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The hole in the drywall was cut overly large for this heating register, allowing air to leak into or out of the wall cavities.

The hole in the drywall was cut overly large for this heating register, allowing air to leak into or out of the wall cavities.
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The HVAC equipment's condensate drain pan is equipped with a water-level detection device that will shut off the equipment if the water level pan in the pan gets too high

The HVAC equipment's condensate drain pan is equipped with a water-level detection device that will shut off the equipment if the water level pan in the pan gets too high
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The inside refrigerant line leading from the air conditioner or heat pump to the wall should be covered with pipe insulation and a vapor barrier to reduce condensation potential and improve system efficiency.

The inside refrigerant line leading from the air conditioner or heat pump to the wall should be covered with pipe insulation and a vapor barrier to reduce condensation potential and improve system efficiency.
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The mechanical room in the insulated basement houses the water heating equipment, including the storage tank for the solar thermal system and the wall-hung boiler as well as the air handler for the hydro coil and high-efficiency (16 SEER) air conditioner.

The mechanical room in the insulated basement houses the water heating equipment, including the storage tank for the solar thermal system and the wall-hung boiler as well as the air handler for the hydro coil and high-efficiency (16 SEER) air conditioner.
Video:

The Mechanics of a Ground Source Heat Pump

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The natural draft and induced draft furnace are both Category I appliances that receive combustion air from the combustion appliance zone

The natural draft and induced draft furnace are both Category I appliances that receive combustion air from the combustion appliance zone
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The NEEP Cold Climate Air Source Heat Pump List allows users to search, sort, and filter for cold climate heat pumps by brand, model, product type, and ducting configuration; an advanced search provides helpful resources for sizing to the heating load

The NEEP Cold Climate Air Source Heat Pump List allows users to search, sort, and filter for cold climate heat pumps by brand, model, product type, and ducting configuration; an advanced search provides helpful resources for sizing to the heating load
Case Study:

The New American Home 2011 Orlando, Florida

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The passive flow hood (at left) and powered flow hood (right) shown here side by side can be used to measure air flow through outside air intakes, exhaust fans air conditioner supply grills, ERVs, etc.

The passive flow hood (at left) and powered flow hood (right) shown here side by side can be used to measure air flow through outside air intakes, exhaust fans air conditioner supply grills, ERVs, etc.
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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 small heat pump located on top of the tank on a heat pump water heater extracts heat from the surrounding air to create hot water

The small heat pump located on top of the tank on a heat pump water heater extracts heat from the surrounding air to create hot water
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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 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 ultra-efficient ground-source heat pump provides the home with forced-air heating and cooling, and hot water.

The ultra-efficient ground-source heat pump provides the home with forced-air heating and cooling, and hot water.
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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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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 are the exhaust pipe and air intake pipe for a high-efficiency condensing gas furnace; because the exhaust from a high-efficiency furnace is relatively cool, the exhaust pipe, like the air intake pipe can be made of PVC.

These are the exhaust pipe and air intake pipe for a high-efficiency condensing gas furnace; because the exhaust from a high-efficiency furnace is relatively cool, the exhaust pipe, like the air intake pipe can be made of PVC.
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These ERV/HRV configurations are NOT recommended because outdoor air can be sucked back into the ERV/HRV before being distributed to the living space

These ERV/HRV configurations are NOT recommended because outdoor air can be sucked back into the ERV/HRV before being distributed to the living space
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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.