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After personally
inspecting over 600 existing homes, ranging in age from 1 year to 12 years, I
have found that the following list of deficiencies common in most homes
that I have inspected.
Discovered Common
Deficiencies
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Temperature differentials between rooms.
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Lack of engineering specific to the home orientation and
room-by-room requirements.
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Lack of cooling capacity.
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Cooling coil not matched with SEER rating of condensing unit.
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Lack of air balancing.
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CFM not distributed in accordance to space requirements.
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Poor air distribution.
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Low total system air flows.
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Poor duct sizing.
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Poor duct zoning.
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Lack of transitional air flow into supply register ceiling
boots (B Boxes).
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Shallow return air ceiling boots.
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Small supply air plenums, no cushion head.
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Lack of adequate duct supports for unrestricted air flow.
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Pinched duct.
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Collapsed duct.
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Torn flex duct outside liner.
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Sub trades disregard for the duct system.
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Duct or fan blockage. Debris left in return air or fan
cabinet.
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Air leakage at furnace, cooling coil and plenums.
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Sheet rock return air plenums in garage areas not sealed air
tight.
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Fittings and plenums not insulated.
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Flex duct wrap pulled over wye fittings and taped.
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High external static pressure on supply fans.
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High static pressure through cooling coils.
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High static pressure through return air system.
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Inappropriate return air filter grille sizing.
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Inadequate filtration (Manufacturers recommend a minimum of 2
cfm per square inch of filter area).
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Condensate lines sloped for drainage.
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Lack of exhaust or adequate exhaust in moisture laden spaces.
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Pinched exhaust duct.
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Lack of air changes or means of proving an air change.
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Lack of makeup air for duct loss, exhaust and venting.
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Furnaces mounted on wood when most manufacturers recommend a
minimum of 1” clearance from combustibles.
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Wood placed in safety pans for cooling coil support where
wood could come into contact with moisture.
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General construction provisions of mechanical space for
equipment, duct access and routing, and air distribution points.
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Equipment installed in tight spaces, serviceability.
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Kinked refrigerant lines around equipment and at wall entry.
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Homeowner negligence and lack of maintaining HVAC equipment.
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Dirty or plugged filters.
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Systems turned off.
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