attic duct

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Dealing With Ductwork in an Unconditioned Attic

What’s a good solution for a 1960s brick ranch house that has the furnace and ductwork installed in the attic?

Posted on Jun 12 2017 by Scott Gibson

Ted has more than a few cobwebs in his attic. The unconditioned space also houses his HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. system.

The 1,800-square-foot brick ranch in Climate Zone 4 dates from the 1960s, but the previous owner installed both a furnace and ductwork in the attic just four years ago. Ted also has inherited a powered attic ventilator. Although both the attic floor and the ductwork are insulated, Ted recognizes the situation isn't ideal.


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Image Credits:

  1. Tedliu

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Buried Ducts Allowed in 2018 Energy Code

The keys are duct leakage, R-values, and the vapor barrier

Posted on Feb 15 2017 by Allison A. Bailes III, PhD
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Water vapor from the air condenses on air conditioning ducts in humid climates. It's as normal as poorly insulated bonus rooms making occupants uncomfortable or cigarettes causing lung cancer. Condensation on ducts is most common in crawl spaces and basements, where the air is more likely to have a higher dew point.


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Image Credits:

  1. Energy Vanguard
  2. D. Mallay, Home Energy Research Labs, Building America research report

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Creating a Conditioned Attic

Five questions to consider before insulating a sloped roof

Posted on Dec 31 2010 by Martin Holladay

UPDATED on August 13, 2017 with new concluding paragraphs

Millions of Americans live in states where residential HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. contractors routinely install ductwork in unconditioned attics. In many cases, these attics also contain a variety of appliances, including air handlers, furnaces, or water heaters.


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Image Credits:

  1. Fine Homebuilding

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