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

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!!

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

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

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Honeywell Home RTH221B1039 RTH221B Programmable Thermostat, White | RTH221B1039

Honeywell Home RTH221B1039 RTH221B Programmable Thermostat, White | RTH221B1039

Product ID: 27042208

Details

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

⏰1-week programmable schedule

🔋Battery change reminders

🌡️±1°F precise temperature control

Description

🌡️ Take control of your comfort—programmed for your life, designed for your home.

SMART BATTERY ALERTS - Never get caught off guard with built-in low battery reminders, keeping your thermostat running smoothly without interruption.
PRECISION COMFORT CONTROL - Maintain your ideal temperature within ±1°F accuracy, ensuring your home feels just right, always.
EFFORTLESS DIY INSTALLATION - Simple step-by-step setup with included hardware means no need to wait for a technician—get comfort on your terms.
FLEXIBLE DISPLAY OVERRIDE - Choose Fahrenheit or Celsius, 12/24-hour clock, plus easy temporary or permanent overrides for ultimate control.
STREAMLINED WEEKLY SCHEDULING - Set one consistent program for all 7 days with 4 customizable periods—wake, leave, return, sleep—perfect for a busy lifestyle.

The Honeywell Home RTH221B1039 is a sleek, white programmable thermostat designed for simple, one-week scheduling with four daily periods. It offers precise temperature control within ±1°F, an easy-to-read digital display, and user-friendly DIY installation. Battery-powered with low battery alerts, it supports heating, cooling, and heat pumps (without auxiliary heat), making it an energy-efficient upgrade for modern homes seeking consistent comfort and cost savings.

Specifications

ASIN	B018A3DHJY
Additional Features	Clock Display, Low Battery Indicator, Low Voltage, Programmable
Best Sellers Rank	#54,440 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #77 in Home Programmable Thermostats
Brand Name	Honeywell Home
Color	White
Connectivity Technology	Non-connected
Control Method	Touch
Control Type	Button Control
Controller Type	Hand Control
Customer Reviews	4.3 4.3 out of 5 stars (7,796)
Display Type	Digital
Finish Types	White
Global Trade Identification Number	00085267348553
Included Components	Mounting Hardware, Thermostat, User Manual
Item Dimensions D x W x H	1"D x 4.75"W x 3.5"H
Item Type Name	Programmable Thermostat
Manufacturer	Honeywell
Manufacturer Part Number	RTH221B
Manufacturer Warranty Description	1 year limited.
Material Type	Plastic
Model Name	RTH221B
Model Number	RTH221B1039
Mounting Type	Wall Mount
Number of Batteries	2 AA batteries required.
Power Source	Battery Powered
Product Style	Contemporary
Shape	Curved
Specific Uses For Product	Air Conditioner, Furnace
Specification Met	energy
Temperature Control Type	Heating and Cooling
UPC	085267348553
Voltage	24 volts

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