On Mon, 16 Feb 2009 10:01:06 -0800 (PST), email@example.com wrote:
Frugal, not cheap, there's a difference. A good engineer keeps
material, energy, labor costs low, either for himself or the company
where he works. A fool and his money soon part.
Remember when touch-tone telephone was $1.50 extra per month? Well, I
make few calls per month and used rotary dial for 40 years...
$1.50 x 12 x 40 = $720
Approximating interest on 720 gives
$1360 saved for using rotary dial telephone. Not exactly a large
amount, but not musch missed with rotary dial. Today, I still have a
rotary dial phone, but touch tone is now "included free."
The drain line heat recovery device is what you need, like what's
Payback time in a retrofit situation is probably 100 years or
something, but it probably make sense from an environmental
sustainability point of view.
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