---
product_id: 1173139
title: "HoneywellHome RTH221B1021 Programmable Thermostat, 1 Week / 4 Time Periods Per Day, Accurate to +/- 1Degree"
brand: "honeywell"
price: "2303158₫"
currency: VND
in_stock: true
reviews_count: 6
url: https://www.desertcart.vn/products/1173139-honeywellhome-rth221b1021-programmable-thermostat-1-week-4-time-periods-per
store_origin: VN
region: Vietnam
---

# 4 programmable time slots/day 1-week single program ±1°F temperature accuracy HoneywellHome RTH221B1021 Programmable Thermostat, 1 Week / 4 Time Periods Per Day, Accurate to +/- 1Degree

**Brand:** honeywell
**Price:** 2303158₫
**Availability:** ✅ In Stock

## Summary

> 🌡️ Stay ahead of comfort—program your week, own your space!

## Quick Answers

- **What is this?** HoneywellHome RTH221B1021 Programmable Thermostat, 1 Week / 4 Time Periods Per Day, Accurate to +/- 1Degree by honeywell
- **How much does it cost?** 2303158₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/1173139-honeywellhome-rth221b1021-programmable-thermostat-1-week-4-time-periods-per)

## Best For

- honeywell enthusiasts

## Why This Product

- Trusted honeywell brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Energy-Smart Design:** Wall-mounted, low-power thermostat powered by 2 AAA batteries with an impressive 8760-hour battery life.
- • **Flexible Scheduling:** Customize up to 4 time periods per day across the entire week—perfect for your dynamic lifestyle.
- • **Precision Comfort Control:** Maintain your ideal temperature with ±1°F accuracy for consistent, cozy vibes all day.
- • **Clear & Customizable Display:** Switch between Fahrenheit/Celsius and 12/24-hour clock on a crisp digital screen with backlight.
- • **Universal HVAC Compatibility:** Seamlessly works with heating, cooling, and heat pumps (sans auxiliary heat) for effortless integration.

## Overview

The Honeywell Home RTH221B1021 is a programmable thermostat offering precise temperature control within ±1°F, featuring a single weekly program with 4 customizable time periods per day. Compatible with most heating and cooling systems (excluding electric baseboard heat), it boasts a clear digital display with Fahrenheit/Celsius and 12/24-hour options, powered by long-lasting AAA batteries for energy-efficient, hassle-free home climate management.

## Description

HoneywellHome RTH221B1021 Programmable Thermostat, 1 Week / 4 Time Periods Per Day, Accurate to +/- 1Degree

## Features

- One program for the entire week-4 periods per day.
- Digital display
- Compatible with heating, cooling and heat pumps without auxiliary heat, Does not work with electric baseboard heat (120-240V) multistage HVAC systems
- Accurate temperature control of plus/-1-Degree F for consistent comfort
- Display options: Fahrenheit or Celsius temperature display, 12 or 24 hour clock

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Honeywell Home |
| Model Name | RTH221B1021 |
| Controller Type | Push Button |
| Special Feature | Temperature Display, Programmable |
| Color | Off White |
| Specific Uses For Product | Furnace |
| Temperature Control Type | Heating |
| Connectivity Technology | Wi-Fi |
| Included Components | Thermostat, Mounting Hardware, User Manual |
| Power Source | Corded Electric |
| Item Weight | 7.2 Ounces |
| Voltage | 120240 Volts |
| Material | Plastic |
| Display Type | Digital |
| Screen Size | 8 Inches |
| Control Type | Button Control |
| Connectivity Protocol | Wi-Fi |
| Mounting Type | Wall Mount |
| Style | Original_Style |
| Backlight | Yes |
| Specification Met | Energy Saving Thermostat |
| Number of Batteries | 2 AAA batteries required. |
| UPC | 085267866958 |
| Global Trade Identification Number | 00085267866958 |
| Manufacturer | Honeywell Home |
| Part Number | Home |
| Item Weight | 7.2 ounces |
| Product Dimensions | 3.75 x 1 x 4.75 inches |
| Item model number | RTH221B1021/E1 |
| Batteries | 2 AAA batteries required. |
| Is Discontinued By Manufacturer | No |
| Size | EA |
| Pattern | Thermostat |
| Item Package Quantity | 1 |
| Special Features | Temperature Display, Programmable |
| Batteries Included? | No |
| Batteries Required? | Yes |
| Average Battery Life | 8760 Hours |
| Warranty Description | Comes with manufacturer warranty. |

## Product Details

- **Brand:** Honeywell Home
- **Model Name:** RTH221B1021
- **Controller Type:** Push Button
- **Special Feature:** Temperature Display, Programmable
- **Color:** Off White

## Images

![HoneywellHome RTH221B1021 Programmable Thermostat, 1 Week / 4 Time Periods Per Day, Accurate to +/- 1Degree - Image 1](https://m.media-amazon.com/images/I/51suD3FrYKL.jpg)

## Available Options

This product comes in different **Pattern Name, Style** options.

