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This traditional centrally ducted heat pump heats and cools the entire home through a network of ducts.

This traditional centrally ducted heat pump heats and cools the entire home through a network of ducts.
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This typical dropped ceiling hallway chase shows a complicated air sealing scheme where chase ceiling drywall meets sidewall top plates

This typical dropped ceiling hallway chase shows a complicated air sealing scheme where chase ceiling drywall meets sidewall top plates
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This upflow air handler for a traditional heat pump has an electric resistance auxiliary heating element located at the top of the unit (circled in red).

This upflow air handler for a traditional heat pump has an electric resistance auxiliary heating element located at the top of the unit (circled in red).
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This utility room houses a high-efficiency gas boiler to provide hot water for the radiant floor heating system and faucets. It also has a central air source heat pump and an energy recovery ventilator.

This utility room houses a high-efficiency gas boiler to provide hot water for the radiant floor heating system and faucets. It also has a central air source heat pump and an energy recovery ventilator.
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This wall-hung ductless indoor mini-split heat pump contains a fan, filter, and heating/cooling coil just like a traditional central air handler for a ducted heat pump system

This wall-hung ductless indoor mini-split heat pump contains a fan, filter, and heating/cooling coil just like a traditional central air handler for a ducted heat pump system
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This wall-mounted evaporative cooler is easy to access for maintenance

This wall-mounted evaporative cooler is easy to access for maintenance
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This window is properly flashed, with pan flashing, then side (jamb) flashing over the window flanges, flashing across the top, and then the house wrap flap folded down before head flashing is added.

This window is properly flashed, with pan flashing, then side (jamb) flashing over the window flanges, flashing across the top, and then the house wrap flap folded down before head flashing is added.
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Threshold Sweep Flashing protects the door and helps to keep out wind-driven rain.

Threshold Sweep Flashing protects the door and helps to keep out wind-driven rain.
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To attach the flex duct to a main trunk duct or any other connection, the flex duct is pulled over the connecting collar at least 2 inches past the raised bead, then the insulation is pulled back

To attach the flex duct to a main trunk duct or any other connection, the flex duct is pulled over the connecting collar at least 2 inches past the raised bead, then the insulation is pulled back
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To increase surface area and reduce pressure drop for high MERV filters, the return duct can be constructed to permit the installation of two furnace filters side by side

To increase surface area and reduce pressure drop for high MERV filters, the return duct can be constructed to permit the installation of two furnace filters side by side
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To perform a duct leakage to outside test, the home must be pressurized using a blower door while the duct test is carried out at the same pressure.

To perform a duct leakage to outside test, the home must be pressurized using a blower door while the duct test is carried out at the same pressure.
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To prepare for a total duct test at final, cover all of the supply outlets and return inlets

To prepare for a total duct test at final, cover all of the supply outlets and return inlets
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To prepare for a total duct test at rough-in, cover all of the supply outlets and return inlets

To prepare for a total duct test at rough-in, cover all of the supply outlets and return inlets
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Total Rater-measured duct leakage ≤ 8 CFM25 per 100 sq. ft. of conditioned area

Total Rater-measured duct leakage ≤ 8 CFM25 per 100 sq. ft. of conditioned area
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Transfer grill sealed with mastic

Transfer grill sealed with mastic
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Transfer grille not sealed

Transfer grille not sealed
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Transfer grills and jump ducts provide pathways for air to reach the centrally located HVAC return grille, even when bedroom doors are shut.

Transfer grills and jump ducts provide pathways for air to reach the centrally located HVAC return grille, even when bedroom doors are shut.
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Transom returns are installed over interior doors to provide a pathway for return air

Transom returns are installed over interior doors to provide a pathway for return air
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Trunk to duct connections are only mechanically fastened and not sealed

Trunk to duct connections are only mechanically fastened and not sealed
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Trunk to duct connections are properly insulated and have been sealed with mastic

Trunk to duct connections are properly insulated and have been sealed with mastic
CAD File:

Turned down concrete slab - 1 1/2 inch rigid insulation

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Turned down concrete slab - 1 1/2 inch rigid insulation
CAD File:

Turned down concrete slab - 1 inch rigid insulation

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Turned down concrete slab - 1 inch rigid insulation
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Turned down concrete slab - 3/4 inch rigid insulation

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Turned down concrete slab - 3/4 inch rigid insulation
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Two L-brackets or seismic snubbers are installed at each corner of the HVAC unit and a vibration isolator or spring mount is installed in each corner to anchor the unit while allowing for slight movement in an earthquake

Two L-brackets or seismic snubbers are installed at each corner of the HVAC unit and a vibration isolator or spring mount is installed in each corner to anchor the unit while allowing for slight movement in an earthquake