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<font face="Helvetica, Arial, sans-serif">A 5000 sq ft house for two
people that uses 20 000 kWh/</font>yr is very energy efficient,
but a 1000 sq ft house for those two people that uses 12 000 kWh/yr
uses less energy. It is hard to define efficiency for many
applications. I think an efficient house is one that requires
little energy to operate for its purpose (2 people in my case).
Others (like PassivHaus surprisingly) an efficient house is one that
uses less energy per square foot.<br>
<br>
<pre class="moz-signature" cols="0">Dr John Straube, P.Eng.
<a class="moz-txt-link-abbreviated" href="http://www.BuildingScience.com">www.BuildingScience.com</a></pre>
<br>
On 11-11-17 5:03 PM, Gennaro Brooks-Church - Eco Brooklyn wrote:
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cite="mid:CAPV9BxMRt1FSxaL0D7W=eU+nOuFTmQRQtAeJVj8joAnySrViUg@mail.gmail.com"
type="cite">
<pre wrap="">Reuben I think I get your point that some marketing is simply that.
And marketing may not be comparing apples with apples. But if you are
comparing use of BTU's over a period of time I don't see how the two
terms are not interchangeable, meaning a house that uses less energy
is more energy efficient and a house that is energy efficient uses
less energy.
Gennaro Brooks-Church
Director, Eco Brooklyn Inc.
Cell: 1 347 244 3016 USA
<a class="moz-txt-link-abbreviated" href="http://www.EcoBrooklyn.com">www.EcoBrooklyn.com</a>
22 2nd St; Brooklyn, NY 11231
On Thu, Nov 17, 2011 at 4:52 PM, Reuben Deumling <a class="moz-txt-link-rfc2396E" href="mailto:9watts@gmail.com"><9watts@gmail.com></a> wrote:
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<pre wrap="">Perhaps I should have said two more words about this.
A house that uses less energy than it used to; than it's competition across
town; than the energy code requires, etc. is, I think most of us would
agree, among other things, more energy efficient than those alternatives.
The reason this is so is that it uses less energy to keep its occupants
comfortable/clean/fed/etc. by whatever measure we may wish to use.
But the reverse is not necessarily true. A house that is asserted to be more
energy efficient may or may not use less energy. It may use more energy than
the categories to which we were comparing the first house above. It is
perhaps frustrating (it should be) to discover that the 'energy efficient'
house uses more energy than its builders/occupants/boosters/etc.
hoped/asserted/believed it would, but it is not uncommon. Nor is it really
all that surprising when we stop and consider how 'energy efficiency' is
packaged; how it is deployed; what it is bundled with.
Put another way, many dwellings asserted to be energy efficient use in some
cases considerably more energy per occupant, per square foot, and most
importantly per house than other dwellings that don't exhibit all the
'energy efficient' markers. I could give lots of examples.
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<pre wrap="">
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