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Air Infiltration  Estimation Table

following table will give you a rough idea of what your home's air infiltration rate might be and what you might expect after receiving a complete home tightening:

Home Condition ACPH*
Existing Home
Old very leaky home 1.00
Old moderately leaky home .75
Average home .50
Fairly tight home .45
Tightened Home
Average Tightening to Old Very Leaky Home .75
Average Tightening of Old Moderately Leaky Home .60
Average Tightening to Average Home .45
Blower Door Assisted Professional Sealing Job
(This is what E-Star certified energy raters do.)
.35
Blower Door Assisted Professional Extreme Tightening (E-Star certified energy raters can do this.) .25**
* Air Changes Per Hour is the amount of air inside your home that is replaced by outside air every hour.
** You probably don't want to lower your ACPH below .35 ACPH without adding a mechanical ventilation system to your home to bring in enough fresh air to maintain a healthy living environment. It is difficult to get your house to this level without professional help.

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Last Updated: 01/21/2007