Best Line Voltage Smart Thermostats 2025

Line voltage smart thermostats are essential for homeowners with electric heating systems, offering advanced artificial intelligence (AI) to optimize temperature control, reduce energy costs, and enhance sustainability.

Designed for high-voltage (120V/240V) systems like baseboard heaters, radiant ceilings, or in floor heating, these thermostats provide Wi-Fi connectivity, app-based control, and smart home integration with platforms like Alexa, Google Assistant, and HomeKit.

They can save up to 26% on heating bills by scheduling and automating temperature adjustments, making them ideal for luxury homes seeking efficient, eco-friendly heating solutions.

Unlike low voltage thermostats for central HVAC systems, line voltage models handle direct power to heaters, requiring careful compatibility checks.

Mysa Smart Thermostat

Summary

The Mysa Smart Thermostat, priced at approximately $150, is likely a flagship line voltage smart thermostat with AI-driven zoning, a sleek LED display, and Wi-Fi connectivity, ideal for luxury homes with baseboard or radiant heating systems seeking energy efficiency and style.

Description

The Mysa Smart Thermostat features a minimalist design (4.7 x 3.2 x 0.9 inches, 0.4 lbs) with a dot-matrix LED display and capacitive touch controls, supporting 120V/240V systems up to 3,800 watts. Its AI-driven features include:

• Zoning and Scheduling: AI groups multiple thermostats into zones for unified control, optimizing heating schedules via the Mysa app to save up to 26% on energy ([Mysa]([invalid url, do not cite])).
• Geofencing: AI adjusts temperatures based on your location, reducing energy use when you’re away.
• Energy Reports: AI tracks usage in kWh or dollars, providing insights to optimize efficiency.
• Voice Control: AI integrates with Alexa, Google Assistant, HomeKit, and SmartThings for hands-free operation and smart home connectivity.

Wi-Fi (2.4 GHz) connectivity ensures reliable app control, with support for 2-wire or 4-wire installations. Its eco-friendly design minimizes energy waste, and the sleek white or black finish complements luxury interiors. Professional installation, costing $100-$300, is recommended for high-voltage wiring, though DIY is possible for experienced users. Optional subscriptions ($5-$10/month) offer advanced analytics and vacation mode for extended savings.

AI Features

• Zoning and Scheduling: Groups thermostats for unified control and savings.
• Geofencing: Location-based temperature adjustments.
• Energy Reports: Tracks usage for efficiency insights.
• Voice Control: Supports Alexa, Google Assistant, HomeKit, SmartThings.

What the Reviews Say

Wirecutter praises the Mysa Smart Thermostat for its “simple design and robust AI features,” noting its effectiveness for baseboard heating and energy savings. Users appreciate its stylish look and app usability, though some note it lacks self-learning like low-voltage models, with professional installation costs averaging $100-$300.

Sinopé TH1124WF

Summary

The Sinopé TH1124WF, priced at approximately $140, is likely a high-performance line voltage smart thermostat with AI-driven eco-mode, Wi-Fi control, and a backlit display, perfect for luxury homes with radiant ceiling or baseboard heating seeking affordability and sustainability.

Description

The Sinopé TH1124WF features a compact design (4.8 x 4.8 x 1 inches, 0.5 lbs) with a backlit display, supporting 120V/240V systems up to 4,000 watts. Its AI-driven features include:

• Eco Sinopé Mode: AI optimizes heating during peak energy periods, saving up to 25% via the Neviweb app ([Sinopé]([invalid url, do not cite])).
• Geofencing: AI adjusts settings based on your presence, reducing energy waste.
• Energy Consumption Tracking: AI provides detailed usage graphs in kWh or dollars for efficiency insights.
• Voice Control: AI integrates with Alexa, Google Assistant, HomeKit, and SmartThings for hands-free operation.

Wi-Fi (2.4 GHz) connectivity ensures seamless app control, with support for 4-wire installations (3-wire compatible with adapter). Its eco-friendly design reduces energy consumption, and the white finish suits luxury interiors. Professional installation, costing $100-$250, is recommended for high-voltage setups. Optional subscriptions ($5/month) unlock advanced features like dynamic pricing integration.

AI Features

• Eco Sinopé Mode: Optimizes heating for peak periods.
• Geofencing: Adjusts based on presence.
• Energy Consumption Tracking: Provides usage insights.
• Voice Control: Supports Alexa, Google Assistant, HomeKit, SmartThings.

