LUX Smart Thermostats: 3 Picks Ranked by Specs

Quick picks

Our 3 picks

1 Best overall

LUX 5/2-Day Programmable Thermostat

Best for: basic single-stage HVAC scheduling

Programmability

5/2-day

System Stages

1 Heat / 1 Cool

Dimensions

5 × 3.25 × 1.5 inches

Weight

1 pounds

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The LUX PSP511LC is a traditional white thermostat designed for single-stage heating and cooling systems. It offers 5/2-day programmability with up to four scheduling periods per day for both heat and cool. You get precise temperature control between 45F and 90F. This model suits users who want straightforward daily scheduling without smart connectivity or complex multi-stage system support.

Pros

• 5/2-day programming for separate weekday and weekend schedules
• Flexible daily scheduling with up to four periods per day
• Separate heating and cooling program options
• Keyboard lockout for secure settings management

Cons

• Limited to single-stage heating and cooling systems
• No Wi-Fi or remote app control capabilities
• Not compatible with multi-stage heat pumps or line voltage systems

Good fit if

• You need simple 5/2-day scheduling for basic HVAC systems
• You prefer a traditional wall-mounted thermostat design
• You want separate programming for heating and cooling cycles

Skip if

• You require Wi-Fi connectivity or smartphone app control
• You have a multi-stage heat pump or complex furnace
• You need line voltage compatibility without a transformer

Verdict: LUX PSP511LC Traditional Programmable Thermostat fits users with basic single-stage systems who value straightforward daily scheduling over smart features.

2 Best budget

LUX Programmable Line Voltage Thermostat

Best for: basic line voltage electric heating control

System Compatibility

Line-Voltage, Heat-Only

Voltage

Line-Voltage

Programmability

5/2-Day

Dimensions

1.75 × 9.5 × 7.5 inches

Weight

1 pounds

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The LUX ELV4 is a traditional, white line voltage thermostat designed for electric heating systems. It features four daily program periods with separate weekday and weekend scheduling. You get a temporary override function for quick adjustments and front battery access with a low-battery indicator. This unit is UL approved and includes a positive off switch. It suits users needing basic programmable control for line voltage appliances without complex smart features.

Pros

• Four program periods per day for flexible scheduling
• Separate programming options for weekdays and weekends
• Temporary override function for quick adjustments
• Front battery access with low-battery indicator

Cons

• Not compatible with heating appliances containing both resistive and inductive loads
• Lacks smart connectivity or app control
• No remote sensor included

Good fit if

• You have a line voltage electric heating system
• You need simple weekday and weekend scheduling
• You prefer physical front battery access

Skip if

• You have a low-voltage HVAC system
• You want remote temperature sensing
• You need smartphone app control

Verdict: The LUX ELV4 Programmable Line Voltage Thermostat is a straightforward option for electric heating systems requiring basic scheduling. It fits users who want reliable, local control without smart home integration.

3 Best premium

LUX TQX Matter Smart Thermostat

Best for: Matter users with conventional or heat pump systems

System Compatibility

Conventional, heat pump, PTAC

Wiring Requirement

C-Wire

Smart Home Compatibility

Matter, Apple Home, Google Home, Alexa

Programmability

Occupancy learning

Connectivity

WiFi

Display Type

Intelligent display

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The LUX TQX is a small, black smart thermostat that connects via Matter to your existing smart-home speaker. It features millimeter-wave occupancy detection and supports up to five QSZ remote sensors for whole-house comfort. The display adjusts brightness automatically and turns off when the room is empty. It works with conventional, heat pump, and PTAC systems, but does not support line voltage setups.

