The thing I've noticed is that if you leave the recirc off for about 30 seconds or so, then turn it back on....the ambient noise level (fan noise etc etc) remains at the lower level.
I'm not sure as to why this is (but it works!), I'd guess it has something to do with the air system plumbing..and perhaps by turning off the R recirc (hence increasing the flow rate) it somehow reduces the amount backpressure or stagnant air in the system...and hence when you turn the R Recirc back on..it doesnt have to work quite as hard to maintain the massflow..and is quieter. But I'm guessing.
Anyone?
