For line voltage thermostats, there aren’t a whole lot of smart options. Besides the Mysa Smart Thermostat, there’s CaleoSinope, and now the latest entrant in the contest: Stelpro’s Maestro.

This blog will compare all the features of Mysa and Maestro. It will discuss smart integrations, learning features, connectivity, pricing, and virtually all other information that potential customers may need.

We also have a Guide to Smart Thermostats if you’re looking for a general comparison or don’t use Line Voltage heating.

Compatibility and Connectivity

Maestro has a unique (if complicated) set-up when it comes to smart thermostats. Because Line Voltage systems require a thermostat for every room or set of heaters, Maestro deals with this dilemma by requiring a central “Controller” thermostat that acts as a hub for any additional thermostats, which are actually a different model with slightly different features and capabilities. This comes to light when you install the devices: The main “Controller” is incompatible with 120V lines, only working with 208V or 240V lines. However, each “Slave” thermostat is compatible with 120V, 208V, or 240V lines. If your house only has 120V power, you can control “Slave” thermostats independently by using a Zigbee hub (at an additional cost).

Mysa has a simpler setup: each Mysa Smart Thermostat is exactly the same and can be controlled centrally by the Mysa smartphone app – no complicated “Controller” setup required. They are compatible with all sorts of voltage levels: 110V, 120V, 208V, 220V, and 240V.

Mysa uses four wires total: two wires that power the thermostat to heater circuit, one neutral wire that powers the thermostat directly, and one ground wire. Maestro requires a standard 2 wire setup.

Both Mysa and Maestro use embedded WiFi connectivity, which allows them to connect to your home’s internet network. We previously mentioned that Maestro uses a Zigbee hub – but this is only in the case that there isn’t a main “Controller” thermostat present.

Controlling Thermostats

Mysa has a mobile app available for both Android and iOS devices which allows you to control thermostats individually and group them into heating zones. Because Mysa Smart Thermostats are joined to your home’s WiFi network and connected with Mysa’s cloud service, you can control your thermostats on your mobile device from anywhere in the world. You can also control Mysa manually from the two touch buttons on the faceplate. Mysa’s sleek design means that there aren’t any complicated screens to navigate – everything is done through the app.

Much like Mysa, Maestro also uses a mobile app as a central way to control the thermostats, coordinate schedules, and access more advanced features. There are native Android and iOS apps available. Maestro also has a touchscreen on the device to allow for hands-on control.


Mysa natively integrates with a wide range of smart home hubs and assistants, such as Amazon AlexaApple HomeKitGoogle Home, and, in the future, IFTTT and SmartThings. Mysa Smart Thermostats are the only high voltage thermostats that integrate with Apple HomeKit.

Maestro does not have any native integrations with the three most popular voice assistants. However, it does support Samsung SmartThings.

Smart Features

The Mysa Smart Thermostat will use machine learning to refine your preferences and schedules over time. The Mysa app will provide suggestions to improve your schedules and save more energy. Mysa will also learn how long it takes for the room to heat up to the temperature of choice and will ensure the rooms in your home are comfortably warm exactly when you want them. For a detailed overview of the features of this smart thermostat, see this article.

Out of all the Mysa alternatives on the market, Maestro covers the most ground with its slate of features. While it doesn’t have dynamic learning for the optimization of your heating schedules, it does have the ability to adjust scheduled starts based on the forecast. Like Mysa, it comes with features like zoning, geofencing, and energy use reports.


Mysa Smart Thermostats start at $125 and buying more means package deals. You can find out more and order here.

For Maestro, the initial “Controller” thermostat retails at $200, and every additional “Slave” thermostat runs $100.