Do bulb replacement programs save energy in heating climates?
My question is specifically about heating climates with a predominance of electric heat.
If a house is heated with 100% efficient electric heat, such as baseboard or panel radiators, does replacing incandescent bulbs with CFL or LED bulbs save electricity? Can anyone point to a study that has looked at this issue?
If a house is heated with <100% efficient electric heat (i.e. an electric furnace with ducts in the crawl space with the (perhaps) typical ~30% duct leakage, could bulb replacement actually be a step in the wrong direction? Of course, there are ~4-5 months of the year when heating use is minimal to zero, so waste heat from lighting is not useful during those months, but they are also the months with the longest daylight. And of course, waste heat from bulbs is often near the ceiling, where is may not be of much benefit. I’d like to know about any formal studies that apply to this, if there are any. Utility programs here in the Pacific Northwest all seem to operate bulb replacement programs (cost unknown but probably significant), so presumably there is demonstrated effectiveness.
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