A house with no type of heating or
cooling equipment will become dirty over time.
A house with a normal properly
operating central A/C system will give about the same results.
A house with a properly operating
central A/C system and an upgraded air cleaner will result in much less dirt accumulation.
A house with an imbalanced A/C duct
system and any kind of air cleaner can result in a dramatic increase in the amount of dust
accumulation in the house.
The duct system itself, rather than the
air filter has the greatest impact on the amount of dust that enters the house.
Leaks in the return duct system will
actually suck in dirt through the duct while your unit runs.
Leaks in the supply duct system will
cause your entire house to have negative pressure while the unit runs, and thus suck in
dirty air from outside.
Imbalance in the design of the duct
system can give the same results.
Carefull analysis with equipment such
as the infiltrometer, duct blaster, and magnehelic guage, as well as a visual inspection
by a skilled technician are the methods we use to identify the above problems.