Yes, larger compressors make more noise.. BUT.. if you have a good brand of compressor.. it will be quiet..
I mean.. you can't hear my 1/20HP compressor.. My 1/4HP compressor.. Well I got that out of the garbage.. It makes a few odd noises.. but when the thing is running right.. it just makes a very low humming sound.
If you really want to shell the dollars out.. get a Danfoss or Tecumseh compressor.. You'll be happy with it.. just be careful.. if this is your first time with refrigeration I'd suggest just getting compressors from refrigerators or AC's that are out in the garbage.. most of the time the compressor works.. Atleast if you kill them.. it won't matter.. It'll give you something to practice with.
You might just find a compressor in the garbage that you really like.. and decide not to buy one.. Just my opinion.. Get a couple of them.. run them.. decide which ones you like from a noise stand point.. and which ones actually work.. and then build a system with them.. or build several systems.. heh
*there is a little set of electrical stuff that plugs into the 3 pins on the side of the compressor.. YOU NEED THAT.. it's the over load relay starter.. If you don't get nothing but the compressor.. You'll need to get an overload relay starter .. one that is for your HP compressor.. I got mine at a local "chop shop" appliance repair/sale place.. 5 bucks.. That is good cuz it's a nice one.. and anywhere else they would want 20-50 dollars for it..*
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