Hi there - we just had a 90k btu Lennox SLP98 with Icomfort Wifi installed. Very impressed thus far bit have a question about noise. Previous luxaire furnace was single speed and we ran blower all time. It was pretty loud but a low frequency white noise you get used to.
We keep the Lennox fan set to on and it blows a slow steady 600 cfm. Everything is so quiet in the house at this speed but the motor,makes a slight buzz/whine that I did not expect. It is faint but definitely noticeable since it isn't low freq. It seems to ramp up as the blower ramps up (I tried adjusting recirc cfm to 700 and 800 in comfort).
wondering if these high end motors do make some sound or should it be virtually silent?