Showing results 1 - 50 of 104
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A battery storage system can provide reliable back-up power during a grid power outage
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A boiler system can be set up with primary and secondary loops to supply hot water for multiple uses
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A Category I induced draft boiler uses an induced draft fan to pull air through the combustion chamber and to the flue
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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 high-efficiency gas boiler provides hot water to the faucets, to radiant heating loops in the basement floor, and to a hydro-coil for a central air heating system.
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A high-efficiency heat pump is installed in a closet within this home’s conditioned space.
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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 single ductless heat pump heats and cools the country’s first DOE Zero Energy Ready certified manufactured home.
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After setting precast concrete basement walls on an 8-inch bed of trap rock, this builder sprayed 2 inches of closed-cell spray foam directly onto the ground then laid piping for radiant floor heating before pouring the concrete floor slab.
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An ultra-efficient layer of R-20 rigid foam foundation insulation covers the ground underneath the vapor barrier and radiant floor loops, which will circulate water heated by an ultra-efficient geo heat pump.
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By plotting the heating capacities at -4°F and 5°F and drawing a line between them, the capacity at 0°F can be estimated
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Category III oil-fired, sealed-combustion boiler configured as a direct-vented appliance that draws its combustion air from outside
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Category III oil-fired, sealed-combustion boiler with the burner assembly cover removed
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Cold-climate heat pumps can provide heating and cooling even in climate zone 7; this home retained a fuel oil boiler system for backup on the coldest days.
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Conduction is heat transferred by contact, like the hot pan that fries an egg or the hot asphalt that burns bare feet.
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Convection is heat transferred via air or liquid movement in a pattern of cooling/falling and warming/rising like hot water that rises and falls in a percolating coffee pot.
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Ductless indoor units like this one are controlled individually by handheld remote controllers.
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Heated air flow is produced when the heating cycle is energized (set thermostat to “heat”)
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Hot water for the home’s radiant floor heating system comes from roof-mounted solar thermal panels and an air-to-water heat pump provide.
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In a Category I gas-fired, natural-draft boiler, the natural draft of the heated flue pulls combustion air through the draft hood into the combustion chamber
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In heating mode, split system heat pumps absorb heat from the outside air and “pump” that heat to the indoor air handler unit, which releases it to the inside air.
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Passive cooling techniques can reduce or eliminate the use of air conditioning and can be used for backup cooling during emergencies.
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PEX piping is laid over 2 inches of XPS before the slab is poured to create a radiant floor heating system in this extensive home remodel.
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PEX piping loops are laid before the slab is poured for this radiant floor heating system
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Radiation is heat transferred through space by rays, like rays of sun that warm your skin if the rays are not blocked by a building or tree.
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Right - An energy recovery ventilation (ERV) brings fresh air into the home while exhausting stale air. Both ducts pass through a heat exchanger where heat from the warmer duct is transferred to the cooler duct.