Please be careful on high wind load, very cold days - I would suggest
that if you know that the next day is going to be that way you not do
I have had Geothermal for more than 20 years, in the early winter and in
the spring, set back saves a lot of money, but from about the middle of
December to the End of February here in Michigan, we do not do a
setback, since the secondary electric elements cost way more than the
I am looking at adding solar thermal heating the south wall of the house
next summer to further reduce the winter heating bill. I have 60 feet of
southern facing wall that is in direct sunlight almost all of the day.
That should give me a good thermal boost on even partly cloudy days.
Your offer good thoughts for the general geo situation, but
we do not have resistance auxiliary heat in either of our
two buildings. Our systems were designed for 20 year cold
All the best,
I'm wondering if your savings aren't as great as you think. The reason
is that on a setback day, you have zero electrical usage as the house
coasts down to the setback temp. The next day's usage gets nailed with
the recovery time usage. Perhaps week long vs day long alternating
periods might mitigate some of this effect?
So long as he reads the meter after his house i swarmed up,
it doesn't matter. But it should be well after it has warmed up
as lingering cold spots away from the thermostat will have the
effect you suggest. It would be better to read the meter at the
same time every night, right before the setback.
That's an effect if compares only one to the other. The point is,
however, that the time integral demand over the days w/ setback is lower
than without. Over a period of time when the average daily temp and
wind differences average out, the net will still be less with less
demand as a simple heat balance will show.
The better overall test would indeed, be to run for a longer period of
time at each operating mode and then compensate for the correlating
variables. Of course, the ideal test would be to hold the environment
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