You need to first check that there is a proper ground for the electrical system in your new house. A little two-dollar tester will be enough. Different electrical outlets frequently have a different ground reference value. Plug into one plug. Turn off your cell phone. Turn off the lights. Turn off electrical appliances one by one.

Record just the ambient noise to see what you can hear. I can hear my wife talking on the phone downstairs out in the backyard with the door closed.

I am not sure what you are recording. Guitar DI? Microphone? The lowest string on a four-string bass guitar is around 40Hz. Few people can hear above 20K Hz.

Here is a small amount of info you can read https://www.soundonsound.com/forum/viewtopic.php?f=15&t=64533&start=0.

What sort of floor do you have? Hard or carpet? The high-frequency noise is likely coming from electronics equipment such as a computer monitor.

I have to turn off my AC to record. I have to send my wife to the mall...lol

Billy

New location, new environment, new music coming soon

Seize the moo-ment
If you feel like you’ve herd all these cow puns before, you probably have deja-moo