the airconditionear is older and sits on a cement pad, how can i make it quieter, it humms loudly?
Answers:
I use to work on ac units. Basically outside of a loose panel on the unit there is little you can do. The noise you are hearing is the combination of the fan and the compressor (the engine that pumps the Freon around). Trying to add insulation to deaden the sound might cause some pretty expensive repairs later on. But I am not the ultimate expert, call a ac technician; don't be surprised if they send out a salesman to push their newest unit (that might be the solution though).
Other answers:
can you pad it somehow? Foam or even blankets wrapped in plastic to help with weatherproofing?
can you pad it somehow? Foam or even blankets wrapped in plastic to help with weatherproofing?
mount it rubber insulation or where ever contact surfaces meet at to the foundation
It depends on where the humming is comming from. Make sure all nuts\bolts\screws are tight. It could just be metal parts vibrating. If not, it could be comming from the fan motor or the compressor. You can try mounting either with rubber matting or rubber washers to dampen the sound (submarines employ this tactic) or you can replace the noisy parts with new ones.
Good luck!