Ryan Homes is building a bunch of homes nearby. The basement
walls are poured concrete and the AC compressor is supported
by a hefty bracket bolted to the wall - a foot or so above grade.
Why are they doing this instead of putting the compressor on
the ground? It seems to me that a lot of noise gets coupled
into the house when it's done this way, plus cost of bracket
and mounting labor. What am I missing?
I see quite a few installed like that in my neighborhood specially where
yard is sloping. Off the ground, less chance of bugs getting inside?
I am sure they are mounted with rubber bumpers to minimize noise.
Ours is on the ground level with a soft concrete pad came with the unit.
It is low noise unit, hardly any noise or vibration.
It is sort of concrete with some kind of shredded fiber mixed in.
Made to dampen vibration/noise. Our unit is Carrier and
unit came with it. I am not sure whether it was supplied by Carrier
or the installer.
That seems to be the 'norm' today.
I suspect that it reduces call backs from the "slab" (or whatever the AC is
sitting on) shifting in the "builder's soil."
Well, one advantage is that they have a very accurate idea of the required
length of the "tube set" and don't have to worry about how much or how
little soil was placed back next to the foundation. In fact, it permits
them to install the A/C even when the foundation is completely exposed.
That's flexibility likely compensates for the marginally greater cost of the
I have not had any problem with this setup on my current home.
Little sound and vibration come into the home. I might add that if it
is not properly installed, it can transmit a fair amount of noise and
vibration however. I had to do a little adjusting to tune it out.
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