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Is it cheaper to heat it or keep it warm? Eric in North TX 02-02-2007
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Posted by Eric in North TX on February 2, 2007, 11:43 am


I recently changed my set-back in the downstairs part of the house to
58, down from 66 degrees at night. Could the warm up to 71 at 7 am.
use more gas than keeping it 66 all night? I don't think it actually
ever gets down to 58, and the furnace doesn't run at all during the
night on this setting, and it used to run 3-4 times during the night
to maintain 66 degrees.


Posted by on February 2, 2007, 11:52 am


> I recently changed my set-back in the downstairs part of the house to
> 58, down from 66 degrees at night. Could the warm up to 71 at 7 am.
> use more gas than keeping it 66 all night? I don't think it actually
> ever gets down to 58, and the furnace doesn't run at all during the
> night on this setting, and it used to run 3-4 times during the night
> to maintain 66 degrees.

If you DAGS on this, you'll find many extensive discussions.
Distilled: unless you have a heat-pump (thus low recovery-rate, and
use of resistive-electric heat strips), you will reduce energy use
by setback. The physics and math are pretty simple.

Many regional utilities will provide local rule-of-thumb for pct-
savings
for a given setback amount.

HTH,
J


Posted by Jeff Wisnia on February 2, 2007, 11:58 am


Eric in North TX wrote:

> I recently changed my set-back in the downstairs part of the house to
> 58, down from 66 degrees at night. Could the warm up to 71 at 7 am.
> use more gas than keeping it 66 all night?

Nope.

I don't think it actually
> ever gets down to 58, and the furnace doesn't run at all during the
> night on this setting, and it used to run 3-4 times during the night
> to maintain 66 degrees.
>


The heat loss through the walls/windows/doors/roof of your house is
proportional to the difference in temperature between the inside and the
outside (and some wind effects too.) The greater that difference the
faster the BTUs flow out.

If you keep it warmer at night more BTUs will flow out.

The less BTUs you lose overnight the fewer lost ones you'll have to
replace the next day.

Capice?

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.


Posted by Goedjn on February 2, 2007, 12:21 pm


wrote:

>I recently changed my set-back in the downstairs part of the house to
>58, down from 66 degrees at night. Could the warm up to 71 at 7 am.
>use more gas than keeping it 66 all night? I don't think it actually
>ever gets down to 58, and the furnace doesn't run at all during the
>night on this setting, and it used to run 3-4 times during the night
>to maintain 66 degrees.

No. You will always save energy by lowering the thermostat.



Posted by MRS. CLEAN on February 2, 2007, 2:37 pm


> wrote:
>
> >I recently changed my set-back in the downstairs part of the house to
> >58, down from 66 degrees at night. Could the warm up to 71 at 7 am.
> >use more gas than keeping it 66 all night? I don't think it actually
> >ever gets down to 58, and the furnace doesn't run at all during the
> >night on this setting, and it used to run 3-4 times during the night
> >to maintain 66 degrees.
>
> No. You will always save energy by lowering the thermostat.

True.

My heating bill was $22 in January.

I keep the thermostat down.


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