thermostat setting in house

Old 12-09-05, 06:45 AM
ken eldridge
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Question thermostat setting in house

with a new super efficient W.M. hot water boiler, is it more energy efficient to keep the temp constant, or turn it down at night.
Old 12-09-05, 04:32 PM
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T-stat setting

I have multiple zones & keep them at different temperatures. The only one which gets turned up & down is the zone for the bedrooms. I use a programable stat for that but otherwise the heat stays at a constant temperature 24/7. With a single zone, you would probably want to keep a constant temperature as long as you are comfortable.
Old 12-10-05, 07:06 AM
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It makes no difference how efficient the heat source is. The reason for turning down the thermostat is to lower the temperature difference between inside and outside the house. The rate of heat loss is directly proportional to that temperature difference. In most cases, you will save money by turning down the thermostat. If you have a lot of thermal mass (a lot of masonry, stone, concrete, etc.) then the temperature will drop very slowly because of the heat stored in the thermal mass (such as radiant heat set in concrete or Gypcrete). The same would go for a tight and very well insulated house, or if the outside temperature is in the 40s or 50s. The rate of heat loss would be relatively slow. As an example, if it is 20F outside, an inside temperature of 65F loses heat to the outside at a rate that is 10% slower than at 70F, ((65-20)/(70-20)) or (45 divided by 50). Of course the longer the temperature is set back, the bigger the savings. If you set back the 5 degrees for only 8 hours a day, then you are only saving 1/3 of the 10% of your fuel bill.

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