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Right - A high-efficiency (95 AFUE) wall-hung gas-fired boiler heats water for the hydro-coil space heating system and also provides a back-up for the solar hot water system.

Right - A high-efficiency (95 AFUE) wall-hung gas-fired boiler heats water for the hydro-coil space heating system and also provides a back-up for the solar hot water system.
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Right - All seams in the HVAC equipment and ductwork are sealed with mastic; because the HVAC equipment is in the garage, it is an air-sealed closet.

Right - All seams in the HVAC equipment and ductwork are sealed with mastic; because the HVAC equipment is in the garage, it is an air-sealed closet.
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Right - An in-line air flow testing station is installed in a straight section of smooth metal duct (red outline) to determine the air flow rate of a fresh air intake for a whole house ventilation system.

Right - An in-line air flow testing station is installed in a straight section of smooth metal duct (red outline) to determine the air flow rate of a fresh air intake for a whole house ventilation system.
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Right - An ultra-efficient (COP 5.7) ground source heat pump provides hot water to an air coil in the central air handler which uses a variable-speed electrically commutated fan motor to distribute conditioned air to the home’s ducts.

Right - An ultra-efficient (COP 5.7) ground source heat pump provides hot water to an air coil in the central air handler which uses a variable-speed electrically commutated fan motor to distribute conditioned air to the home’s ducts.
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Right - Drywall was installed before installing the duct chase to ensure the ducts will be separated from the attic.

Right - Drywall was installed before installing the duct chase to ensure the ducts will be separated from the attic.
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Right - Duct runs are straight with gradual bends; joints are well sealed.

Right - Duct runs are straight with gradual bends; joints are well sealed.
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Right - Flex duct installed with adequate support and pulled taut to provide adequate air flow

Right - Flex duct installed with adequate support and pulled taut to provide adequate air flow
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Right - Flex duct installed with frequent supports, straight runs, and gradual turns to allow good air flow

Right - Flex duct installed with frequent supports, straight runs, and gradual turns to allow good air flow
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Right - Flex duct is used to connect the duct tester to the top of a duct riser where it meets the roof; connecting the duct tester to the largest part of the ductwork helps ensure uniform pressure distribution during a duct leakage test

Right - Flex duct is used to connect the duct tester to the top of a duct riser where it meets the roof; connecting the duct tester to the largest part of the ductwork helps ensure uniform pressure distribution during a duct leakage test
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Right - HVAC ducts should be well-supported with minimal bends and pinching.

Right - HVAC ducts should be well-supported with minimal bends and pinching.
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Right - Open-cell polyurethane spray foam to R-28 on underside of roof turns new attic into conditioned space for HVAC.

Right - Open-cell polyurethane spray foam to R-28 on underside of roof turns new attic into conditioned space for HVAC.
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Right - Seams in duct boot are sealed with mastic.

Right - Seams in duct boot are sealed with mastic.
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RIght - Seams in duct boot elbow are fully sealed with mastic.

RIght - Seams in duct boot elbow are fully sealed with mastic.
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Right - Straps are spaced close enough together to provide adequate support of the flex duct

Right - Straps are spaced close enough together to provide adequate support of the flex duct
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Right - The butterfly damper of this crawlspace supply register opens when the HVAC fan is running; the damper duct is sealed with mastic and supported by strapping.

Right - The butterfly damper of this crawlspace supply register opens when the HVAC fan is running; the damper duct is sealed with mastic and supported by strapping.
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Right - The duct shows redundant sealing including the caulk, tape, and flashing

Right - The duct shows redundant sealing including the caulk, tape, and flashing
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Right - The HVAC ducts are located between floors in conditioned space.

Right - The HVAC ducts are located between floors in conditioned space.
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Right - The HVAC ducts are located in conditioned space in a dropped hallway ceiling with very short duct runs for more efficient delivery.

Right - The HVAC ducts are located in conditioned space in a dropped hallway ceiling with very short duct runs for more efficient delivery.
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Right - The kitchen exhaust duct termination is integrated aesthetically and functionally with the exterior cladding; however, the opening should be screened to keep out pests.

Right - The kitchen exhaust duct termination is integrated aesthetically and functionally with the exterior cladding; however, the opening should be screened to keep out pests.
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Right - The open web floor joists have ample space for HVAC ducts

Right - The open web floor joists have ample space for HVAC ducts
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Right - The precast insulated concrete walls of the basement provide a conditioned space for the high-efficiency (18 SEER, 9.5 HSPF) air-source heat pump, with its variable-speed fan, five-stage compressor, and MERV 11 filter.

Right - The precast insulated concrete walls of the basement provide a conditioned space for the high-efficiency (18 SEER, 9.5 HSPF) air-source heat pump, with its variable-speed fan, five-stage compressor, and MERV 11 filter.
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Right - The rigid metal HVAC ducting is installed between the floor joists rather than in an unconditioned attic or crawl space to minimize heat loss.

Right - The rigid metal HVAC ducting is installed between the floor joists rather than in an unconditioned attic or crawl space to minimize heat loss.
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Right - the vapor barrier is extended up the sides of the piers in this crawlspace, which is sealed and insulated to house the HVAC ducts.

Right - the vapor barrier is extended up the sides of the piers in this crawlspace, which is sealed and insulated to house the HVAC ducts.
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Right - This duct penetration is properly flashed and integrated with the taped, foil-faced foam sheathing layer, which serves as the air and water barrier

Right - This duct penetration is properly flashed and integrated with the taped, foil-faced foam sheathing layer, which serves as the air and water barrier