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This close-up of an exterior wall retrofit of a masonry brick home shows the fluid-applied water and air control layer (white), 2x4 furring strips and two layers of rigid foam insulation (pink), then 1x4 furring which provides a ventilation gap

This close-up of an exterior wall retrofit of a masonry brick home shows the fluid-applied water and air control layer (white), 2x4 furring strips and two layers of rigid foam insulation (pink), then 1x4 furring which provides a ventilation gap
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This constant airflow regulator (CAR) has been fouled by aerosolized sealant because it was not covered while the ducts were being sealed with the aerosolized acrylic sealant.

This constant airflow regulator (CAR) has been fouled by aerosolized sealant because it was not covered while the ducts were being sealed with the aerosolized acrylic sealant.
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This constant airflow regulator (CAR) has been fouled by deposition of aerosolized sealant because it was not protected during duct sealing

This constant airflow regulator (CAR) has been fouled by deposition of aerosolized sealant because it was not protected during duct sealing
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This damper located at the top of a stairwell in a multistory building is automatically kept closed to reduce energy loss; it automatically opens during a smoke event.

This damper located at the top of a stairwell in a multistory building is automatically kept closed to reduce energy loss; it automatically opens during a smoke event.
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This energy recovery ventilator (ERV) provides balanced ventilation to a dwelling unit in a multifamily building

This energy recovery ventilator (ERV) provides balanced ventilation to a dwelling unit in a multifamily building
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This experimental earth tube is 220 ft long, 8 inches in diameter, and is buried 10 feet deep

This experimental earth tube is 220 ft long, 8 inches in diameter, and is buried 10 feet deep
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This experimental radiative/evaporative hybrid cooling system uses water to reject heat at night through radiation and evaporation

This experimental radiative/evaporative hybrid cooling system uses water to reject heat at night through radiation and evaporation
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This highly efficient 1,290-ft2 home by Habitat for Humanity of South Sarasota County, Florida, is built to the requirements of the U.S. Department of Energy (DOE) Zero Energy Ready Home program and has low utility bills of about $72 per month.

This highly efficient 1,290-ft2 home by Habitat for Humanity of South Sarasota County, Florida, is built to the requirements of the U.S. Department of Energy (DOE) Zero Energy Ready Home program and has low utility bills of about $72 per month.
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This home’s balanced fresh air system includes a filtered fresh air intake that is wired to the central HVAC system with timer controls while exhaust fans in the kitchen, bathrooms, and laundry room pull stale and moist air from the home.

This home’s balanced fresh air system includes a filtered fresh air intake that is wired to the central HVAC system with timer controls while exhaust fans in the kitchen, bathrooms, and laundry room pull stale and moist air from the home.
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This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home

This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home
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This HVAC air filter slot contains a 1-inch-thick filter but the slot is designed to accept either a 1-inch or a 4-inch air filter.

This HVAC air filter slot contains a 1-inch-thick filter but the slot is designed to accept either a 1-inch or a 4-inch air filter.
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This HVAC air filter slot is covered with a door that is held in place with spring clips and tabs.

This HVAC air filter slot is covered with a door that is held in place with spring clips and tabs.
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This multistory stairwell has an automatic damper that is integrated with the engineered smoke control system.

This multistory stairwell has an automatic damper that is integrated with the engineered smoke control system.
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This night ventilation cooling system is timer-controlled and ducted to the home's HVAC ducts to bring in filtered fresh air at night.

This night ventilation cooling system is timer-controlled and ducted to the home's HVAC ducts to bring in filtered fresh air at night.
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This outdoor air intake grille provides a safe and accessible location for measuring whole-house ventilation air flow

This outdoor air intake grille provides a safe and accessible location for measuring whole-house ventilation air flow
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This range hood has been vented through the cabinet then through the wall to the outside.

This range hood has been vented through the cabinet then through the wall to the outside.
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This return grille is located in a central hallway in the home and stale air is pulled through this grille and the air filter located behind it to return to the HVAC system for heating or cooling.

This return grille is located in a central hallway in the home and stale air is pulled through this grille and the air filter located behind it to return to the HVAC system for heating or cooling.
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This room has several passive and low-energy cooling features including a ceiling fan, fully operable French doors, window shading, an outdoor water feature, and light-colored hard-scaping.

This room has several passive and low-energy cooling features including a ceiling fan, fully operable French doors, window shading, an outdoor water feature, and light-colored hard-scaping.
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This solar powered attic fan runs when the sun is shining and does not draw any power from the home’s electrical system

This solar powered attic fan runs when the sun is shining and does not draw any power from the home’s electrical system
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This traditional whole-house fan uses uninsulated gravity dampers.

This traditional whole-house fan uses uninsulated gravity dampers.
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This typical central ductwork system for a multifamily building includes all ductwork sections, such as vertical risers, main trunks, horizontal run outs, branches, and take-offs

This typical central ductwork system for a multifamily building includes all ductwork sections, such as vertical risers, main trunks, horizontal run outs, branches, and take-offs
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This wall and window assembly has excessive framing around the windows, which can lead to heat gain in how climate zones.

This wall and window assembly has excessive framing around the windows, which can lead to heat gain in how climate zones.
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This wood-framed wall is connected with framing anchors, metal strapping and ties, and anchor bolts to secure the roof to the walls and walls to the foundation

This wood-framed wall is connected with framing anchors, metal strapping and ties, and anchor bolts to secure the roof to the walls and walls to the foundation
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Thornhill Custom Homes built this custom spec home in the hot-humid climate in Dallas, TX, and certified it to DOE Zero Energy Ready Home specifications in 2017.

Thornhill Custom Homes built this custom spec home in the hot-humid climate in Dallas, TX, and certified it to DOE Zero Energy Ready Home specifications in 2017.