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Item #:
89871739
P621U 5/1/1-Day Programmable Universal 2-Heat/1-Cool Thermostat
85% of respondents would recommend this to a friend
Item #:
89871739
XCD 122
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What Stands Out
7-Day Programming
Customizable scheduling allows users to set different temperatures for each day, enhancing comfort and energy efficiency tailored to personal schedules.
Dual Fuel Options
Supports 2 heat and 2 cool settings, providing versatility for both heat pump and conventional heating systems, ensuring optimal comfort year-round.
Easy Installation
Designed for straightforward setup, the Lux LTX9100U comes with clear instructions, making it accessible for DIY enthusiasts without professional assistance.
Product Details
| Controller Type | Push Button |
| Additional Features | Universal compatibility for conventional heat & A/C. Universal compatibility for heat pumps with up to 2-stage heat/1 stage cool (including AUX/EMERG heat). 2 and 3-wire hydronic systems (hot water baseboard & radiator). Gas Millivolt heaters (wall heaters/furnaces & gas fireplaces) |
| Specific Uses For Product | Air Conditioner, Heat Pump |
| Temperature Control Type | programmable |
| Power Source | Battery Powered |
| Voltage | 24 volts_of_alternating_current |
| Display Type | LCD |
| Control Type | Button Control |
| Control Method | Touch |
| Mounting Type | Wall Mount |
| Number of Batteries | 2 AA batteries required. (included) |
| Color | White |
| Shape | Rectangular |
| Product Style | P621U 5/1/1-Day Programmable or Non-Programmable |
| Item Weight | 1.76 ounces (49.9 grams) |
| Brand Name | LUX |
| Model Name | P621U |
| Included Components | P621U-010 Programmable 5-1-1 Day Thermostat |
| Model Number | P621U |
| UPC | 021079126217 |
| Global Trade Identification Number | 00021079126217 |
| Manufacturer | EME Americas Inc. |
| Number of Items | 1 |
| Unit Count | 1 Count |
| Number of Packs | 1 |
| Item Type Name | Diversitech 675-P621U Thermostat, 5-1-1P, NP, 2H/C |
| Manufacturer Part Number | 675-P621U |
| Material Type | Plastic |
| Brand | LUX |
| Special Feature | Universal compatibility for conventional heat & A/C. Universal compatibility for heat pumps with up to 2-stage heat/1 stage cool (including AUX/EMERG heat). 2 and 3-wire hydronic systems (hot water baseboard & radiator). Gas Millivolt heaters (wall heaters/furnaces & gas fireplaces) See more |
Who Should Buy?
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Busy Professionals
This thermostat allows programming for specific schedules, saving energy and ensuring comfort around busy work hours.
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Tech-Savvy Users
With advanced features, it appeals to users who appreciate technology and want customized temperature control in their homes.
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Energy-Saving Enthusiasts
Designed for optimal energy efficiency, it helps users reduce bills while maintaining desired temperature settings comfortably.
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Elderly Users
Complex programming may be challenging for elderly users who prefer simpler, more straightforward temperature control methods.
Product Description
P621U 5/1/1-Day Programmable Universal 2-Heat/1-Cool Thermostat
Have any Query? Chat with us
Customer Questions & Answers
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Question:
What features does the Lux LTX700U-A04 thermostat offer?
Answer: The Lux LTX700U-A04 thermostat includes advanced features such as a 7-day programmable schedule, allowing users to customize heating and cooling settings for each day of the week. It supports 2 heating stages and 1 cooling stage, making it ideal for various HVAC systems. This versatility enables homeowners to optimize their energy usage while maintaining comfort, as it can be programmed to adjust temperatures during peak and off-peak hours. -
Question:
How do I install the Lux LTX700U-A04 thermostat?
Answer: Installation of the Lux LTX700U-A04 can be done following a few simple steps: first, turn off the power to your HVAC system. Remove the old thermostat and connect the wires to the corresponding terminals on the Lux model. Follow the on-screen instructions to set up your preferences. Ensure you understand the wiring diagram compatible with your system for a seamless installation. This thermostat is designed for DIY enthusiasts and professionals alike. -
Question:
Can the Lux LTX700U-A04 thermostat be controlled remotely?
Answer: The Lux LTX700U-A04 does not offer Wi-Fi connectivity for remote control. It is designed to provide programmable settings directly on the device. Users can manually adjust or pre-program settings for convenience. For those who require remote capabilities, assessing other models with smart features may be beneficial. However, this thermostat is excellent for individuals who prefer hands-on management without relying on mobile apps. -
Question:
What compatibility does the Lux LTX700U-A04 have with HVAC systems?
Answer: The Lux LTX700U-A04 is compatible with a range of HVAC systems, specifically designed for 2 heat and 1 cool configurations. It works seamlessly with conventional heating systems, heat pumps, and most 24V systems. To ensure maximum performance, it’s important to check your existing setup against the thermostat's specifications. This compatibility allows homeowners to easily upgrade their existing thermostats without extensive system modifications. -
Question:
How does the programming of the Lux LTX700U-A04 work?
