re: I have a beep in the house. It is a threat to my sanity.

I inspected a house for a Real Estate Company. Last thing she said was "Find the ghost" 4 million dollar unfinished home. I carry a ghost chaser in my car. I took it with me. Turn this sucker on and shadows are chased from every corner in a room. I walked in "Bump" set my watch five minutes..six, four, one....no rhythm to the sound ....nothing on the top two floors. Walked into the basement....turned the corner and looked into a pitch black room. "BUMP" turned on the light and set it at the door. The entire security system was in the room. All the home theater equipment ......Bump. Denon Home Theater had graphics on the display panel ...."BUMP"
I figured out that a power surge had damaged the receiver. Turned that off and the ghost disappeared ...
Disconnect everything electronic, then start plugging it back in one at a time ....

If you’re sure it’s not a smoke detector, check any power strips/surge protectors you have. I have one that chirps like two times a second if it stays on for longer than a couple days.

Perhaps a universal backup power supply for a computer or like somebody else said surge protector or power brick

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It's your electric razor or electric toothbrush.

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Good call. I unplugged the razor charger. Let's see what happens.

I had a similar issue before- ended up being a smoke detector attached to an old security system in my crawl space. The prior owner had done that set up, I have never used/had the security system.

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My bedroom tv comes on randomly between 3-5am almost every morning. I’ve tried everything, it has no external inputs, reset factory settings, and turned off any timers. It’s not even every morning and it’s not the exact same time.

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You have a poltergeist. Sorry baw

You may have a road runner trapped in your house. Acme has supplies that help deal with the issue.

I'll put a non-comprehensive list of some things to check, it's amazing the things that may beep for low batteries or error conditions.

Good luck

Smoke/gas detectors
Computers
Modems
Network switches
Routers
Soundbars
TVs
Garage Door Openers
Security cameras/NVRs
Treadmills/exercise equipment with electronic displays/controls

It is probably the transmitter in your covid fax. Put your ear closer to your shoulder