A recent home that we tested showed a mediocre ACH50 number of 7.1. For a 1965 rancher with no updates, this isn't a bad result; it's not a great one either as new home construction in Maryland requires 3ACH50 or less. But for the existing building, it's not as bad as some of the others we've tested with similar construction.

Remember the customer with the rim joist issues? Well after some discussion and a little elbow grease, progress has been made. The great part about being asked to return and share the progress shows that the customer really cares about their home energy consumption and comfort.