This residential and light commercial product, which initially seemed to create expections of high consumer satisfaction, is still selling well; year-to-date shipments through June are reported to be up 10% over last year (see chart below). However, the product apparently still needs improvements in airflow design and installation to fulfill its earlier promise.
According to our respondents, some of these improvements need to come from manufacturers. Over the past few years, certain protective features, such as high- and low-pressure switches and airflow sensors, have been designed out, possibly to lower unit cost.