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2. Ground-coupled heat exchanger - Wikipedia

   en.wikipedia.org/wiki/Ground-coupled_heat_exchanger

   Closed loop system: Air from inside the home or structure is blown through a U-shaped loop of typically 30 to 150 m (98 to 492 ft) of tube(s) where it is moderated to near earth temperature before returning to be distributed via ductwork throughout the home or structure.

3. Blowing agent - Wikipedia

   en.wikipedia.org/wiki/Blowing_agent

   The cellular structure in a matrix reduces density, increasing thermal and acoustic insulation, while increasing relative stiffness of the original polymer. Blowing agents (also known as 'pneumatogens') or related mechanisms to create holes in a matrix producing cellular materials, have been classified as follows:

4. Cellulose insulation - Wikipedia

   en.wikipedia.org/wiki/Cellulose_insulation

   While in 1976 there were roughly 100 cellulose insulation firms with 125 plants in the US, by 1978 there were more than 350 firms with more than 500 plants 1. Cellulose insulation was produced locally by small manufacturers who purchased ready-to-operate machines and offered a cheap and easy low-tech production process.

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

6. AOL - Finance News & Latest Business Headlines - AOL.com

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   Get breaking Finance news and the latest business articles from AOL. From stock market news to jobs and real estate, it can all be found here.

7. Knob-and-tube wiring - Wikipedia

   en.wikipedia.org/wiki/Knob-and-tube_wiring

   Its cloth and rubber insulation can dry out and turn brittle. [10] It may also be damaged by rodents and careless activities such as hanging objects from wiring running in accessible areas like basements or attics. Currently, the United States National Electrical Code forbids the use of loose, blown-in, or expanding foam insulation over K&T ...