Pipes help?

Question

Something in my house is like whisteling. Almost like the toilet after it flushes. What is it. Its getting annoying??!

Answer 1

another thought is it may be your pressure regulator.  check your house pressure and listen to the regulator while someone flushes the toilet.

Answer 2

check all your windows and door are shut with no air gettin through the cracks.

Answer 3

Your hot water tank may be getting hot and the pop off valve is releasing steam or hot water out through the value. Check it........Also if you have a real air tight house you may want to open a window 1'' or so............try it and see.......good luck.