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Insulated vinyl siding or better windows ? - Page 3

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Posted by Neo on April 6, 2010, 1:03 am

I talked to a window salesman about upgrading my windows (8) and patio
doors(2) with
double pane, UV film, argon filled, insulated reinforced vinyl frame
windows manufactured by
Camelot Windows ( Model=Crusader, U factor =.27,  SHGF= .26,
Condensation resistance =61)
the estimated cost for the upgrade was $4000.  The townhouse is in
MD suburbs of Washington DC and the electricity cost about (with a
from Clean Current's Wind Turbine electricity) is 15 cents/kwh.

My rough estimate is that about  50 to 300 kwH/month between June and
August is used cool the townhouse and between 50 to 800 kwH/month
September and May is used to heat the townhouse. I believe that about
of my electrical usage in my all electric home is used for heating and
this amounts to about   4400 kwh/year.  My guess is  that the improved
and patio doors would increase the townhouse energy efficiency by 50%
the windows/patio doors would go from about a  U factor of .6 to .27.
my estimated energy saving would be approximatedl 2200 kwh/year
a savings of   $30 year.  However because the cost of the new windows
be $4000 - it would take 43 years to break even.  Even if energy
quadrupled to 60 cents/kwh -- with a savings of $320/year it would
11 years to reach the break even point. sigh.,...


Posted by vaughn on April 6, 2010, 1:19 am

Actually it would take much longer than 43 years because you failed to consider
cost of capital.  Also your projected energy savings seems so high that I wonder
if it is realistic.  On the other hand, it may increase the value of the unit,
but probably not by $4,000

There are considerations beyond simple energy payback.  We actualy paid much
more that $4,000 to replace the 40 year-old windows in our house, and I
condiser it money well spent.  Besides, the energy savings, the house is much
more comfortable, quieter, and even cleaner.  Since we live in hurricane
country, the (impact type) windows give us significant hurricane protection and
qualify us for an insurance discount.  That said, I never expect them to pay for



Posted by Guido on April 6, 2010, 10:23 am

vaughn wrote:



That depends on how you value comfort and sense of security, eh?
Like you said, "money well spent"! ;-)

Posted by Guido on April 6, 2010, 10:18 am

Neo wrote:

I wonder what you'd save if you put the $4,000 into PV cells on the
roof to generate your own electricity?

Posted by Josepi on April 6, 2010, 3:37 pm

It would cost you $4K at 5% interest (not invested or mortgage payments) =
700 per annum.

You panels may generate that much but not likely.

Neo wrote:

I wonder what you'd save if you put the $4,000 into PV cells on the
roof to generate your own electricity?

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