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Questions tagged [energy-efficiency]

for questions about claims based on energy efficiency.

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26 votes
2 answers
1k views

Do setback thermostats cause more energy to be used, and does the heating type matter?

It was first brought to my attention by a local HVAC Contracting company, that a programmable/setback thermostat would actually cause my home heating system to use more energy, and hence for me to ...
cobaltduck's user avatar
9 votes
2 answers
3k views

How long does it take for renewable technology to recoup its energy cost?

There are a number of technologies which are aimed at producing energy from non-fossil sources, among which very popular are wind power and solar power technologies. However, I have encountered a ...
StasM's user avatar
  • 492
43 votes
1 answer
12k views

Does a human on a bicycle travel more efficiently than any other species?

Steve Jobs claimed on video that a bicycling human is more efficient at locomotion than any other species can manage. He repeated it separately on video, and in writing. The quote is still oft ...
Anko's user avatar
  • 2,011
18 votes
2 answers
1k views

Do "smart meters" bring about any significant savings?

UK television stations are showing multiple commercials such as this one which make claims about making significant savings if you get a smart meter (the linked ad claims fitting a smart meter would ...
GordonM's user avatar
  • 1,940
14 votes
1 answer
6k views

Are ion heaters significantly more efficient then normal electric heaters?

An ion heater manufacturer claims their ion heaters are a lot more efficient than common electric heaters: How ion boilers (heaters) STAFOR can reach COP 1,57? In solid conductors only half (...
Suma's user avatar
  • 6,126
11 votes
1 answer
1k views

Do calcified water heaters use more energy?

It is very often claimed (by both government energy efficiency experts and water-heater sellers/service people) that calcified heating elements in electrical water heaters lead to much higher energy ...
Matija Nalis's user avatar
10 votes
1 answer
2k views

Do candles emit ten times the carbon dioxide of an equivalent lightbulb?

In Wasteful Earth Hour?, it's claimed that candles emit roughly 10 times the carbon dioxide of light bulbs of the same brightness. While emissions will vary depending on the candle, the lightbulb and ...
Golden Cuy's user avatar
  • 39.1k
10 votes
1 answer
818 views

Can an on-the-fly water electrolyzer linked to the air intake improve fuel efficiency of a gasoline engine?

This article initially seems to investigate so-called water powered cars. The final few paragraphs of the article however branches off into discussion about a system where (as I understand it): A car'...
Highly Irregular's user avatar