serin labs
How to Add a Mitsubishi Mini-Split to Samsung SmartThings
Add a compatible Mitsubishi mini-split to Samsung SmartThings through Matter. Check hub requirements, pair the CN105 controller, and understand the thermostat's limits.
Serin Labs Blog
Local Mitsubishi Mini-Split Guides
Comparisons and how-tos for controlling Mitsubishi heat pumps locally: ESPHome, Apple Home, Home Assistant, and the CN105 port. No cloud required.
Latest
Mini-Split Dry Mode, Explained: What It Does and When to Use It
What dry mode actually does on a Mitsubishi mini-split, quoted from the operating manual: it dehumidifies, cools the room slightly, and won't let you set a temperature. When it beats cool mode, and when it doesn't.
2026
Is It Cheaper to Leave a Mini-Split On All Day?
Inverter heat pumps are most efficient at low speed, which changes the leave-it-on question. What published lab and program guidance actually says, and a decision rule by how long you're gone.
Kumo Cloud Not Working? Five-Minute Triage, Then a Decision
Kumo Cloud offline, stuck loading, or refusing your login? Triage in likelihood order — the Comfort app migration, local control, the Signal screen, adapter LEDs, router settings — sourced from Mitsubishi's own manual.
Mitsubishi Model Numbers, Decoded: MSZ, MSY, GL, FS, FH, and the Letters That Matter
What every part of a Mitsubishi mini-split model number means, decoded from Mitsubishi's own reference guides — plus the letters they never published a key for.
How to Add a Mitsubishi Mini-Split to Alexa
Two working routes from a Mitsubishi mini-split to Alexa: a $35 CN105 controller paired through an Echo, or ESPHome through Home Assistant. Which Echo models qualify, and what the Alexa app can control.
Can a Nest or ecobee Run a Mitsubishi Mini-Split? Yes — Here's What It Costs You
Mitsubishi's Thermostat Interface (PAC-US444CN-1, PAC-US445CN-1, PAC-US446CN-1) lands R/C/G/W1/Y1 on CN105 so a Nest or ecobee can drive a mini-split. What the manual says you keep, and what you give up.
How to Add a Mitsubishi Mini-Split to Google Home
Add a compatible Mitsubishi mini-split to Google Home as a thermostat. Compare the direct $35 controller route with ESPHome through Home Assistant.
Every Way to Get a Mitsubishi Mini-Split into Home Assistant
Four real routes from a Mitsubishi mini-split to a Home Assistant climate entity: the HACS Kumo integration, the built-in MELCloud integration, CN105 with ESPHome, and the beta firmware. Verified status, setup effort, and what breaks.
Your Mitsubishi Is Blinking. Here's How to Read It.
What a blinking light on a Mitsubishi mini-split actually means, with blink counts and error codes traced to named Mitsubishi service manuals — and when to stop and call a technician.
ratgdo, HeishaMon, and the Case for Controlling Your Own Appliances
Garage doors have ratgdo, Panasonic has HeishaMon, Mitsubishi has CN105. The same pattern keeps recurring, and the same things keep breaking it.
Why IR Smart Controllers Fall Short on Mitsubishi (and When They're Still Right)
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.
How to Control Your Mini-Split with Apple HomeKit in 2026
Add a Mitsubishi-family mini-split to Apple Home and Siri. Check compatibility, see what you need, and follow the 20-minute setup.
Your Mitsubishi Doesn't Have a Usable CN105 Port. Here's What Still Works.
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 Failed? The Five Things It Usually Is
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.
Making a Multi-Zone Mitsubishi System Smart: One Board Per Head
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.
When It Won't Boot: Recovery Wi-Fi, Safe Mode, and Wireless Updates
A recovery decision tree for a CN105 controller that will not boot: the backup setup network, crash-loop safe mode, wireless update rollback, and USB recovery.
Trane and American Standard Ductless: Same Unit, Different Badge
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.
The Best Smart Thermostat for a Mini-Split (2026)
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.
Your Mitsubishi Mini-Split Reads the Wrong Temperature. Here's the Fix.
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.
Every Way to Make a Mitsubishi Mini-Split Smart, Compared (2026)
Compare four ways to make a Mitsubishi mini-split smart: prices, installation, apps, cloud requirements, and the best choice for your home.
Add Your Mitsubishi Mini-Split to Apple Home (HomeKit + Siri)
Mitsubishi mini-splits don't support Apple Home natively. Three ways to add HomeKit + Siri: CN105 firmware, HA's HomeKit Bridge, or Homebridge.
Cheaper Alternative to the Mitsubishi MHK2 Wall Controller
Mitsubishi's MHK2 and PAC-SDW01RC-1 wall controllers cost hundreds of dollars per room. Here's a local alternative that adds app, Siri, and Home Assistant control for far less.
Does Your Mitsubishi Have a CN105 Port? How to Check
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.
The Best Kumo Cloud Alternative for Local Mitsubishi Control
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 (Apple Home) for a Mitsubishi Mini-Split
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.