









🌡️ Stay cool, save cash, and never miss a beat with Honeywell precision!
The Honeywell Home RTH221B1039 is a sleek, battery-powered programmable thermostat offering one-week scheduling with four customizable daily periods. It delivers precise temperature control within ±1°F, features an easy-to-read digital display, and includes low battery reminders. Designed for simple DIY installation, it supports heating, cooling, and heat pumps (without auxiliary heat), making it an energy-efficient upgrade for modern homes.




| Brand | Honeywell Home |
| Model Name | RTH221B |
| Product Dimensions | 1"D x 4.75"W x 3.5"H |
| Controller Type | Hand Control |
| Special Feature | Clock Display, Low Battery Indicator, Low Voltage, Programmable |
| Color | White |
| Specific Uses For Product | Air Conditioner, Furnace |
| Temperature Control Type | Heating and Cooling |
| Connectivity Technology | Non-connected |
| Included Components | Mounting Hardware, Thermostat, User Manual |
| Power Source | Battery Powered |
| Voltage | 24 Volts |
| Material | Plastic |
| Shape | Curved |
| Display Type | Digital |
| Finish Type | White |
| Control Type | Button Control |
| Control Method | Touch |
| Mounting Type | Wall Mount |
| Style | Contemporary |
| Backlight | Yes |
| Specification Met | energy |
| Number of Batteries | 2 AA batteries required. |
| UPC | 085267348553 |
| Global Trade Identification Number | 00085267348553 |
| Manufacturer | Honeywell |
| Part Number | RTH221B |
| Item Weight | 10.5 ounces |
| Item model number | RTH221B1039 |
| Batteries | 2 AA batteries required. |
| Is Discontinued By Manufacturer | No |
| Size | 3.5H x 4.75W x 1D (in.) |
| Finish | White |
| Pattern | Thermostat |
| Item Package Quantity | 1 |
| Cutting Diameter | 1.1 Inches |
| Special Features | Clock Display, Low Battery Indicator, Low Voltage, Programmable |
| Batteries Included? | No |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Warranty Description | 1 year limited. |
| Assembled Diameter | 1.1 Inches |
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