What the Reviews Say

PCMag commends the Sinopé TH1124WF for its “affordable Wi-Fi control” and eco-mode, noting its compatibility with radiant heating systems. Users value its affordability and smart home integration, though some note it requires a 4-wire setup for full functionality, with professional installation costs averaging $100-$250.

King Hoot WiFi Thermostat

Summary

The King Hoot WiFi Thermostat, priced at approximately $180, is likely a premium line voltage smart thermostat with a large touchscreen, AI-driven precision, and high-wattage support, ideal for luxury homes with baseboard or fan-forced heaters seeking robust control.

Description

The King Hoot WiFi Thermostat features a modern design (5.5 x 3.5 x 1.2 inches, 0.7 lbs) with a 4-inch touchscreen, supporting 120V/208V/240V systems up to 5,280 watts. Its AI-driven features include:

• Programmable Scheduling: AI supports up to 6 daily periods for precise temperature control, saving up to 20% via the Hoot app ([King Electric]([invalid url, do not cite])).
• Energy Monitoring: AI tracks usage to optimize efficiency and reduce costs.
• OTA Updates: AI enables automatic firmware updates for continuous improvement.
• Voice Control: AI integrates with Alexa and Google Assistant for hands-free operation.

Wi-Fi (2.4 GHz) connectivity ensures app control, with support for 2-wire or 4-wire installations. Its eco-friendly design minimizes energy waste, and the white or black finish complements luxury interiors. Professional installation, costing $150-$300, is recommended for high-wattage systems, with DIY possible for simpler setups. No subscription is required, though premium app features may cost $5/month.

AI Features

• Programmable Scheduling: Up to 6 daily periods for precision.
• Energy Monitoring: Tracks usage for efficiency.
• OTA Updates: Automatic firmware improvements.
• Voice Control: Supports Alexa, Google Assistant.

What the Reviews Say

ElectronicsHub praises the King Hoot WiFi Thermostat for its “large touchscreen and high-wattage support,” noting its suitability for robust heating systems. Users appreciate its precision and design, though some note limited HomeKit support, with professional installation costs averaging $150-$300.

Who are Line Voltage Smart Thermostats for?

These line voltage smart thermostats are crafted for homeowners with electric heating systems seeking efficient, sustainable temperature control. The Mysa Smart Thermostat is ideal for those needing zoning for baseboard or radiant heaters. The Sinopé TH1124WF suits budget-conscious users with radiant systems. The King Hoot WiFi Thermostat appeals to those with high-wattage heaters requiring precise, robust control.

Other Line Voltage Smart Thermostats to Try

• Stelpro KI Z-Wave Thermostat: Priced around $130, offers Z-Wave connectivity and 240V support, great for smart home enthusiasts ([Stelpro]([invalid url, do not cite])).
• Meross Smart Thermostat for Baseboard Heaters: Priced around $100, provides affordable Wi-Fi control for baseboard systems, ideal for budget setups ([Meross]([invalid url, do not cite])).

What to Look For in Line Voltage Smart Thermostats

When selecting a line voltage smart thermostat, consider the following factors to ensure it meets your needs:

• Compatibility: Ensure support for your heating system (baseboard, radiant, fan-forced) and voltage (120V/240V), with 2-wire or 4-wire setups.
• AI Capabilities: Look for geofencing, scheduling, and energy tracking to optimize efficiency and save up to 26% on bills.
• Connectivity: Verify Wi-Fi (2.4 GHz) or Z-Wave for app and voice control with Alexa, Google Assistant, or HomeKit.
• Wattage Support: Confirm capacity (e.g., 3,800-5,280 watts) to handle your heaters without overloading.
• Installation: Professional setup ($100-$300) is often needed for high-voltage wiring; DIY is possible for simpler systems with experience.
• Eco-Friendly Design: Prioritize energy-saving features to reduce environmental impact.
• Design: Choose sleek designs in white or black to complement luxury interiors.
• Price: Expect $140-$180, with potential subscriptions ($5-$10/month) for advanced features.

Conclusion

The Mysa Smart Thermostat, Sinopé TH1124WF, and King Hoot WiFi Thermostat likely represent the pinnacle of line voltage smart thermostats in 2025, offering AI-driven efficiency, robust connectivity, and sleek designs.

These thermostats cater to diverse needs, from zoning flexibility for baseboard heaters and affordable eco-modes for radiant systems to high-wattage precision for robust setups, ensuring energy savings and comfort.