How do I set my Totaline Programmable 5-2 Day Digital Thermostat so:
a) the air conditioning comes on when the temperature exceeds 90
b) the heat comes on when the temperature is below 65 degrees.
I might be wrong, but I haven't seen a digital thermostat that switches
between heat and cool mode automatically. You usually have to switch
them from heating mode into cooling mode (or vice-versa) manually.
I have this thermostat:
Doesn't this thermostat AUTOMATICALLY begin heating and cooling based
on the "set-points"?
No, it _stores_ a set of (possibly different) setpoints for each mode,
but the mode (heat/off/cool) is manually selected by the left of the two
control levers. But it won't switch modes automagically.
It will automatically begin heating *OR* cooling based on your set
Not heating AND cooling.
When the mode switch is in the HEAT mode, that's all it will do. Turn
the furnace on or off. It won't do anything with the AC. The converse
is true when its set to COOL mode.
If you want to switch automatically between heating and cooling, you're
going to fork over $150 or more for a different thermostat -> one that
has an AUTO mode in addition to HEAT/COOL/OFF.
Or you can get a cheaper $50 thermostat (that doesn't have AUTO mode)
and wire the A/C separately to that t-stat. The fan would also have to
be wired to that t-stat as well I'm thinking (disconnected completely
from the existing t-stat).
Then according to the manual, it has no "auto" mode where it will turn
on the AC or the furnace as desired.
You'll notice that it's an expensive thermostat ($140 - $200).
The problem with these is that your HEAT and COOL programs can conflict
with each other if you program it incorrectly. I don't know if the
"auto" setting has it's own program, of if it checks your HEAT and COOL
settings as you enter them to warn you of a conflict.
The solution is to buy another cheap thermostat and connect it to your
AC unit and set that thermostat to COOL, and program it the way you want
(turn on when temp goes above 90) and keep your furnace connected to the
existing thermostat and set it to HEAT mode and program it to turn on if
the temp goes below 65.
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