geezer466 wrote:
Turn your thermostats down to about 18/19degrees C...
The amounts you save will be astounding.
There is a huge difference between keeping a room at slightly lower temperature rather than sub tropical....
Geezer, that is a suggestion that has become pure political propaganda. In fact it is an almost meaningless statement. And for the aged it can be a recommendation that greatly increases the risk of death.
Whenever this statement is made it never takes into account WHERE the thermostat is sited. It NEVER acknowledges that any artificially heated space such as a room has a temperature gradient, mainly between floor and ceiling. The statement NEVER appreciates that the temperature gradient between floor and ceiling becomes steeper as the external temperatures fall. And it NEVER takes into account any resident inaccuracy in the thermostat - the dial may indicate 21 degrees but there will be a tolerance on that indication; there will also be the inevitable hysteresis (the backlash between the ON and OFF states) the hysteresis can be a degree or more.
When the external ambient temperature is 'normal' say about 21 degrees C, then there is virtually no temperature gradient in the room between floor and ceiling. In this situation the temperature on the floor will be virtually the same as at the ceiling. With an external temperature of 0 degrees C and the wall thermostat set at 21 degrees, it is very likely that in an artificially heated room the temperature at the ceiling will almost certainly be very much higher than 21 degrees; whilst the floor temperature could very well be as low as 12 to 15 degrees C, and very much depending on the external temperature and the heat losses throughout the room.
Old people tend to spend a lot of their time sitting in low chairs, near to the cold floor where the temperature is nowhere close to minimum 21 degrees recommended by Age Concern and others involved with the elderly. The elderly are far more sensitive to low temperatures than are fit younger adults who are mainly making the suggestion to reduce the thermostat setting. Most thermostats are about 1.5 metres above the floor, significantly higher above the cold floor than the average old person's chair.
The only place I am aware that a temperature gradient is recognised by a domestic appliance producer is in cooking ovens. And to overcome this problem many ovens are now fitted with a fan to stir up the heat within the oven to equalise the oven temperature from top to bottom. But even in this example, I have never seen it spelled out that the original problem is one of an unwanted temperature gradient.