Best Smart Thermostat for Mini Split 2026: 4 Options Compared

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The mini split in the bedroom is the best thing you did for the house: quiet, warm in winter, cool in summer. But the little remote keeps vanishing into the sofa, the unit runs all day while everyone’s at work, and you come home to a stuffy room because nobody remembered to switch it on. A mini split doesn’t have thermostat wires, so the smart thermostat on your hallway wall can’t help. A smart controller made for mini splits can.

The best smart thermostat for a mini split for most people is the Mysa Smart Thermostat for Mini-Split Heat Pumps: it replaces the remote with infrared, reads the room’s temperature and humidity, adds schedules and app control, and has no subscription. The Cielo Breez Max is the better choice for homes with several mini splits. Check first whether your unit has Wi-Fi from its own maker.

Below: how mini split controllers work, three controllers that work with most ductless units, the maker’s-own-Wi-Fi option, and how to check that your remote is compatible before you buy. We researched and compared them from the makers’ spec and help pages; we did not test them.

Prices change often. The prices below are what we saw at the maker or a major retailer in October 2026; check the current price before you buy.

Our top picks

Mini split smart controllers compared

Option	How it controls the unit	Sensors and screen	Works with	Subscription	About (Oct 2026)
Mysa for Mini-Splits	Infrared (replaces the remote)	Temp ±0.5°F, humidity ±2%; LED display, touch buttons	Mini splits, window and portable ACs with a full-display remote	None	$139
Cielo Breez Max	Infrared	Temp and humidity; color touchscreen	Mini split, window and portable ACs with IR remotes (300+ brands)	None required	$119-$130
Cielo Breez Lite	Infrared	Segment LCD; power button	Mini split, window and portable ACs	None required	Not stated
MRCOOL DIY 5th Gen	Built-in Wi-Fi (two-way)	Through the unit and app	That MRCOOL unit only	None stated	$2,158 (retailer sale, full system)

Why a normal smart thermostat won’t run a mini split

Central systems are switched by a wall thermostat over low-voltage wires: one wire calls for heat, another for cooling. Most ductless mini splits don’t work that way. Each indoor unit has its own control board and takes commands from a handheld infrared remote, much like a TV. That’s why an ecobee or Nest on the wall can’t simply be wired to it.

There are three ways to make a mini split smart:

• An infrared smart controller (Mysa, Cielo): sits on the wall where it can “see” the indoor unit and sends the same signals as your remote, with schedules, app control and a temperature sensor at room level.
• The maker’s own Wi-Fi: some units have it built in (MRCOOL’s 5th Gen DIY line, per MRCOOL), and many brands sell a Wi-Fi adapter that plugs into the indoor unit (Mitsubishi’s works with its Comfort app, formerly kumo cloud). This talks to the unit directly, both ways.
• A thermostat interface: some makers sell an adapter that lets a standard 24 V thermostat control an indoor unit, such as Mitsubishi’s PAC-US444CN-1. This is an installer job and needs a separate 24 V supply.

One thing to know about infrared: it’s one-way. Mysa explains that the unit sends no feedback, so if someone changes settings with the original remote, the controller won’t know, and the two can fall out of sync. Mysa’s advice is to stop using the old remote once the controller is set up. The controller also needs a clear line of sight to the indoor unit; Mysa gives a range of up to about 25 to 30 feet.

The best smart thermostats for mini splits

1. Mysa Smart Thermostat for Mini-Split Heat Pumps: best overall

Mysa says its mini split thermostat works with most ductless mini-split heat pumps, window air conditioners and portable ACs that use an infrared remote, naming brands such as Mitsubishi, Fujitsu, LG and Frigidaire. It learns your remote’s codes during setup, then runs heat, cool, dry, fan-only and auto modes, five fan speeds and, where the unit supports them, swing and vane position. The sensors are rated at ±0.5°F for temperature and ±2% for humidity, so the room is controlled by what the wall reads, not the unit’s own sensor up near the ceiling. It plugs into a standard outlet, connects over 2.4 GHz Wi-Fi, works with Apple HomeKit, Alexa and Google Assistant, and Mysa promises “no subscriptions here – ever.” Mysa lists it at $139 with a 5-year warranty.

