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After securing the inner coil, cover the draw band and the seam with a generous amount of mastic

After securing the inner coil, cover the draw band and the seam with a generous amount of mastic
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Air handler platforms used as return air plenums can draw air from vented attics and crawlspaces through other connected framing cavities

Air handler platforms used as return air plenums can draw air from vented attics and crawlspaces through other connected framing cavities
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Air seal a heat pump or air conditioner air handler cabinet at all seams, holes, and junctions

Air seal a heat pump or air conditioner air handler cabinet at all seams, holes, and junctions
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Air seal all holes and seams in the furnace cabinet with mastic, foil tape, or putty

Air seal all holes and seams in the furnace cabinet with mastic, foil tape, or putty
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Air seal and insulate flex ducts

Air seal and insulate flex ducts
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Air seal around all duct shafts and flues installed through ceilings, walls, or flooring to keep conditioned air from leaking into unconditioned space.

Air seal around all duct shafts and flues installed through ceilings, walls, or flooring to keep conditioned air from leaking into unconditioned space.
CAD File:

Air seal at chase walls - plan

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Air seal at chase walls - plan
CAD File:

Air seal at duct boot

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Air seal at duct boot
CAD File:

Air seal at duct soffit

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Air seal at duct soffit
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Air seal duct boot to ceiling by installing fiberglass mesh tape and mastic over seam

Air seal duct boot to ceiling by installing fiberglass mesh tape and mastic over seam
CAD File:

Air sealing at porch roof at 1/2 inch plywood exterior sheathing

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Air sealing at porch roof at 1/2 inch plywood exterior sheathing
CAD File:

Air sealing wall between a porch roof and attic with 1 inch of rigid insulation

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Air sealing wall between a porch roof and attic with 1 inch of rigid insulation
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All dampers should be completely open in a duct system being tested for air leakage; looking at the actuator from outside the duct is not a reliable way to know damper position, so the pressure downstream of the damper should be measured

All dampers should be completely open in a duct system being tested for air leakage; looking at the actuator from outside the duct is not a reliable way to know damper position, so the pressure downstream of the damper should be measured
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All dampers should be completely open in a duct system being tested for air leakage; this damper is only partially open and should be opened fully prior to testing

All dampers should be completely open in a duct system being tested for air leakage; this damper is only partially open and should be opened fully prior to testing
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All of the ductwork for the efficient (8.5 HSPF, 15 SEER) heat pump is mastic sealed and installed in conditioned space.

All of the ductwork for the efficient (8.5 HSPF, 15 SEER) heat pump is mastic sealed and installed in conditioned space.
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All other supply ducts and all return ducts in unconditioned space have insulation ≥ R-6

All other supply ducts and all return ducts in unconditioned space have insulation ≥ R-6
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An array of 13.4 kW of solar panels form a waterproof roof for this porch that allows 15% of sunlight to filter through while the dual-surface panels produce power from the top and from any sunlight reflected up onto their lower surface.

An array of 13.4 kW of solar panels form a waterproof roof for this porch that allows 15% of sunlight to filter through while the dual-surface panels produce power from the top and from any sunlight reflected up onto their lower surface.
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An energy recovery ventilator provides filtered fresh air to every room in the house.

An energy recovery ventilator provides filtered fresh air to every room in the house.
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An ENERGY STAR central exhaust ventilation test is performed on a rooftop ERV duct system by an ENERGY STAR MFNC rater

An ENERGY STAR central exhaust ventilation test is performed on a rooftop ERV duct system by an ENERGY STAR MFNC rater.
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An in-line airflow station installed in rigid duct provides a location to measure ventilation airflow

An in-line airflow station installed in rigid duct provides a location to measure ventilation airflow
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Apply a nylon tie on top of the tape.

Apply a nylon tie on top of the tape.
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Apply a robust amount of UL-181 fiber reinforced duct sealant mastic paste to cover well past the edges of the tape.

Apply a robust amount of UL-181 fiber reinforced duct sealant mastic paste to cover well past the edges of the tape.
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Apply a thick layer of UL-181 fiber reinforced duct sealant mastic paste spanning over the polyester film of the flex duct core, the tape, and nylon tie, to the take-off collar.

Apply a thick layer of UL-181 fiber reinforced duct sealant mastic paste spanning over the polyester film of the flex duct core, the tape, and nylon tie, to the take-off collar.
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Apply caulk to wall framing

Apply caulk to wall framing