Duct Tape...

Have you ever wondered where duct tape got its name from? Source: Myths page off of consumer energy center.org (http://www.consumerenergycenter.org/myths/duct_tape.html). According to this page, duct tape was developed for military use during WWI. The silver kind was manufactured later when it became popular with HVAC contractors, who then used it to put together the ducts in air conditioning and heating systems they installed. While it may be suggested to use duct tape for fixes in your car or even your duct work - please remember that this is a very LIMITED and EXTREMELY short term fix. As such, in laboratory tests (testing different types to seal duct work) duct tape performed the WORST and ALWAYS failed. So if you recall duct tape in your duct work, it would be a good idea to finally get around to calling your HVAC contractor to see about getting that fixed...for good. Another thing is that if you are getting your unit replaced, certain "climate zones" in California require the ducts to be tested. If there is more than 15% leakage, then the ducts need to be replaced. In Covina, we are in climate zone 9 along with Pasadena, Glendora (etc.) while the coastal La County is in zone 6. You can find a link to find your zip code here. The duct testing law (as part of title 24) can be found here. It reads:

"2005 HVAC Change-Out Information

Why would you waste the energy savings from a new efficient air conditioner or furnace by connecting it to a leaky duct system? Properly sealed duct systems will lower your energy bills, increase your comfort and reduce pollution both inside and outside your home.

Beginning October 1, 2005, Title 24 of the Building Energy Efficiency Standards requires that ducts be tested for leaks when a central air conditioner or furnace is installed or replaced. Ducts that leak 15 percent or more must be repaired."

Be sure to check and see if your zip code is in the required testing area. This can be an additional cost as some HVAC companies do not do their own testing.