Serin Labs Blog
Comparisons and how-tos for controlling Mitsubishi heat pumps locally: ESPHome, Apple Home, Home Assistant, and the CN105 port. No cloud required.
Garage doors have ratgdo, Panasonic has HeishaMon, Mitsubishi has CN105. The same pattern keeps recurring, and the same things keep breaking it.
Sensibo and Cielo drive a Mitsubishi mini-split blind: infrared is one-way, so the app's state is a guess it maintains. What that breaks, and when IR is still the right buy.
No mini-split ships with HomeKit. Here's how to add it anyway: which brands can do it, what hardware you need, and the five-step setup.
The model checker said no. What that verdict means on MSZ-FD, MSZ-HE, MSZ-A and MS-WA, why a connector you can see doesn't overturn it, and the IR controller to buy instead.
Browser flashing an ESP32 over Web Serial and nothing shows up? The five causes in order of likelihood: charge-only cable, browser, driver, bootloader, held port.
Every indoor unit on a multi-zone Mitsubishi has its own CN105 port, so every head needs its own board. Per-zone costs, naming, and what the outdoor unit still decides.
A recovery decision tree for a CN105 controller that won't boot: the fallback hotspot, crash-loop safe mode, OTA rollback, and USB as the last resort.
Trane and American Standard ductless heads are Mitsubishi Electric hardware with the same CN105 port. The model-number cross-reference, and what local control costs.
Nest and ecobee don't work on mini-splits. What does: Mitsubishi's MHK2 and Kumo, IR controllers like Sensibo, Cielo, and Mysa, and local CN105 control — compared with prices.
Mitsubishi mini-splits sense return air at the ceiling, not where you sit. How to add a remote temperature sensor for ~$15 with ESPHome or a BLE thermometer.
Mitsubishi's own Wi-Fi adapter, wall controllers like the MHK2, universal IR controllers like Sensibo and Cielo, and local CN105 control: prices, tradeoffs, and which to buy.
Mitsubishi mini-splits don't support Apple Home natively. Three ways to add HomeKit + Siri: CN105 firmware, HA's HomeKit Bridge, or Homebridge.
Mitsubishi's MHK2 and PAC-SDW01RC-1 wall controllers cost $180–$400. Here's a local alternative that adds app, Siri, and Home Assistant control for far less.
How to tell if your Mitsubishi has a CN105 port before you buy any local-control hardware: the Kumo Cloud proxy, the model-number check, and a look inside.
A Kumo Cloud alternative for Mitsubishi mini-splits: local control over the CN105 port with open-source firmware. No account, no cloud, no fees.
ESPHome vs HomeKit for a Mitsubishi mini-split: compare local control, Apple Home vs Home Assistant, remote access, and setup to pick the right firmware.
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