• Good: works across many brands; HomeKit support (which Cielo lacks, per a reviewer); long warranty; free app with schedules and energy reports.
• Watch out: your remote must show the full state (set temperature, mode and fan speed) on its screen; Mysa doesn’t support some unit features such as freeze protection or low-temperature heat modes, “I-Feel/Follow Me,” turbo or sleep mode, and its setpoint range is 61 to 88°F.
• Best for: one or two mini splits, and Apple Home users.

Check the Mysa for Mini-Splits price on Amazon

2. Cielo Breez Max: best for several mini splits

Cielo’s top model has a full-color touchscreen, built-in temperature and humidity sensors and a proximity sensor that lights the screen as you walk up. Cielo says it works with any AC that has an infrared remote, across more than 300 brands, and detects your remote automatically. Its standout is multi-zone control, which prevents mode conflicts across several indoor units, plus Comfy Max (Cielo’s automatic comfort mode), geofencing, weekly schedules and Home/Sleep/Away presets. It runs from the included 5 V USB adapter or a 24 V connection, draws about 1.5 watts, and works with Alexa, Google Assistant, Samsung SmartThings, Siri Shortcuts and IFTTT. Manual controls work even without internet. Retailers list it at about $119 to $130.

• Good: real on-wall controls; built for homes with a mini split in every room; no subscription required.
• Watch out: one controller per indoor unit, so costs add up; no native Apple HomeKit (Siri Shortcuts only); Cielo’s “up to 25%” savings figure is the maker’s claim.
• Best for: multi-zone homes and rentals (Cielo lists a temperature range lock on its line).

Check the Cielo Breez Max price on Amazon

3. Cielo Breez Lite: best budget

The Breez Lite is Cielo’s basic model: a segment LCD, a power on/off button on the device and everything else in the app. Cielo says it works with tens of thousands of mini split, window and portable AC and heat pump models, and it brings the same weekly schedules, geofencing, Comfy Mode (it keeps the room in a range you choose), usage history and filter-cleaning alerts. Power is a 5 V adapter in the box or a 24 V connection. It works with Alexa, Google Assistant, Siri Shortcuts, SmartThings and IFTTT. Cielo didn’t show a current price on the pages we read, so check before you buy.

• Good: the core smart features at a lower price than the Max; no subscription required.
• Watch out: almost no controls on the device; no multi-zone conflict handling; no native HomeKit.
• Best for: one mini split or window unit where you’ll mostly use the phone.

Check the Cielo Breez Lite price on Amazon

4. MRCOOL DIY 5th Gen: smart built in, if you haven’t bought yet

If you’re still shopping for the mini split, the simplest smart controller is the one inside it. MRCOOL says its 5th Gen DIY units have built-in Wi-Fi, controlled with the SmartHVAC app (2.4 GHz network) and by Alexa or Google Assistant, alongside the included remote. The 12,000 BTU, 115 V model is rated 23.5 SEER2 and is ENERGY STAR certified; it comes with a 25-foot pre-charged line set, and MRCOOL’s warranty (7 years compressor, 5 years parts) allows homeowner installation. A retailer listed the full system at $2,158 on sale (regularly $2,891). Connecting it to your home’s power is a job for a licensed electrician, with a permit where required.

• Good: two-way control (the app knows what the unit is doing); nothing extra to buy; DIY-friendly warranty.
• Watch out: it’s a heat pump, not a thermostat purchase; the unit’s own sensor sits up on the wall, so room temperature can differ.
• Best for: anyone choosing a DIY mini split now. More in our best DIY mini splits guide.

Check the MRCOOL DIY 5th Gen price on Amazon

Already have a mini split from Mitsubishi, Daikin or another big brand?

