More great stuff:
low and slow, can't do that putting the pedal to the floor...Go big to go low: Maximize the efficiency of your heat pumps, chillers, boilers and solar systems by getting the return temperatures down in heating and up in cooling
ditto...Firing a high efficiency boiler to high temperatures with a programmable thermostats does not change the fact that the boiler is behaving like a mid efficient appliance.
The skills of an indoor climate engineer in designing a system for effectiveness and energy efficiency should never be confused with picking HVAC equipment out of catalogue nor the contracting skills it takes to assemble components on site.http://www.healthyheating.com/Window...mperatures.htmMessage: To obtain the rated performance from a high efficiency boiler you have to operate it at a low return temperature which can be achieved with a weather compensator and a heating system that has been designed for low temperatures.Adding programmable setback thermostats can provide some additional conservation measures in some systems but more so in low mass air based or baseboard systems and less so in radiant floors, walls or ceilings.Make note that when programmable stats are not properly used due to their complexity they can actually increase energy consumption rather than reduce it and finally, if moisture is not controlled in the space, setting back the space temperature can cause condensation on cooler surfaces.
SO UNLESS YOU ARE GOING TO TEST AND MEASURE AS BT HAS, DON'T SIMPLY ASSUME SETBACK SAVES.