Talk:Programmable thermostat

Needs discussion of the cancellation of the EnergyStar program and the reasons — Preceding unsigned comment added by 98.125.219.227 (talk) 23:42, 24 May 2011 (UTC)

Any of you engineers out there I am curious: What is the mean, mode, or median temperature to put a programmable thermostat on during the night in the winter? I know, I know it depends on where you live.Okay, I live in southwest Pennsylvania. My idea is that the lower I put the temperature at night the more I am wasting in the morning when the thermostat warms the house to optimum temperature. For example, I have the temperature set at 62 degrees at night and then 67 briefly in the morning when the household wakes up. The natural gas furnace continually runs during this time when the temperature outside goes below 40 degrees F. Should I reset it higher during the night on average? Does it matter? Am I wasting my time asking this question because the savings is nil? Thanks, P831

Calculating energy savings is simple. Take the delta T from indoor set point and setback point. The energy savings as a % are proportional to the difference. That is delta T for set point (daytime occupied temp) say 70 and outside temp of 40 your delta T for set point is 30 degrees. If your set back point (unoccupied or night temp) is say 60 and outside temp is 40 then setback delta T is 30. So your energy saving while in setback is 1 - (30/40). Work up a spread sheet for hour by hour. Typically if you are careful about setback when unoccupied and at night you'll save 15 to 30%. Programmable t-stats have a very poor user interfaces, but if used as proscribed you they do save energy. — Preceding unsigned comment added by 98.125.219.227 (talk) 23:57, 24 May 2011 (UTC)

Wikipedia is not a how-to manual
I've removed a good deal of information from this because it was an instruction manual and tips for people looking at getting a programmable thermostat. Such material is inappropriate on Wikipedia. It did seem to be fairly good advice though, I would recommend the author follow the advice on the page I linked to and post it on Wikihow or Wikibooks.--Nonpareility 19:15, 19 November 2006 (UTC)

Is 21 degrees supposed to be Celsius?
This article contains references to temparature settings that appear to be degrees Celsius (a room would not be very comfortable at 21F) even though digital programmable thermostats (especially for residences) are practically unheard of outside of the US. I would recommend changing the temps to degrees F and if necessary put the degrees C in paranthesis. 1:30 PM (that's 13:30 for you metric bastards) Pacific Time, Nov 18, 2008

The article might be rather US centric (furnaces, a cooling season, 24vAC circuits), but digital programmable thermostats are commonplace in Europe. — Preceding unsigned comment added by 86.136.60.199 (talk) 17:16, 20 November 2011 (UTC)

Digital thermostats with PID controller
The optimal start function of a programmable thermostat is a separate function to the PID controller. The PID controller, or more usually PI controller, controls the output of the thermostat dependent on the measured temperature error. Optimal start is a separate calculation to determine at what time to start a heating period based on previous measurement of the rate of temperature rise in the room where the thermostat is located. Mike Kirkham (talk) 22:07, 11 October 2011 (UTC)

Chronotherm/Chronothermostat
Please see discussion at Talk:Thermostat and contribute.  Captain n00dle \ Talk 13:01, 1 April 2012 (UTC)

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