Honeywell Home RTH21B Programmable Thermostat: Flexible scheduling with 7-day, 5-1-1 day, 5-2 day, or 1 week options
This Honeywell Home thermostat is for the homeowner who wants to save on energy bills without constant manual adjustments. It replaces the hassle of daily temperature tweaks with a tool for effortless comfort control.
Set a flexible schedule that fits your life, like programming lower heat while you're at work and warming up the house before you return. The large, backlit screen makes it easy to check settings from across the room. You'll appreciate the change filter reminder, which helps maintain your HVAC system's efficiency before issues arise.
Compatible with most single-stage heating and cooling systems, this thermostat installs simply with the included wall plate. Use it to create a personalized routine that keeps your home comfortable and reduces energy waste.
Features
- 1 Heat/1 Cool compatibility for forced air systems
- Large backlit display with clear font
- Change air filter reminder and custom display settings
- Easy installation with UWP wall plate
- Extended 32°F low-heat setpoint
- Flexible scheduling with 7-day, 5-1-1 day, 5-2 day, or 1 week options
General specs
- Brand: Honeywell Home
- Model: RTH21B
- Seller: Amazon
- ID: B0DSGF9GDJ
- Material: Plastic
- Dimensions: 6.5, 1.6, 8.55
- Scheduling: 7-Day, Weekly
- Connectivity: Wired
- Display Type: LCD
- Power Source: Battery
- Mounting Type: Wall Mount
- Control Methods: Buttons
- Compatible Systems: Air Conditioner, Gas Boiler, Water Heating
- First listed by seller: 1/14/26
If you are interested in more details, you can find full information on the seller's page.
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| Brand | Honeywell Home | Honeywell Home | Riseem | Honeywell | SASWELL | Mysa |
| Model | RTH21B | RTH20B | STN701W-Blue | RENEWRTH9585WF/U | T18BUTW-7-WIFI(TY) | BB V2-0-L |
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| Price | $44.40 | $34.00 | $54.99 | $89.99 | $69.99 | $99.00 |
| Seller | Amazon | Amazon | Amazon | Amazon | Amazon | Amazon |
| Update | Jan 14, 2026 | Feb 7, 2026 | Feb 7, 2026 | Jan 16, 2026 | Feb 4, 2026 | Feb 7, 2026 |
| Dimensions | 6.5, 1.6, 8.55 | 8, 6, 0.84 | 0.98, 3.86, 4.72 | 4.5, 3.5, 0.88 | 4.65, 6.02, 2.48 | |
| Scheduling | 7-Day, Weekly | 5-2 Day | 7-Day | Flexible programming | Weekly | |
| Connectivity | Wired | Wi-Fi | Wi-Fi | Wi-Fi | Wi-Fi | |
| Display Type | LCD | LCD | Touchscreen | LED, Color LCD | LCD | |
| Power Source | Battery | Battery | Hardwired | Hardwired | Wired | Hardwired |
| Mounting Type | Wall Mount | Wall Mount | Wall Mount | Wall Mount | Wall-Mounted | Wall Mount |
| Control Methods | Buttons | Buttons | App, Buttons | Touchscreen | App, Voice, Touchscreen | App, Voice |
| Compatible Systems | Air Conditioner, Gas Boiler, Water Heating | Air Conditioner, Electric Boiler, Gas Boiler, Water Heating | Air Conditioner, Gas Boiler | Forced air (gas, oil or electric), Hot water and steam, Heat pumps with electric backup | Electric Baseboard Heater, Fan Coil Unit | |