I set the thermostat timer for a minimum overnight temperature of 45
degrees, to heat to 70 at 6:30 AM. Effectively, this leaves the furnace
turned off overnight. I figure that saves wear on the furnace / fan and
saves fuel costs overnight.
However, I heard on a radio program that thermostat timers should
only have a max differential of about 8 or 10 degrees.
Anybody know what the best settings are?
You wont overheat anything, but there is comfort and air circulation to
consider. Yes you will save a bit more but remember you are just heating
it back to the temp you need, btus lost btus added. Opinions vary , I
set back where it realises a 4 hr drop and for comfort and zone unused
areas for less heat. Add insulation for real savings.
Frozen pipes yes Bob , very bloody likely, when it is - 20f we open our
cabinets under the sink and some people even leave a drip. At -20f ive
seen mains freeze and pipes in enclosed cabinets freeze because of no
air circulation. Even at zero f. precautions must be taken. At - 20 he
will wake up to a 45 f house if it doesnt have great insulation, and
outside walls will be alot colder.
You are too saving something. The larger the temp difference between
inside and outside, the more heat moves. You'd probably save more by
turning that fan off when not in use, that could be adding $10 a month
to your electric bill.
The temp stays more constant thru out the house with the fan on 24-7,
especially in the winter, its been on for a year. The fan on my furnace is a
variable speed so its running at a very low speed when the heat or a/c is
not in operation.
Heat is constantly seeking cold to achieve equilibrium. The house is warmer
than the outside, so heat is traveling out of the building. You add heat as
needed by burning fuel.
Stored heat (sensible heat) is heat that has been absorbed over time. If you
allow the air temperature to go too low, the stored heat from the
furnishings, fixtures, etc, is also given off. The time to restore it all
is making the heater work longer overall than a 10 degree setback.
Ask you provide the sites then.
We turn the heat pump OFF at 5:00 every day.
It might cycle for a loooong time once its turned back on at 7:am the next
morning, but its sole task is to bring heat into the building, and
irrevelant is the amount of heat the structure is able to store, or that it
loses during the period the heat source is shut off.
If you have a heat pump, 8-10 is likely to produce the best savings in
most areas. A larger setback can cause more time in supplemental heat mode
where it is less efficient.
For resistance heat, every degree of additional setback will save money,
but too much could cause damage to pipes and furniture. With the addition
of a grand piano my nightly setback has been reduced.
For gas heat, like I have, you still can have some reduction in
efficiency, but for the most part the problem is the secondary effects. I
would stick to 15 or less.
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