I have a working furnace
It was a commedy of errors, losing bits, finding bits, losing them again but it is in and working. The G type copper tube is much much thicker than the home depot variety so I am glad I waited untill I had the right type.
I like the hairdryer analogy for sound and volume of hot air. It is not silent by any means but I don't think it will be objectionable in the least. The only other furnace
I have ever used was in my first Trillium
20 years ago and it had no blower. Nice and quiet....except when it cycled off and cooled down, there was always a few very loud bangs as parts shrank in size.