## Questions & Answers

**Q: Will it work on 12v RV replacements?**
A: yes sir, it will work in replace of many thermostats. amazingly inexpensive for all the features. ive used on everything from camp heaters in an rv to full central heat ac systems.hope this answered your question.

**Q: Does the display light up?**
A: No, the display does not light up.  It is a very basic, but very simple to operate unit.

**Q: What is the lowest temperature setting.  I just need a setting to keep pipe from freezing, 35 or 40 degrees maybe?**
A: It goes down to 40, but be careful.  40 degrees at the interior location of the thermostat does not guarantee that the basement and pipes in exterior walls will stay above freezing.  If you have fixtures on exterior walls, typically kitchen sink, leave the sink base cabinet door open to allow the pipes to be exposed to warmer room air

**Q: I'm replacing my analog thermostat with a digital one. The ones at Lowes and Home Depot are almost $100 or more, will this work just as well?**
A: Yes, this should work just fine.  Pricier model are just prettier and have more sophisticated programming and/or connecting to your smart phone abilities.  As far as programming goes, this one is NOT a 1-week thermostat.  You can only create one daily program.  You set 4 points in a 24 hours span (i.e. 1-day) and then this program is repeated day after day.  If you don't need programming, there is a cheaper version where you just set the temperature.  Or there are pricier ones where you can create separate programs for work days and weekends ( 5/2 programming ) or 7 distinct programs for each day of the week (7-day thermostat).

## Customer Reviews

### ⭐⭐⭐⭐⭐ ヽ(◉◡◔)ﾉ
*by S***I on December 22, 2014*

Here the deal:We had one of those Commercial grade Honeywell touchscreen thermostats that usually do a great job, but we noticed the temperature in the house never seemed to keep, and would hear the unit, whether heater or ac, kick on quite a bit. We decided to do some research, and with a deal from our energy provider, we ended up with one of those $249 Nest thermostats. I was STOKED, like a fat kid with some apple pie. We got the Nest in, and I went to work. Like a Dad in bad joke bookstore. I've replaced many thermostats over the years and the Nest was a piece of cake. BUT, we discovered it had a malfunction, so after talking with tech support, it was getting replaced. SOOOO, back to the Honeywell. I went out to the garage and grabbed the oldie off the shelf, and as I was walking in, my Dollar Store flip flop got caught on the door jam. It popped the rubber thing out of the foam bottom and made me nearly fall over forwards onto the hard tiled floor. There i was, Rambo faced, screaming in slo motion, feeling the pain of my big toe hit the metal, when all of a sudden the Honeywell touch screen goes flying out of my hands, and flips, and turns, and swings, and screams, to the floor. BAM!!! Cracked screen. Out of Commission. No Goodie No More. Mad me. I dropped the ball, but it wasn't the ball man, it was my $150 Honeywell touch screen I had plans to put back onto the wall when we sold the house years from now. So there I was, at a cross roads, like Willow, but without Mad Mardigan there to take the baby. I broke my working thermostat, and was left with TWO broken thermostats. It was humid, then cold, then hot, then cold, then humid, the windows were open, they were closed, they were damned like Conan the Barbarian was.I decided to order THIS thermostat from Amazon. I got in two days, and the hookup was easy. Easy yo. I'm talking so easy, I thought about taking it for a drink and a meal. The thermostat works like a champ! However I now rec'd the replacement Nest thrmostat and this one is taken down, boxed up, and awaits its new homeowner in severla years whoever and whenever that may be.Pros:1. Easy to install (C wire is Common and NOT used)2. Basic use makes ti fun for all ages!3. Basic programming is available, but nothing that is 3 pointer at the buzzer wow4. Small, and easy to useCons:1. None. It works great and is easy to install

### ⭐⭐⭐⭐⭐ Very accurate. Four years, and only replaced batteries once.
*by D***T on February 8, 2025*

It still works. I just want one that lights up when I push a button. It's in a dark corner and the light on the phone is a hassle when going to bed. I'll use more batteries for the convenience. I don't mind to FAFO. EV anyone? Now there's a massive battery.So ¼ oz of battery to control the heat where I live is perfect.Installation is easy.Two screws is all.Very simple.Great control.Wonderful display.

### ⭐⭐⭐⭐ Basic thermostat
*by W***H on November 24, 2024*

Good quality, easy to install (thanks to you tube) and program. Basic functions, just like I wanted. Be sure and get the model that illuminates.

## Frequently Bought Together

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-03-08*