Glenda Copeland wrote:
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?

I don't have that particular unit, but on mine, it looks like the is a nut
behind the metal thermo spring that could be turned a bit to calibrate it. What
you need is to turn it in the direction that makes the mercury switch less
level - just a little. If such an adjustment is not evident, bending the metal
where the switch attaches to the thermospring could do it.

The copper pointer at the bottom probably adjusts the difference between turn on
and turn off.