Re: Mysterious noise

[Tara Stabie]

additional info:

What it is NOT

• ❌ Not a visible smoke detector

• ❌ Not a visible CO detector

• ❌ Not hardwired electrical equipment

• ❌ Not HVAC noise or expansion sounds

• ❌ Not anything the electrician could identify

Strong remaining possibilities

• ⚠️ Hidden battery-powered smoke or CO alarm

• ⚠️ Duct-mounted detector above a vent

• ⚠️ Forgotten / abandoned alarm from original construction (2019 build)

• ⚠️ Sealed-battery alarm that cannot be silenced without removal

Tara

On Mon, Feb 9, 2026 at 3:49 PM Tara Stabie <tst...@gmail.com> wrote:

Hi, hoping someone can help with a mysterious noise in my home. There’s a device in my ceiling (sounds like that) that chirps once an hour. Not fire alarms have been down that rabbit hole. It seems to be transmitting a signal. Could someone help locate it using RF direction-finding techniques? Believe it is an abandoned fire alarm -but no luck with other experts locating it. Thinking out of the box now. It only chirps at night and not every hour - it's periodic.

Electrical & ADT

• ✅ Confirmed it is NOT an ADT control box

• ✅ ADT confirmed system is not monitored

• ✅ Turned off breakers — chirping continued

• ✅ Electrician checked and ruled out:

  • Wired smoke alarms ( even removed them all and bought new ones)

  • CO detectors

  • Electrical panels

  • Any visible powered alarm devices

Attic & Ceiling

• ✅ Handyman searched attic — no alarm found

• ✅ Searched insulation manually — no device located

• ✅ Chirp seems to come from ceiling area

• ✅ Sound appears strongest near / under a vent

Behavior of the Chirp (important clues)

• 🔊 Chirps about once an hour, not exactly on the hour

• 🌙 Noticeable at night

• 🌡️ Stops or reduces when the attic is warmed

• ❄️ Returns when the attic cools again

Tara

[Tara Stabie]