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A technical guide and community resource for building the AYG Cool Bed, an open-source DIY mattress cooling system.

The Cool Bed is a simple, inexpensive, open-source water-based bed cooling system that uses frozen ice packs instead of active refrigeration.

The advantages of Cool Bed are

  • Runs entirely locally — no subscriptions, cloud accounts, or vendor lock-in.
  • Fanless operation — quiet, with no heatsinks or fans collecting dust.
  • Temperature-controlled — maintains a comfortable water temperature instead of simply circulating cold water.
  • Uses frozen ice packs — simple, inexpensive, and energy-efficient.
  • Environmentally friendly — low energy usage compared to an AC.
  • No evaporative cooling — doesn’t increase room humidity or expose the coolant to room air.
  • Built from readily available components — inexpensive, repairable, and easy to modify.
  • Closed-loop water system — minimizes contamination from dust and dirt.
  • Built-in Wi-Fi — no proprietary hub required.
  • Multiple control options — use the built-in web interface, Home Assistant, or MQTT.

Diagram

Start by understanding what parts you need to build the Cool Bed. Then build the hardware, install the software and participate in the community.

For additional project information and resources, visit: AYG Cool Bed

Contributing

If you'd like to contribute, please share your suggestions, corrections, and findings in the project's Discussions.