On Wed, 20 Feb 2008 02:27:24 GMT, "mr. spam" wrote:

ok this thing is vintage 1966

It must be horribly inefficient. Run of the mill new ones are 80%. I've
just learned that the Carrier Infinity with the outside air duct runs at
96.6%. Efficiency can be measured with a sniffing device that measures the
outtake air. I think it's time for you to upgrade.

Don www.donwiss.com (e-mail link at home page bottom).