Ask your installer about the maker’s own Wi-Fi adapter before buying an infrared controller. Mitsubishi Electric, for example, sells a Wi-Fi interface for many indoor units that connects to its Comfort app (the replacement for kumo cloud), with schedules, fan and vane control and alerts. A maker adapter talks to the unit both ways, so there’s no sync problem, but it plugs into the indoor unit’s control board, and many brands’ warranties expect an authorized installer to do that. Infrared controllers need no wiring at all, which is why they’re the easiest route for most owners.

Do you have a ducted mini split or a mini split with a wired wall controller instead of a remote? Infrared controllers won’t help there. Check the maker’s options with your installer; some brands support a standard thermostat through an interface. And ENERGY STAR notes that variable-capacity heat pumps, which most mini splits are, generally perform best with the thermostat the manufacturer recommends.

How to choose a smart thermostat for a mini split

• Check the remote first. Mysa requires a remote whose screen shows set temperature, mode and fan speed together; remotes with buttons only or with a temperature-only display aren’t compatible. Use the maker’s online compatibility checker with your remote’s model number.
• Plan where it goes. It needs a clear line of sight to the indoor unit, a nearby outlet (or a 24 V supply for Cielo), and a spot on an inside wall away from sun and drafts so it reads the room fairly.
• Count your indoor units. Each infrared controller runs one indoor unit. With three or more, Cielo’s multi-zone conflict handling helps; with one or two, Mysa is simpler.
• Match your smart home. Apple Home users: Mysa supports HomeKit. Alexa or Google: both brands work.
• Keep the unit’s cold-weather features in mind. If you rely on a low-temperature “freeze protection” mode in a cabin or garage, check that your controller supports it; Mysa says it doesn’t, and Cielo lists freeze protection on some models.

Savings depend on use. The biggest wins are simple: the unit no longer runs in empty rooms, and schedules warm or cool rooms before you arrive. The makers’ figures (Cielo’s “up to 25%,” Mysa’s own customer estimates) are claims, not independent tests; ENERGY STAR’s independent average for certified central smart thermostats is about 8% of heating and cooling bills, and we didn’t find Mysa for Mini-Splits or the Cielo Breez Max or Lite on ENERGY STAR’s smart thermostat list.

Keep exploring: our smart thermostats hub and heat pumps hub, the best DIY mini splits, the best smart thermostat for a heat pump (for ducted systems), and the best smart thermostat without a subscription. Learn how heat pumps move heat in thermal energy, or browse Smart Thermostats.

Mini split thermostat questions

Can I use an ecobee or Nest with a mini split?

Not directly with most ductless units, because they’re controlled by infrared remotes, not thermostat wires. Some brands sell an interface that lets a standard 24 V thermostat control an indoor unit (Mitsubishi’s PAC-US444CN-1 is one), installed by a pro. For most owners, an infrared controller like Mysa or Cielo is simpler.

Do mini split smart thermostats need a subscription?

No for the ones here. Mysa says there are no subscriptions, ever, and Cielo’s app works without one. MRCOOL’s SmartHVAC app comes with its Wi-Fi units. See our no-subscription thermostat guide.

Can I still use my mini split remote?

You can, but it’s best not to. Infrared is one-way, so the controller can’t tell when the remote changed something, and the two get out of sync. Mysa recommends putting the original remote away once its thermostat is set up, and using the app or the wall unit instead.

Do I need one controller for each indoor unit?

Yes. Each infrared controller has to see one indoor unit’s receiver, so a three-zone system needs three. Cielo’s Breez Max adds multi-zone conflict handling so units don’t fight each other in heat and cool modes.

Will a smart controller void my mini split warranty?

An infrared controller doesn’t connect to the unit at all; it just sends remote signals, so there’s nothing to install inside it. Wired adapters and thermostat interfaces are different: they connect to the unit’s control board, so follow the maker’s instructions and use an authorized installer if the warranty requires it.