Yes, if I turned it down and left it there for a week or longer maybe.
But downturning for any period under a couple days and all the mass
you've spent heating once, now you have to re-heat over again. (my
system has several thousand feet of water tubing under both house
floor and garage slab zoned).
It might be different if you have forced air heat, but for water heat
(via radiators or radiant tube) every installer tells you "set it once
and forget it, the idea is to store heat".
I believe in your situation it will still save energy. The reason they
tell you to "set it and forget it" is for comfort. Due to the large
mass of your system it will have a much slower recovery time, but that
does not mean it will take more energy, it's just slower. Or you could
turn it down hours before leaving and have it turn on hours before
arriving home again. That should help with the comfort.
Then tell me exactly what that magic length of time is. Is is 3.2 hours,
12 hours, 23.5 hours, or some other time? I did build one new home
with zoned hot water heat and it was great heat but we still turned all
three thermostats down when we left to save energy and it definitely did.
Wrong answer! Check previous threads on this topic.
So by your reasoning if you turned down the heat to 50F & left it down
for a week....you wouldn't save any energy because you'd have "add
back all that heat"?
No surveys or studies needed to address this question. The Second Law of
Thermodynamics decrees that the speed and extent of all heat transfers in
the universe depends solely on the temperature differential between two
objects. The moment you turn down the thermostat you start saving money. The
longer you keep it down, the more money you save.
For further musings: http://www.rationality.net/entropy.htm
Looks like there is very little hope for you understanding the thermo
Walter made a very simple / concise statement of the value of setback
but you still choose to disbelieve it. :(
The energy saved is the amount of energy used to maintain the house
at the setback subtracted from the energy that would had been expended
to maintain the house at the higher temp.
outside temp 50F inside temp 70F (without setback)
outside temp 50F inside temp 60F (with setback)
house at setback temp loses ~1/2 the heat that the house at "normal"
now if we could just get people to not top post
The energy you buy is the same energy as what's lost. Cold
house loses less heat. The recovery swing is a lot less heat
than keeping the house warm.
* It may take a long time, which is unacceptable
* It may cause your heat pump to go into emergency heat,
which is more expensive
This is veering away from the original question a little, but -- This
time of year, and also in spring, we have days where it will be in the
40's in the morning and 80's in the afternoon. I know lot of people who
turn the heat up to 70 or more in the morning, then by early afternoon
they have the a/c on. If they would just leave it off and tolerate being
a couple of degrees cooler for an hour or so in the morning, the house
would warm up on its own and be comfortable for most of the day, and
just before it might get a degree or so too warm, the sun will go down
and it gets comfortable again. They will then have used ZERO energy
where the others have used both heat and a/c. No replies to
the question about wives turning the stat all the way up/down so the
heat/a/c runs faster. I doubt there are 1% who DON'T think that. My ex
certainly did, and it was a total waste of time trying to explain it to
her. Unfortunately, women don't have a monopoly on that kind of
thinking-- I know a lot of guys who think the same thing. Larry
Pressing the "Door Close" and desired floor simultaneously put the elevator
in "express mode"
Of course many computer games have "secret" buttons for the elevators. Some
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