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

Desertcart Logo

Deliver to SINGAPORE

For best experience Get the App

DOWNLOAD THE APP

WE SOURCE ITEMS FROM

UAE
UK
India
USA
Japan
KOREA

Customer Services

About Us

Customer Support

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

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.