Pros

• Matter connectivity for local and remote control via smart-home apps
• Supports up to five QSZ remote sensors for broader temperature data
• Millimeter-wave occupancy detection with intelligent display brightness adjustment
• Compatible with conventional, heat pump, and PTAC systems

Cons

• Not compatible with 120V/240V line voltage systems
• Remote sensors sold separately beyond the included occupancy sensor
• Individual sensors do not regulate rooms independently

Good fit if

• You already use a Matter-enabled smart-home ecosystem
• You need whole-house temperature data from multiple locations
• You have a conventional or heat pump system

Skip if

• You have 120V/240V line voltage heating or cooling
• You want individual room temperature control via separate sensors
• You prefer a thermostat with a built-in display that does not rely on smart-home integration

Verdict: LUX TQX Matter Thermostat with Remote Sensors is a solid choice for users with Matter-compatible hubs who need whole-house sensing. It suits conventional and heat pump systems but fails for line voltage installations.

Specifications side by side

LUX Smart Thermostats Overview

You can choose between traditional and small-sized units based on your HVAC system. The LUX PSP511LC suits basic single-stage heating and cooling needs. It measures 3.25 inches wide and weighs one pound. This white, programmable model fits users who want straightforward daily scheduling without smart features. It is a reliable option for conventional wiring setups.

For electric heating, the LUX ELV4 handles line voltage requirements. Its larger 9.5-inch width accommodates specific mounting needs. If you need smart home integration, the LUX TQX supports Matter connectivity. This black, small-sized unit includes remote sensors for whole-house sensing. It works with conventional and heat pump systems but is not suitable for line voltage installations.

Who LUX Thermostats Suit

LUX fits users who want simple, local control. The range spans traditional white units for single-stage HVAC and line voltage electric heating. You also have a small black option for Matter-compatible hubs. This model supports whole-house sensing but excludes line voltage systems. The lineup lacks large displays or complex smart home integration beyond Matter. If you need basic scheduling without app complexity, this brand covers your needs. It does not offer multi-stage system support or remote sensors for the traditional models. Choose based on your wiring type and desired size.

How to choose the right one

1. Check system stages

   Match the thermostat to your HVAC capacity. The LUX PSP511LC supports one heat and one cool stage. This suits basic single-stage systems. It does not handle complex multi-stage setups. Verify your system type before buying. Using a unit with insufficient stages can cause poor temperature control. Choose a model that matches your heating and cooling hardware exactly. This ensures reliable operation and prevents equipment strain during peak demand periods.

2. Verify line voltage needs

   Electric baseboard heaters require specific hardware. The LUX ELV4 handles line voltage electric heating. It is designed for direct 120-240V connections. Standard low-voltage thermostats will not work here. Check your existing wiring and heater type. If you have electric resistance heating, this model provides basic scheduling. It offers local control without smart integration. Confirm your system compatibility to avoid installation failures or damaged equipment.

3. Assess smart connectivity

   Connectivity dictates how you control the device. The LUX TQX uses the Matter protocol. This allows integration with compatible smart hubs. It suits users who want whole-house sensing. The unit includes remote sensors for better accuracy. It works with conventional and heat pump systems. It does not support line voltage installations. Choose this if you have a Matter ecosystem. Other models offer local control only. Select based on your existing smart home infrastructure.

4. Review programmability

   Scheduling flexibility affects daily comfort and efficiency. The LUX PSP511LC offers five-two-day programming. You can set different times for weekdays and weekends. The ELV4 also provides programmable features. This helps manage heating costs for electric systems. The TQX includes scheduling via its smart interface. Choose a model that fits your routine. Basic users may prefer simple daily patterns. Complex schedules require more advanced programming options. Ensure the thermostat matches your lifestyle needs.

5. Consider physical size

   Dimensions matter for wall plate fit. The PSP511LC measures 3.25 inches wide. It is a traditional size for standard boxes. The TQX is smaller at 3.5 inches square. It fits compact spaces or modern aesthetics. The ELV4 is larger at 9.5 inches wide. This suits specific electric heater mounting needs. Check your existing wall space before purchasing. Ensure the new unit fits your installation area. Size also affects sensor placement and visibility.

Frequently asked questions

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