View Full Version : Stat Settings
12-28-2005, 08:20 AM
New t'stat manuals recommend a 10 degree drop from day to night settings [68 to 58] for maximum economy. Old school advice was never to vary settings by more than a 3-4 degree drop.
ps - Thanks to all that provided advice on my no-heat posting.
12-28-2005, 08:26 AM
I have mine set at 68 occupied and 64 unoccupied and at night.
12-28-2005, 09:07 AM
I like 68/62
12-28-2005, 10:07 PM
12-28-2005, 10:15 PM
A 10deg. diferential is best for maximum savings.
Whats best for you is what your comfortable with.
12-28-2005, 10:20 PM
heat pump or fossil fuel?
12-28-2005, 11:11 PM
68 home, 60 day, 55 night.
It depends on how your is set up, and your comfrotable with it.
12-29-2005, 07:25 AM
All depends on how you are set up and the temps you have out side and the duration of the set back. If you use more energy to bring the place back in line then you basically did nothing but spend money.
12-29-2005, 08:43 AM
The Energystar.com website suggests that a 5*F setback saves 5%-12%...a 10*f setback saves 9%-18%. Their disclaimer is that this is subject to climate conditions and occupant comfort.
The Naturalhandyman.com website states:
"A common misconception associated with thermostats is that a furnace works harder than normal to warm the space back to a comfortable temperature after the thermostat has been set back, resulting in little or no savings....The fuel required to reheat a building to a comfortable temperature is roughly equal to the fuel saved as the building drops to the lower temperature. You save fuel between the time that the temperature stabilizes at the lower level and the next time heat is needed. So, the longer your house remains at the lower temperature, the more energy you save.
Another misconception is that the higher you raise a thermostat, the more heat the furnace will put out, or that the house will warm up faster if the thermostat is raised higher. Furnaces put out the same amount of heat no matter how high the thermostat is set--the variable is how long it must stay on to reach the set temperature....By turning your thermostat back 10ø to 15ø for 8 hours, you can save about 5% to 15% a year on your heating bill--a savings of as much as 1% for each degree if the setback period is eight hours long. The percentage of savings from setback is greater for buildings in milder climates than for those in more severe climates."
12-29-2005, 09:28 AM
Just as a slab with radiant needs to warm up to a balanced temperature before the heat locates a direction. The walls also need to hold or maintain that heat as long as possible or the heat will run to the cold and join the dark side (as my kids like to say)Some factors are insulation and materials even a tile floor dropped 10 -15 degrees will keep sucking the heat until it meets its mach. I do not totally disagree with the Handy man but they are not the HVAC rocket scientists that we are. Yes under the right circumstances money can be saved, but under the wrong money will be lost. Tell the person with radiant to set back the slab 15 degrees and they can wait till the next day before walking on it bare foot. They are putting out degrees with out any idea of what it will affect and little knowledge of how things work.
I realize down stairs I can set back 3 degrees at night and I will come back up with the circulator zones open and just one long run time. But if I go back 7 or more it will need to cycle about an hour or two to maintain a long off status. Up stairs I can do as I please it comes right back up. Location of piping also makes a difference. Just something to think about?
12-29-2005, 09:45 AM
with the current programmable t-stats, one can bring the temp back up in steps from a considerable, say 10F, in the morning so as not to drastically disturbe the sleep pattern just before awakening --
then just jump it before returning from work
you will be happier with one which allows several setting all 7 days --
again, just do it!
do you track your fuel costs as btu/DD/sf? winter & summer? after subtracting the "base" amount, say that of May or Oct for cooking, hot water?
12-29-2005, 01:49 PM
I appreciate the responses.
In reply to cem-bsee, I've always monitored oil deliveries, and, from the day I installed the programmable thermostats [earlier this month], Ive been monitoring boiler run time per the thermostats as well as degree days from the National Weather Service. My goal is to try to correlate the two and tweak thermostat settings to economize without compromising comfort.
12-29-2005, 01:56 PM
Thats a good thing to do pass the results
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