Answer: Programming the Lux LTX700U-A04 thermostat is straightforward, allowing users to set different temperatures for each day of the week. The intuitive interface enables quick adjustments, so you can program specific wake, away, home, and sleep times. This feature helps optimize comfort and energy efficiency by reducing unnecessary heating or cooling when you're not home. A well-done programming can lead to significant savings in energy usage. -
Question:
Is the Lux LTX700U-A04 easy to read and operate?
Answer: Yes, the Lux LTX700U-A04 comes equipped with a clear display that shows current and set temperatures at a glance. The user-friendly buttons make it easy to navigate through settings and adjust schedules. This design ensures that even individuals who are not tech-savvy can operate it effectively. Consequently, for families or older adults, the straightforward interface enhances accessibility and usability. -
Question:
What kind of maintenance does the Lux LTX700U-A04 require?
Answer: The maintenance for the Lux LTX700U-A04 is minimal, as it is designed for reliability and efficiency. Users should periodically check for dust or debris on the thermostat and clean the screen as needed. It's also beneficial to periodically review and adjust programming based on seasonal changes. Keeping the thermostat clear ensures accurate readings and prolongs the life of both the device and your HVAC system. -
Question:
Does the Lux LTX700U-A04 have energy-saving features?
Answer: The Lux LTX700U-A04 incorporates energy-saving features through its programmable scheduling. This functionality helps homeowners to easily reduce energy consumption by adjusting heating and cooling settings according to usage patterns. By programming lower temperatures during the day while away or overnight, users can significantly decrease their energy bills without sacrificing comfort. This makes it an eco-friendly choice for energy-conscious families. -
Question:
What is the temperature range supported by the Lux LTX700U-A04?
Answer: The Lux LTX700U-A04 supports a temperature range from 40°F to 90°F (4°C to 32°C), accommodating various heating and cooling needs. This range is designed to suit most climate conditions, providing flexibility for comfort throughout the seasons. Whether you're looking to heat your home during the cold winter months or cool it down in the summer, the thermostat can help maintain your desired temperature effectively. -
Question:
Where can I buy the Lux LTX700U-A04 Programmable 7 Day Thermostat, 2 Heat, 1 Cool?
Answer: You can buy the Lux LTX700U-A04 Programmable 7 Day Thermostat, 2 Heat, 1 Cool at Ubuy in Montserrat. Ubuy offers a convenient shopping experience with options to explore detailed product specifications, customer reviews, and availability. By choosing Ubuy, you can easily find this product and have it delivered right to your doorstep.
LUX Programmable P621U Editorial Review
The Lux Pro P521U Programmable Thermostat has received a mixed but generally positive reception among users, particularly for its functionality and price. Many customers appreciate the straightforward installation process, noting that even those with limited experience can manage to set it up with relative ease, thanks to clear instructions and helpful diagrams for common wiring schemes. However, the simplicity of the printed manual often results in frustration, with users expressing the need for more detailed and explicit guidance readily accessible within the package. Once installed, this thermostat impresses users with a number of programmable features that offer substantial value for its cost. The “smart recovery” feature, which anticipates when to start heating or cooling based on how long it takes to reach the desired temperature, is a standout. It also includes filter reminders, adding to its practicality. The primary drawback noted by users is the user interface, which isn't as intuitive as one might hope. While basic functions are simple to access, more advanced features require a cumbersome series of steps. Users often found themselves needing to Consult the manual for operations that could have been streamlined, detracting from an otherwise enjoyable experience. Moreover, interaction quirks, such as switching the display between Fahrenheit and Celsius, could easily vex even the more patient user. Overall, the Lux Pro P521U is recommended for those looking for a budget-friendly, programmable thermostat with solid features, but Prospective buyers should be prepared to invest time in understanding its somewhat convoluted user interface. **
Customer Reviews & Ratings
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Pros
- Easy installation process, even for novices.
- Affordable price point with good programmable features.
- Includes smart recovery and filter reminders.
- Clean design with a closable faceplate.
Cons
- User interface can be unintuitive and cumbersome.
Platform Trust & Buyer Confidence
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Jazz
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“Easy to use and always helpful and sorts any issues I've had past and present”
1 September 2026 · via Trustpilot
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“The delivery was fast and the product came undamaged and authentic.”
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Hengo
Verified buyer
“Fast, convenient and cheap. Great store!”
27 August 2026 · via Trustpilot
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XCD 122
Order now and get it around Monday, September 14
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Features & Benefits
- Compatible with all heating and cooling systems except electric baseboard heat.
- Graphical air filter monitor reminds you when to change your air filter.
- Exclusive LUX speed slide allows for easy programming.
- Separate programming for weekdays and weekends to enhance comfort.
- Multiple periods per day for tailored climate control.
- Elevate your home's atmosphere with enhanced efficiency.
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