Showing results 301 - 400 of 578
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Right - Ducts and heat pump cabinet are properly sealed with mastic, high MERV filter is installed, and duct and refrigerant lines are air sealed at ceiling.
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Right - Each individual unit in this multifamily building has its own energy recovery ventilator (ERV) to provide balanced ventilation to the dwelling
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Right - Flaps are cut into house wrap installed over an HRV duct then taped out of the way to install flashing; 8 of 14.
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Right - Flex duct installed with adequate support and pulled taut to provide adequate air flow
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Right - Flex duct installed with frequent supports, straight runs, and gradual turns to allow good air flow
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Right - Insulating sleeve for small through-the-wall HRV unit with sealing gasket; 3 of 14.
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Right - Open-cell polyurethane spray foam to R-28 on underside of roof turns new attic into conditioned space for HVAC.
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Right - Straps are spaced close enough together to provide adequate support of the flex duct
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Right - The advanced controls in a programmable thermostat can be used to improve the efficiency of the home’s HVAC system.
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Right - The air handler for this geothermal heat pump is located in conditioned space.
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Right - The electronics for this home’s smart home system, including a Wi-Fi router, and controls for lighting, HVAC, security, energy production and tracking are housed together with the electrical panel and HVAC equipment in the home’s utility room.
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Right - The exhaust duct has been mechanically fastened and sealed with mastic.
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Right - The exhaust vent duct terminates to the outdoors with a vent cover that has been properly caulked and covered with a metal pest screen.
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Right - The geothermal heat pump provides hot water for radiant floor heating, domestic hot water, and the air handler for space conditioning upstairs.
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Right - The home’s high-efficiency gas boiler provides domestic hot water as well as in-floor radiant heat, while a high-efficiency heat pump provides cooling and a secondary source of heating.
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Right - The HVAC ducts are located in conditioned space in a dropped hallway ceiling with very short duct runs for more efficient delivery.
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Right - The precast insulated concrete walls of the basement provide a conditioned space for the high-efficiency (18 SEER, 9.5 HSPF) air-source heat pump, with its variable-speed fan, five-stage compressor, and MERV 11 filter.
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Right - This ductless minisplit uses a ceiling-mounted rather than wall-mounted air handler.
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Right - This enclosed parking garage in a multistory multifamily building is equipped with mechanical exhaust to remove airborne contaminants from the garage.
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Right - This evaporative cooler is wall mounted to reduce leak effects and allow for ease of maintenance.
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Right - This manufacturer's label shows a CFM higher than the requirement, increasing the likelihood that it will meet the performance level once installed.
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Right - This shared enclosed parking garage is equipped with exhaust fans to remove airborne contaminants from the garage.
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Right - Two high-efficiency (12 HSPF, 26 SEER) ductless mini-split heat pumps heat and cool the home.
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Right – A transfer grille is installed high on a bedroom wall in a new-construction home
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Right – Adequate space is provided near the air handler for the water lines of this ground-source heat pump.
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Right – All of the cabinet seams in this HVAC air furnace are sealed with an approved metal tape.
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Right – An insulated space is provided in the home’s attic to house the HVAC equipment.
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Right – Flex ducts are properly supported with straps that don’t pinch the insulation; closed-cell spray foam will be applied to the underside of the roof deck of this hot-humid climate home to provide an insulated attic space for the HVAC ducts.
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Right – Holes were drilled into the I joists between floors to run the small-diameter HRV ducts.
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Right – HVAC furnace filter is properly installed in cabinet with gasketed cover to prevent air leakage
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Right – R-25 of open-cell spray foam lines this new home’s attic ceiling, to protect HVAC ducts from heat and cold.
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Right – Rigid foam is installed behind HVAC ducts to provide additional insulation to the ducts which are installed within the conditioned space.
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Right – Spray foam air seals and insulates the walls including the walls behind the fireplace and covers the underside of the roof deck of this mixed-dry climate home to provide an insulated attic space for HVAC ducts.
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Right – The builder has provided homeowners manuals and racks to hold them on the side of the HVAC cabinet in the utility room.
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Right – The corridor in this multistory building is pressurized with outdoor supply air.
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Right – The double compressor unit supplies multiple interior minisplit heat pump heads.
