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Spray foam is installed between new studs over the existing siding in this deep energy retrofit

Spray foam is installed between new studs over the existing siding in this deep energy retrofit
Video:

Spray Foam Upper Walls Adjoining Unconditioned Attics

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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 horizontal joint with minimum 3" wide tape placing tape offset high on the joint, adhearing to the upper sheet without wrinkles

Tape horizontal joint with minimum 3" wide tape placing tape offset high on the joint, adhearing to the upper sheet without wrinkles
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Tape the joint between the top insulation sheet and the Z-flashing with 2" wide tape to improve air tightness

Tape the joint between the top insulation sheet and the Z-flashing with 2" wide tape to improve air tightness
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Taped vertical joint of lower wall insulation

Taped vertical joint of lower wall insulation
Case Study:

Technology Solutions Case Study: Evaluation of Passive Vents in New-Construction Multifamily Buildings

Case Study:

Technology Solutions Case Study: Photovoltaic Systems with Module-Level Power Electronics

Case Study:

Technology Solutions Case Study: Stand-Off Furring in Deep Energy Retrofits

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Temporary deployment locations for probes used during HVAC commissioning; these probes connect to smartphone commissioning applications.

Temporary deployment locations for probes used during HVAC commissioning; these probes connect to smartphone commissioning applications.
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Terminate 4" tape with 2" wide tape placing tape offset high on the joint, 2/3 of the tape should be adhered to the sheet of insulation

Terminate 4" tape with 2" wide tape placing tape offset high on the joint, 2/3 of the tape should be adhered to the sheet of insulation
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The attic kneewall and the open floor cavities under kneewall are both sealed and insulated in one step with spray foam insulation

The attic kneewall and the open floor cavities under kneewall are both sealed and insulated in one step with spray foam insulation
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The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the return side of the air handler for conditioning, mixing, and distribution

The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the return side of the air handler for conditioning, mixing, and distribution
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The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the supply side of the central air handler for mixing and distribution

The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the supply side of the central air handler for mixing and distribution
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The dehumidifier draws air from both a common area in the house and from outside, dehumidifies it, and adds it to the supply side of the air handler for distribution

The dehumidifier draws air from both a common area in the house and from outside, dehumidifies it, and adds it to the supply side of the air handler for distribution
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The drywall above the dropped ceiling duct chase extends beyond adjoining top plates for a continuous air barrier

The drywall above the dropped ceiling duct chase extends beyond adjoining top plates for a continuous air barrier
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The furnace filter slot cover should fit tightly to minimize air leakage but it should not be taped or caulked to enable frequent filter replacements.

The furnace filter slot cover should fit tightly to minimize air leakage but it should not be taped or caulked to enable frequent filter replacements.
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The original corner seam is air-sealed with caulk, then rigid foam is installed on the existing garage ceiling and walls, and finally covered with drywall.

The original corner seam is air-sealed with caulk, then rigid foam is installed on the existing garage ceiling and walls, and finally covered with drywall.
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The PNNL Quality Install Tool simplifies and standardizes the documentation of HVAC installations and efficiency upgrades through photo-based prompts

The PNNL Quality Install Tool simplifies and standardizes the documentation of HVAC installations and efficiency upgrades through photo-based prompts
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There should be less than 2.5 inches per each five foot of duct length

There should be less than 2.5 inches per each five foot of duct length
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This air handling unit provides outside air at the same rate as the air being exhausted from the bathroom exhaust fan; local kitchen exhaust is provided by a range hood with a dedicated makeup air intake and dehumidification is provided by a separate unit

This air handling unit provides outside air at the same rate as the air being exhausted from the bathroom exhaust fan; local kitchen exhaust is provided by a range hood with a dedicated makeup air intake and dehumidification is provided by a separate unit
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This central heat pump water heating system with a hot water circulation loop that returns to the primary storage tank relies on a multi pass heat pump to provide both primary DHW heating and hot water circulation temperature maintenance

This central heat pump water heating system with a hot water circulation loop that returns to the primary storage tank relies on a multi pass heat pump to provide both primary DHW heating and hot water circulation temperature maintenance
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This central heat pump water heating system with a hot water circulation loop that returns to the primary storage tank relies on a single pass heat pump to provide both primary DHW heating and hot water circulation temperature maintenance

This central heat pump water heating system with a hot water circulation loop that returns to the primary storage tank relies on a single pass heat pump to provide both primary DHW heating and hot water circulation temperature maintenance