Skip to main contentSkip to footer

Overview

The Honeywell Home X2P RTHC21B Programmable Thermostat provides convenient temperature control for compatible single-stage heating and cooling systems. With flexible scheduling options, a large backlit display, and customizable settings, it helps maintain indoor comfort according to your daily routine. Filter-change reminders and a simple interface make everyday operation easy.

Honeywell Home X2P RTHC21B Single-Stage Programmable Thermostat - White

Model: RTHC21B
Web Code: 20208481
Sold and shipped by | 4.2 seller rating (129 reviews)

Available for deliveryAvailable online only

Delivery times vary by location. Most Marketplace items leave sellers' locations within 2 business days. Allow additional time for shipping.

Enjoy on orders from this seller.

Seller Return Policy

Read return policy

Warranty Information

Check with the manufacturer for details.

For Quebec residents: See the Availability Guarantee disclosure in the Specifications section below.

• Flexible Scheduling: Choose 5-2 day, 5-1-1 day, or 7-day programming to match your weekly routine.

• Single-Stage Compatibility: Designed for compatible 1 Heat/1 Cool conventional heating and cooling systems.

• Multiple Operating Modes: Supports Heat, Cool, Auto, and Off modes, depending on system configuration.

• Large Backlit Display: Provides clear, easy-to-read temperature and system information.

• Customizable Display: Adjust display settings to suit your preferences.

• Filter-Change Reminder: Optional reminders help you keep track of HVAC filter maintenance.

• Battery Powered: Uses 2 AA alkaline batteries (not included).

• Easy Installation: Includes a Universal Wall Plate (UWP), mounting hardware, and installation documentation.

• System Compatibility: Suitable for compatible forced-air gas, oil, or electric systems, hot-water heating, and select low-voltage systems. Not compatible with 120–240V electric baseboard heating.

For Quebec residents – Disclosure under the Consumer Protection Act

In compliance with Bill 29, Best Buy and third-party sellers on Best Buy Marketplace do not guarantee the availability of replacement parts, repair services, or maintenance information for any products. Coverage provided through any Best Buy Protection programs and applicable manufacturer warranties, if any, remain in place. Please contact the manufacturer directly for information about their availability guarantee.

Shipping Charges

Free standard shipping on all orders.

Processing Time

Most items ship within 2 business days after an order is placed*. Allow additional time for shipping to your address.
*Please note: If an item you ordered becomes unavailable, you'll be notified and a full refund will be processed within 2 business days.

Shipping Area Restrictions

Shipping is not available in the following areas*:
  • British Columbia (Remote)
  • Alberta (Remote)
  • Saskatchewan (Remote)
  • Manitoba (Remote)
  • New Brunswick (Remote)
  • Nova Scotia (Remote)
  • Prince Edward Island (Remote)
  • Newfoundland and Labrador (Remote)
  • Yukon
  • Northwest Territories
  • Nunavut
*Please note: Shipping area restrictions may vary for large items. If an item can't be shipped to your address, we'll let you know during the checkout process.
Product Category
Smart home products
Return/Exchange Period
30 days
Condition
Opened

Learn more about returning a Marketplace product