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Right – The ductless minisplit in this open area is installed in the ceiling rather than on a wall.
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Right – The elevator lobby of this multistory building is pressurized with outdoor air supplied to the space through this ceiling supply register.
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Right – The HVAC compressor is installed on a raised platform with a protective railing installed.
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Right – The HVAC compressor sits on a raised cantilever platform away from the base flood elevation.
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Right – The HVAC outdoor unit is anchored on a bed of masonry bricks, 1 foot or more above the base flood elevation.
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Right – The outside unit of the mini-split heat pump system is installed on a concrete pad and away from shrubs.
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Right – This exhaust fan use metal ducting that goes directly to the soffit to minimize penetrations through the roof.
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Right – This home’s HVAC system consists of a ground source heat pump that provides heating and cooling with a rated efficiency of 5.0 COP.
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Right – This sealed combustion gas furnace has a fresh air intake with an electronically controlled damper.
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Right – Transfer grilles are installed over doorways to bedrooms in a new-construction home
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Right – Transfer grilles, Jump ducts, and wall grilles provide passive returns for air returning from bedrooms to the central HVAC system
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Right (decent): For a relatively high-capacity ccASHP sized per Approach 3 or 4 to meet nearly 100% of the heating load, this heat pump’s modulating zone has a decent overlap with the home’s heating load line, reducing short-cycling.
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Right: A well-constructed air handler closet
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Right: Air seal all seams in the return air plenum before installing a new air handler
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Right: If existing straps are narrower than 1.5 inches, add sheet metal saddles to keep the duct from sagging and pinching
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Right: Refrigerant piping is sealed where it exits the return plenum
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Right: Sized per Approach 1, this heat pump will have minimal short-cycling; since sized using Approach 1, it will require backup heat when temp is below 30°F but could still contribute significant heating down to heating design temp (-6°F) and lower
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Right: Sized per Approach 3 or 4, this heat pump’s modulating zone has a large overlap with the home’s heating load line, resulting in minimal short-cycling; the unit may require a small amount of backup heat during the very coldest hours of winter.
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Right: Sized per Approach 3, this heat pump’s modulating zone has a large overlap with the home’s heating load line; it will require backup heating but could still contribute significant heating for all hours of the heating season
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Right: The bottom of the air handler cabinet is well sealed to the return platform
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Right: The plenum liner is well sealed to the filter-backed grille
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Right: Use mastic to air seal the return air plenum and to seal around refrigerant lines coming from the slab in the floor of the return
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Seal all joints and seams in the metal ductwork with mastic before installing insulation
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Seal seams in fiber board ducts with out-clinching staples, UL-181A-approved tape, and mastic
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Separate exhaust fans can share a common exhaust if each exhaust fan is equipped with a back-draft damper to prevent cross contamination
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Seperate dwellings with their own seperate exhaust terminations
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Simplified schematic of a one-pipe steam system showing the main and risers with fast vents and the radiators with slow vents
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Small, battery-powered evaporative coolers can be appropriate for personal cooling in arid climates (only)
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Some radiators are behind covers so the cover must be removed to identify the air vent
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Straps are spaced too far apart causing the straps to compress the duct under its own weight
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Supply-only ventilation with a fresh air intake ducted to the return side of a horizontal air handler unit located in the attic
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Supply-only ventilation with a fresh air intake ducted to the return side of a vertical air handler unit located in the house
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The AC unit has a drip pan and automatic shutoff in case the condensate drain gets clogged.
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The air handler of the air-to-water heat pump is equipped with a very high efficiency air filter and a damper-controlled fresh air intake.
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The airflow direction is labeled on the edge of the filter to ensure it is properly oriented when installed.
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The back-draft damper on this exhaust fan is closed to prevent cross contamination
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The back-draft damper on this exhaust fan is open when the exhaust fan is operating
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The back-draft damper open when the fan is actively exhausting and closes when the fan is off
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The basement is half in and half out of the ground with only 4 feet below grade, which allows for full 36-inch-tall windows that are completely above grade.
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The blower wheel (fan) on this ductless wall-mounted indoor unit has accumulated dust and mold - a common issue for this design.
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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
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The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the return side of the air handler for conditioning, mixing, and distribution