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The pipe insulation on this exterior refrigerant line is intact but significantly degraded from ultraviolet (UV) exposure.

The pipe insulation on this exterior refrigerant line is intact but significantly degraded from ultraviolet (UV) exposure.
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The pointed tip of this static pressure probe should point directly upstream into the oncoming airflow

The pointed tip of this static pressure probe should point directly upstream into the oncoming airflow
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The raised hood at the base of the vent stack on this water heater shows that it is an atmospheric vented gas water heater

The raised hood at the base of the vent stack on this water heater shows that it is an atmospheric vented gas water heater
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The seam between this duct register and the wood flooring is sealed with caulk to prevent air leakage into the house from the crawlspace below.

The seam between this duct register and the wood flooring is sealed with caulk to prevent air leakage into the house from the crawlspace below.
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The sides on this awning kit might restrict overly airflow to the outdoor compressor unit of this heat pump; a design with open sides is recommended.

The sides on this awning kit might restrict overly airflow to the outdoor compressor unit of this heat pump; a design with open sides is recommended.
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The single strap cannot support the bend and is nearly severing the flex duct

The single strap cannot support the bend and is nearly severing the flex duct
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The tape is covered with mastic to ensure an airtight seal between the duct and the fitting

The tape is covered with mastic to ensure an airtight seal between the duct and the fitting
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The trash chute and trash room in a multistory multifamily building are depressurized with exhaust fans to minimize odors.

The trash chute and trash room in a multistory multifamily building are depressurized with exhaust fans to minimize odors.
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The ultra-efficient air-to-water heat pump draws heat from the outside air to heat inside room air in winter and domestic hot water year-round.

The ultra-efficient air-to-water heat pump draws heat from the outside air to heat inside room air in winter and domestic hot water year-round.
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The ultra-efficient ground source heat pump (COP 4.4) delivers conditioned air throughout the home via ducts; an ERV provides fresh air to the system.

The ultra-efficient ground source heat pump (COP 4.4) delivers conditioned air throughout the home via ducts; an ERV provides fresh air to the system.
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The ventilation control is clearly labeled by the installer

The ventilation control is clearly labeled by the installer
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The ventilation controller is next to the thermostat and has a manual override button

The ventilation controller is next to the thermostat and has a manual override button
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The very high efficiency (4.7 COP) ground-source heat pump provides hot water to a tank for radiant floor heat and domestic hot water.

The very high efficiency (4.7 COP) ground-source heat pump provides hot water to a tank for radiant floor heat and domestic hot water.
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There is a filter installed to filter outdoor air

There is a filter installed to filter outdoor air
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There is no filter installed in the HVAC system

There is no filter installed in the HVAC system
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There is no filter installed to filter the outdoor air

There is no filter installed to filter the outdoor air
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Thermometer used to measure dry-bulb temperature

Thermometer used to measure dry-bulb temperature
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Thermostatic radiator valve operation

Thermostatic radiator valve operation
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Thermostatic radiator valve schematic

Thermostatic radiator valve schematic
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These ducts were installed within the home's conditioned space in a central chaise down the main hallway.

These ducts were installed within the home's conditioned space in a central chaise down the main hallway.
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These plots compare sizing approaches in terms of the approximate annual heating load a heat pump might carry throughout the year for a hypothetical home in Minneapolis, MN.

These plots compare sizing approaches in terms of the approximate annual heating load a heat pump might carry throughout the year for a hypothetical home in Minneapolis, MN.
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These two schematics show the plan-view of the same duct system; the upper schematic shows all supply and return outlets and inlets uncovered for normal operation, and the lower schematic shows them covered before beginning a duct leakage test.

These two schematics show the plan-view of the same duct system; the upper schematic shows all supply and return outlets and inlets uncovered for normal operation, and the lower schematic shows them covered before beginning a duct leakage test.
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This “high static ducted cassette” heat pump system is similar to a traditional centrally ducted system, serving several areas of a home from one indoor unit

This “high static ducted cassette” heat pump system is similar to a traditional centrally ducted system, serving several areas of a home from one indoor unit
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This air filter is too big for the air filter slot; the filter should not be installed diagonally; it should lay flat against the opening.

This air filter is too big for the air filter slot; the filter should not be installed diagonally; it should lay flat against the opening.