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Some whole-house fans are equipped with an automatic drop-down cover to provide an air seal at the ceiling level when the fan is not in use

Some whole-house fans are equipped with an automatic drop-down cover to provide an air seal at the ceiling level when the fan is not in use
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Some whole-house fans use an automatic insulated cover achieve high R-values when the fan is not in use

Some whole-house fans use an automatic insulated cover achieve high R-values when the fan is not in use
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Sources of heat gain in a house include solar gains, infiltration, conduction through walls and roof, occupants, and internal equipment

Sources of heat gain in a house include solar gains, infiltration, conduction through walls and roof, occupants, and internal equipment
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Sources of heat gain in a house include solar gains, infiltration, conduction through walls and roof, occupants, and internal equipment

Sources of heat gain in a house include solar gains, infiltration, conduction through walls and roof, occupants, and internal equipment
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Sun paths through the sky in winter, spring, summer, and fall show that a home receives the most sun from the south in the winter and from the east/west in the summer

Sun paths through the sky in winter, spring, summer, and fall show that a home receives the most sun from the south in the winter and from the east/west in the summer
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Tall annuals, like the sunflowers in this picture, can provide very effective shade in summer (left), provide a pleasant view from inside (right), and allow sun into the home in winter when the plants die back.

Tall annuals, like the sunflowers in this picture, can provide very effective shade in summer (left), provide a pleasant view from inside (right), and allow sun into the home in winter when the plants die back
Video:

Tankless Water Heater

Case Study:

Technology Solutions Case Study: Advanced Controls Improve Performance of Combination Space and Water Heating Systems, Minneapolis, Minnesota

Case Study:

Technology Solutions Case Study: Advanced Controls Improve Performance of Combination Space- and Water-Heating Systems

Case Study:

Technology Solutions Case Study: Combustion Safety for Appliances Using Indoor Air

Case Study:

Technology Solutions Case Study: Idaho, Oregon, and Washington Manufactured Home Builders

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Temperatures in deep undisturbed soil at a given location are approximately equal to the annual average air temperature for that location

Temperatures in deep undisturbed soil at a given location are approximately equal to the annual average air temperature for that location
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The cabinet above this refrigerator will keep it from tipping forward during a seismic event

The cabinet above this refrigerator will keep it from tipping forward during a seismic event
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The condensate line (amber-colored plastic tube) from the high-efficiency furnace drains into the sewer via the same drain pipe as the clothes washer

The condensate line (amber-colored plastic tube) from the high-efficiency furnace drains into the sewer via the same drain pipe as the clothes washer
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The cool shingles on the right have been coated with a ceramic coating to reflect near-infrared radiation, resulting in a cooler roof as shown by these thermal images (red and yellow are hotter, green and blue are cooler).

The cool shingles on the right have been coated with a ceramic coating to reflect near infrared radiation, resulting in a cooler roof as shown by these thermal images (red and yellow are hotter, green and blue are cooler).
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The design of this home incorporates multiple methods to reduce summertime solar gains including roll-down exterior blinds, wide exterior horizontal louvers, minimized east/west-facing windows, and vegetation.

The design of this home incorporates multiple methods to reduce summertime solar gains including roll-down exterior blinds, wide exterior horizontal louvers, minimized east/west-facing windows, and vegetation.
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The DOE Efficient Window Coverings website identifies twelve categories of interior window shading attachments.

The DOE Efficient Window Coverings website identifies twelve categories of interior window shading attachments.
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The Efficient Window Coverings website allows direct comparison of various window attachment types based on thermal, visual, functional, and installation and durability criteria.

The Efficient Window Coverings website allows direct comparison of various window attachment types based on thermal, visual, functional, and installation and durability criteria.
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The EnergyGuide label for this refrigerator shows that it is estimated to use 630 kWh/yr (approximately 1.7 kWh per day) based on a standard test procedure

The EnergyGuide label for this refrigerator shows that it is estimated to use 630 kWh/yr (approximately 1.7 kWh per day) based on a standard test procedure
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The existing dark tile roof on this home (top photo) was covered with a light -colored coating on day 6 (middle photo), resulting in a significant reduction in attic temperature and cooling energy consumption (bottom)

The existing dark tile roof on this home (top photo) was covered with a light -colored coating on day 6 (middle photo), resulting in a significant reduction in attic temperature and cooling energy consumption (bottom)
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The frequency, duration, and intensity of extreme heat events have increased every decade since the 1960s

The frequency, duration, and intensity of extreme heat events have increased every decade since the 1960s
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The IR image on the right shows the sun is heating the southeast-facing wall of this concrete-block house to 36C (97F); this corner of the home would not be a good place for a cool room due to lack of shading and insulation

The IR image on the right shows the sun is heating the southeast-facing wall of this concrete-block house to 36C (97F); this corner of the home would not be a good place for a cool room due to lack of shading and insulation
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The light-colored exterior roll-down shades on this building, and the shaded entryway provide very effective control of solar heat gain

The light-colored exterior roll-down shades on this building, and the shaded entryway provide very effective control of solar heat gain
Video:

The Mechanics of a Ground Source Heat Pump