Showing results 1 - 50 of 147
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A 5,000- 6,000 Btu/hr air conditioner drawing about 500 watts can be installed in one window of a designated cool room (it is important that the installation is insulated and well-sealed
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A battery storage system can provide reliable back-up power during a grid power outage
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A cool roof utilizes materials with high solar reflectance and thermal emittance to reflect solar energy and reduce heat gain to the home
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A cool room should have low enough heat gains to be easily cooled by a small single-zone cooling system such as a mini-split or a window air-conditioner as shown here
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A ground source heat pump with an open-loop piping system using vertical injection and recharge
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A ground-source heat pump has the same components as a standard air-to-air heat pump except that the liquid-to-refrigerant heat exchanger coil is located inside rather than outside
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A ground-source heat pump with a closed-loop horizontal “Slinky™ “piping arrangement
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A mini-split air-conditioning system can be a highly effective low-energy approach to provide cooling to one designated zone in the house
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A modern single-inlet direct evaporative cooler draws outside air through an 8- to 12-inch media filter
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A properly sized cold climate heat pump can meet 100% of a home’s heating load in nearly any location in the United States
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A reversible window fan can operate via thermostatic or remote control and can selectively exhaust air or bring in outdoor air
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A screened-in porch will protect windows from rain, provide shade, and allow more airflow through windows than window screens would
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A shallow, open floor plan allows free flow of cross ventilation through the house
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A variety of battery-powered fans can be used for a cool room without electric power; most charge off a USB charger so they can be solar charged
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Air seal a heat pump or air conditioner air handler cabinet at all seams, holes, and junctions
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Air speeds generated by a typical ceiling fan are in the ideal range for providing occupant cooling without causing disruption
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Airflow can be directed across thermal mass in the ceiling, floor, or elsewhere inside the home through various window and louver configurations
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An innovative U-shaped heat pump offers SEER 15 efficiency and operation with smart phones
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Building Science Corporation used convection to help cool this structural insulated panel (SIP) cottage in Georgia.
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Ceiling fans can be used to aid a night flush strategy by helping to cool down wall and floor surfaces more thoroughly at night, and by providing comfort ventilation during the day
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Comfort ventilation focuses on airflow over occupants; in this example of wind-driven cross ventilation, the air is directed through the main occupied areas of the bedroom
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Concept behind an evaporative cooler – warm air is cooled as the air passes through a wet medium and gives up some of its heat to evaporate the water
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Cool towers like this one at the Zion National Park Visitor Center can provide cooling to a building without any energy consumption
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Cooling air temperatures that can be achieved by a direct evaporative cooler at various outdoor conditions
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Create a cool room to shelter from extreme heat by selecting a room in the basement or on the north or shaded side of the house, air sealing and insulating, providing low-wattage and battery-operated cooling, and reducing interior heat loads.
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Deep overhangs and porches provide midday shade for most of the windows on this home in Albuquerque, NM.
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Dense hedges can encourage cross ventilation (left image) or not (right image) depending on how they are placed relative to windows
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Double fan window units can have multiple operational modes; most often outdoor air will be brought in at night when outdoor conditions are cooler
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Ducted whole-house fans should be installed with the duct curved and the fan suspended from rafters to reduce noise and vibration transmission to the living area.
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Ductless indoor units like this one are controlled individually by handheld remote controllers.
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Ductwork located in a vented attic is subject to high attic temperatures and significant heat gain through the walls of the ducts
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Earth tubes buried in the ground can provide pre-cooling of ventilation air or primary cooling if designed deep and long enough
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ENERGY STAR-rated ceiling fans and openable windows oriented to prevailing summer breezes help provide low-cost cooling.
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Evaporative Cooler Sizing in ACH based on wet-bulb temperatures at 1% summer design conditions
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Evaporative coolers use a fan to draw outside air through a wetted pad which cools and humidifies it
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Evaporative cooling is most appropriate in areas where the summer design mean coincident wet bulb temperature is less than 70°F, shown in purple here and labeled as region “A”
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Even when wind is blowing parallel to a wall, an open casement window can create a zone of higher pressure near the window opening, driving airflow into the house
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Example expanded performance table from a 1.5-ton air conditioner
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Example of an earth-sheltered home in hot climate Tempe, AZ uses the cooling properties of the ground to decrease cooling costs