Buildings · Strong theory
OpenEnvelope: Window/Door State & Energy-Bleed Alarm
Knows which windows and doors are open — and when you're heating the parking lot.
The physics is solid; our own validation is scheduled.
How it works
An open window or propped door rewires how WiFi waves travel: a reflecting pane of glass is suddenly an open corridor for the signal. That switch is clean and repeatable, so the system reads open or closed reliably. Cross-checked with HVAC runtime, it shows exactly where conditioned air is escaping.
In the physics: An open aperture radically rewires multipath: glass (eps_r~6, partially reflective) vs open air removes a reflection path and opens a low-loss transmission corridor, shifting specific CIR tap delays/amplitudes in a binary, repeatable way; a swinging door also gives a transient Doppler burst that timestamps the event.
See it work
This is real pipeline output for Buildings, replayed. The exact reading depends on your room.
Go deeper
How the field becomes an answer
How we prove it
Own-hardware: cycle windows/doors in an ESP32-meshed office, measure per-aperture classification accuracy and hold-time reliability; ESP32-wall for aperture-vs-wall propagation contrast.
Who it is for
For the building operations / sustainability manager: 'Every window and door reports its own state through the WiFi — stop conditioning outdoor air and know which fire door is propped at 2am.'
The matching solution
Complete first-room estimateFloor Utilization Node3 nodes · ~$130 parts · 90 min Request kit, subscribe, or set up →Compatible DIY hardware options
120 min · advanced
240 min · installer