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The duct sealing spray injection system application tunnel inflates as the injection system operates

The duct sealing spray injection system application tunnel inflates as the injection system operates
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The duct sealing spray injection system includes a blower/heater (background) and the sealant injection unit (foreground)

The duct sealing spray injection system includes a blower/heater (background) and the sealant injection unit (foreground)
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The duct tester and blower door are set up to measure leakage to the outdoors

The duct tester and blower door are set up to measure leakage to the outdoors
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The duct tester is set up to depressurize the duct system.

The duct tester is set up to depressurize the duct system.
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The ducts are located in conditioned space in open-web joists between the floors and supported to prevent sagging.

The ducts are located in conditioned space in open-web joists between the floors and supported to prevent sagging.
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The edge of this 1-inch HVAC filter indicates it's dimensions, allowing proper matching of filter to air handler

The edge of this 1-inch HVAC filter indicates it's dimensions, allowing proper matching of filter to air handler
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The ENERGY STAR logo on the manufacturer’s label indicates this is an ENERGY STAR qualifying exhaust fan

The ENERGY STAR logo on the manufacturer’s label indicates this is an ENERGY STAR qualifying exhaust fan
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The exposed riser shown here also supplies the radiator. A short pipe runs under the floor to the hand valve.

The exposed riser shown here also supplies the radiator. A short pipe runs under the floor to the hand valve.
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The fan does have an ENERGY STAR label

The fan does have an ENERGY STAR label
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The fan does not have an ENERGY STAR label

The fan does not have an ENERGY STAR label
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The filter is installed in the crawlspace and is not easily accessible

The filter is installed in the crawlspace and is not easily accessible
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The foil-faced insulation behind this fireplace provides an air barrier and thermal shield.

The foil-faced insulation behind this fireplace provides an air barrier and thermal shield.
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The gap around this kitchen exhaust duct represents a significant source of air leakage to the unconditioned attic

The gap around this kitchen exhaust duct represents a significant source of air leakage to the unconditioned attic
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The gap between the air filter and the return duct opening has been sealed with tape that will stop air flow but is easily pulled off or cut through when the filter needs to be replaced.

The gap between the air filter and the return duct opening has been sealed with tape that will stop air flow but is easily pulled off or cut through when the filter needs to be replaced.
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The gap between the duct boot and the drywall is air sealed by covering the seam with fiberglass mesh tape and mastic.

The gap between the duct boot and the drywall is air sealed by covering the seam with fiberglass mesh tape and mastic.
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The gaps around this duct boot are sealed with canned spray foam.

The gaps around this duct boot are sealed with canned spray foam.
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The gaps around this HVAC boot have been air sealed with spray foam to limit air leakage between the conditioned space and the basement or crawlspace.

The gaps around this HVAC boot have been air sealed with spray foam to limit air leakage between the conditioned space and the basement or crawlspace.
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The gaps between the sheet metal of the duct boot and the drywall are clearly visible in this image.

The gaps between the sheet metal of the duct boot and the drywall are clearly visible in this image.
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The grille in the photo on the left brings air into a return air plenum under an air handler platform. As shown in the infrared image on the right, the plenum is not air sealed so hot attic air is being pulled into the air handler closet.

The grille in the photo on the left brings air into a return air plenum under an air handler platform. As shown in the infrared image on the right, the plenum is not air sealed so hot attic air is being pulled into the air handler closet.
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The grooves and ridges within flexible ducts can collect dust and dirt

The grooves and ridges within flexible ducts can collect dust and dirt
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The high-efficiency air-to-air heat pump is set in an overflow pan with an emergency shut off sensor in case the condensate tube were to clog and cause condensate to fill up the pan.

The high-efficiency air-to-air heat pump is set in an overflow pan with an emergency shut off sensor in case the condensate tube were to clog and cause condensate to fill up the pan.
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The high-efficiency mini-split heat pump provides cooling and heating; a drain pipe carries condensate away to a location that meets local code requirements.

The high-efficiency mini-split heat pump provides cooling and heating; a drain pipe carries condensate away to a location that meets local code requirements.
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The hole in the drywall was cut overly large for this heating register, allowing air to leak into or out of the wall cavities.

The hole in the drywall was cut overly large for this heating register, allowing air to leak into or out of the wall cavities.
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The HVAC equipment's condensate drain pan is equipped with a water-level detection device that will shut off the equipment if the water level pan in the pan gets too high

The HVAC equipment's condensate drain pan is equipped with a water-level detection device that will shut off the equipment if the water level pan in the pan gets too high