HoneywellHome RTH221B1039 1-Week Programmable Thermostat

HoneywellHome RTH221B1039 1-Week Programmable Thermostat

Q: How did everyone else get the red wire in if it is so tightly screwed in? I can’t seem to get it to budge, even with the correct size screwdriver.

I used a small flathead that fit in the slot. Then used pliers on the shaft of the screwdriver. I used the pliers to turn the screwdriver and I was able to loosen the screw

Q: Where can I find an owners manual?

Jeezus people, if the person is asking isn’t it obvious he does not have it in the box?!! The least helpful answers ever. I inherited the thermostat from a previous owner and in search for a manual, too. Guess what— no box!!

Q: How do I put it on. I cannot program it

Hi, thank you for reaching out with this. We would like to gather some more information on your specific system so that we can provide assistance on how to program. Please reach out to our support team on Facebook/Twitter with a private message. We look forward to hearing from you soon. -Jim

Q: does this thermostat use a battery for power? and how long should the battery last if it needs one

Hi there, this thermostat requires 2 AAA batteries, battery life depends on the usage, we recommend replacing batteries at least every year. - Maria

Product ID: 27042208

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Details

Brand
Honeywell Home
Model Name
RTH221B
Product Dimensions
1"D x 4.75"W x
Controller Type
Hand Control
Special Feature
Clock Display

⏰1-week programmable schedule

🔋low battery reminder

🌡️±1°F precise temperature control

Description

🌟 Own your comfort schedule—because your home should work on your time.

SMART BATTERY ALERTS - Never get caught off guard with built-in low battery reminders keeping your system running smoothly.
DIY FRIENDLY INSTALLATION - Simple step-by-step setup means no technician needed—get smart comfort on your terms.
FLEXIBLE DISPLAY OVERRIDE - Choose Fahrenheit or Celsius, 12/24-hour clock, plus temporary or permanent overrides for ultimate control.
EFFORTLESS WEEKLY SCHEDULING - Customize your comfort with 4 daily periods—wake, leave, return, sleep—set once for the entire week.
PRECISION TEMPERATURE MASTERY - Maintain your ideal climate with ±1°F accuracy, ensuring consistent cozy vibes all day long.

The Honeywell Home RTH221B1039 is a sleek, battery-powered programmable thermostat designed for easy DIY installation and precise temperature control within ±1°F. Featuring a one-week programming schedule with four customizable daily periods, it optimizes energy savings by adjusting heating and cooling based on your lifestyle. Its intuitive LCD display offers flexible settings including Fahrenheit/Celsius and 12/24-hour clock formats, complemented by low battery reminders to ensure uninterrupted comfort. Ideal for heating, cooling, and heat pump systems without auxiliary heat, this thermostat blends simplicity with smart functionality for the modern home.

Specifications

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	Rectangular
Display Type	LCD
Finish Type	White
Control Type	Button Control
Control Method	Touch
Mounting Type	Wall Mount
Style	Thermostat
Backlight	Yes
Specification Met	energy
Number of Batteries	2 AA batteries required.
UPC	085267348553
Global Trade Identification Number	00085267348553
Manufacturer	Honeywell Home
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