat to 85°F, the heat shuts
off
when it reaches about 75°F.

This works fine except my husband keeps yelling at me for setting the
thermostat to 85°.

I know the simple answer is to change him but why do thermostats have
numbers on them if they're not even close to those numbers?

Is there a way to adjust the temperature? When I pull the round cover off,
I see a copper pointer on the bottom with etch marks on the plate below
but
that pointer is already all the way to the left and moving it to the right
just seems to make the offset error worse.

What's the procedure to adjust a Honewell round thermostat to reach the
set
point before turning off?


It's probably easier to just replace the mercury thermostat with a digital.
It'll be more accurate and have less temperature fluctuation. The little
pointy thing is supposed to be aiming at whatever current amount the device
it's controlling is drawing. It may be a relay or a zone valve, so you'd
have to know this, then find the thing, then find the label on it where it
give it's current draw. You could just point the thing far to one side, then
see how it affects the temperature, then far to the other side, and make
whatever adjustments you need. Keep in mind also, that Honeywell T-87 yo-yo
thermostats must be level as well. There are marks on it, that you hold a
plumb bob up to ,to properly level it.