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Some builders create pan joists by attaching a solid sheet good to the bottom of a floor joist to create a return air pathway

Some builders create pan joists by attaching a solid sheet good to the bottom of a floor joist to create a return air pathway
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Sources of heat gain in a house include solar gains, infiltration, conduction through walls and roof, occupants, and internal equipment

Sources of heat gain in a house include solar gains, infiltration, conduction through walls and roof, occupants, and internal equipment
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Sources of heat gain in a house include solar gains, infiltration, conduction through walls and roof, occupants, and internal equipment

Sources of heat gain in a house include solar gains, infiltration, conduction through walls and roof, occupants, and internal equipment
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Specially designed roof trusses come with a two-foot by two-foot notch cut next to the center post providing space to install an insulated duct chase inside the home’s conditioned space but above the normal ceiling height.

Specially designed roof trusses come with a two-foot by two-foot notch cut next to the center post providing space to install an insulated duct chase inside the home’s conditioned space but above the normal ceiling height.
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Split-system air source heat pump

Split-system air source heat pump
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Spray foam air seals gaps around holes and drywall-to-top plate seams.

Spray foam air seals gaps around holes and drywall-to-top plate seams.
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Spray foam air seals the boot to the ceiling

Spray foam air seals the boot to the ceiling
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Spray foam insulation used for raised ceiling duct chase

Spray foam insulation used for raised ceiling duct chase
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Spray foam insulation used for raised ceiling duct chase.

Spray foam insulation used for raised ceiling duct chase.
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Standard 2 in. by 4 in. stud secures duct chase - made of rigid insulation in this example

Standard 2 in. by 4 in. stud secures duct chase - made of rigid insulation in this example
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Straps are spaced too far apart causing the straps to compress the duct under its own weight

Straps are spaced too far apart causing the straps to compress the duct under its own weight
Video:

Support at Intervals for Flex Ducts (1)

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Tape over the seam connecting the flex duct to the trunk duct; in this case two 3-inch-wide pieces of tape were put together then laid over the seam.

Tape over the seam connecting the flex duct to the trunk duct; in this case two 3-inch-wide pieces of tape were put together then laid over the seam.
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Tape the flex duct core to the take-off collar using UL-181 foil mastic tape.

Tape the flex duct core to the take-off collar using UL-181 foil mastic tape.
Case Study:

Technology Solutions Case Study: Advanced Controls Improve Performance of Combination Space and Water Heating Systems, Minneapolis, Minnesota

Case Study:

Technology Solutions Case Study: Advanced Controls Improve Performance of Combination Space- and Water-Heating Systems

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Technology Solutions Case Study: Buried and Encapsulated Ducts, Jacksonville, Florida

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Technology Solutions Case Study: Combustion Safety Simplified Test Protocol

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Technology Solutions Case Study: Duct Sealing Using Injected Spray Sealant

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Technology Solutions Case Study: Field Performance of Inverter-Driven Heat Pumps in Cold Climates

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Technology Solutions Case Study: High-Performance Ducts in Hot-Dry Climates

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Technology Solutions Case Study: Hydronic Systems: Designing for Setback Operation

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Technology Solutions Case Study: Long-Term Monitoring of Mini-Split Ductless Heat Pumps in the Northeast, Devens and Easthampton, Massachusetts

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Technology Solutions Case Study: Low-Load Space-Conditioning Needs Assessment