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Wrong - Air conditioning compressor unit should be sitting on concrete pad installed directly on ground.

Wrong - Air conditioning compressor unit should be sitting on concrete pad installed directly on ground.
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Wrong - Air filter was compressed and may not function effectively to filter return air.

Wrong - Air filter was compressed and may not function effectively to filter return air.
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Wrong - Ceiling HVAC register is improperly installed on an angled ceiling.

Wrong - Ceiling HVAC register is improperly installed on an angled ceiling.
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Wrong - Class I vapor retarder over framed basement walls can cause condensation, mold, and rotting because plastic prevents drying to the inside; the outside should have waterproofing and vertical drainage, and the framing should be spaced from the wall.

Wrong - Class I vapor retarder over framed basement walls can cause condensation, mold, and rotting because plastic prevents drying to the inside; the outside should have waterproofing and vertical drainage, and the framing should be spaced from the wall.
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Wrong - Duct insulation and vapor barrier do not cover all of the flex duct.

Wrong - Duct insulation and vapor barrier do not cover all of the flex duct.
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Wrong - Duct juncture seam should be sealed with metal tape or mastic.

Wrong - Duct juncture seam should be sealed with metal tape or mastic.
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Wrong - Duct seams were sealed with regular duct tape which has failed to hold; seams should have been sealed with mastic or approved metal tape.

Wrong - Duct seams were sealed with regular duct tape which has failed to hold; seams should have been sealed with mastic or approved metal tape.
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Wrong - Duct-duct joint is not sealed.

Wrong - Duct-duct joint is not sealed.
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Wrong - Flex duct insulation is overly compressed in 3 ways; Zip-tie fastener is over the insualtion not under the insulation at the duct boot collar, duct turning radius is too tight, and support strap is too tight.

Wrong - Flex duct insulation is overly compressed in 3 ways; Zip-tie fastener is over the insualtion not under the insulation at the duct boot collar, duct turning radius is too tight, and support strap is too tight.
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Wrong - Flex duct is improperly attached and sealed to duct boot.

Wrong - Flex duct is improperly attached and sealed to duct boot.
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Wrong - Flex duct pinched by bracing

Wrong - Flex duct pinched by bracing
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Wrong - Flex duct resting on floor compressing insulation and causing condensation

Wrong - Flex duct resting on floor compressing insulation and causing condensation
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Wrong - Flex duct with sharp turn restricting air flow

Wrong - Flex duct with sharp turn restricting air flow
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Wrong - Furnace return air filter is dirty and needs to be replaced.

Wrong - Furnace return air filter is dirty and needs to be replaced.
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Wrong - Heat ERV energy exchange core has become completely clogged with dirt.

Wrong - Heat ERV energy exchange core has become completely clogged with dirt.
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Wrong - Hole in duct is not sealed and duct joint to subfloor is not sealed.

Wrong - Hole in duct is not sealed and duct joint to subfloor is not sealed.
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Wrong - Hole in duct needs to be sealed.

Wrong - Hole in duct needs to be sealed.
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Wrong - Home owner has ignored HVAC system warning to replace air filter.

Wrong - Home owner has ignored HVAC system warning to replace air filter.
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Wrong - Home owner has ignored system alerts on smart thermostat.

Wrong - Home owner has ignored system alerts on smart thermostat.
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Wrong - HVAC metal cabinet seam is not sealed with mastic or metal tape.

Wrong - HVAC metal cabinet seam is not sealed with mastic or metal tape.
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Wrong - HVAC return air filter has not been replaced for over a year.

Wrong - HVAC return air filter has not been replaced for over a year.
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Wrong - HVAC rigid metal duct seam needs to be air sealed with mastic or metal tape.

Wrong - HVAC rigid metal duct seam needs to be air sealed with mastic or metal tape.
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Wrong - Metal tape is poorly adhered and metal duct and duct-to-subfloor seam is not sealed.

Wrong - Metal tape is poorly adhered and metal duct and duct-to-subfloor seam is not sealed.
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Wrong - Not enough straps were used to hang this flex duct so it is sagging, restricting air flow

Wrong - Not enough straps were used to hang this flex duct so it is sagging, restricting air flow