The problem is coming from the heat pump from the house next door, not ours. When our air handler is on, the noise is actually diminished a little and is less objectionable.
Our air handler is in the garage. In the model (Iris) that we have the kitchen, great room and dining room is one big room and the return air grille is in the ceiling about 25 feet from the kitchen table. Under that return air grille is one of the least noisy places in the house.
I don't know about all areas, but everthing new that we saw for sale in Bonita was all electric with heat pumps.
I crawled up into the attic today to look at the insulation depth. We are supposed to have 11 3/4 inches of fiberglass. In some places there is more than 11 3/4 inches and in a few places only two or three inches and in a few small areas no insulation at all. There are also a few vertical walls in the attic where there is no insulation or fiberglass bats that have pulled away. So maybe the problem is lack of insulation since from what I am reading fiberglass insulation is supposed to be a pretty good sound barrier.
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