✨ Get 20% OFF your first order. ✨

Your Shopping Bag

Your bag is empty

Subtotal $0.00
Shipping Calculated at checkout
Continue Shopping

Easy To Use Thm5421r1021 | Equipment Interface Module Controls Up To 4-stages Of Heat And 2-stages Of Cool In A Heat Pump System And Up To 3-stages Of Heat And 2-stages Of Cool In A Conventional System. | Honeywell Holiday Edition [pAehrM1c]

$20.99 $67.99 -69%

Advanced Equipment Interface ModuleIntroducing the THM5421R1021 Equipment Interface Module from Honeywell, a versatile solution designed to enhance the functionality of heat pump and conventional systems. This module offers unparalleled control over

Secure Shopping

100% Safe Guarantee

Free Shipping

On orders over $30

Money-Back

30-Day Guarantee

Advanced Equipment Interface Module

Introducing the THM5421R1021 Equipment Interface Module from Honeywell, a versatile solution designed to enhance the functionality of heat pump and conventional systems. This module offers unparalleled control over heating and cooling, making it an ideal choice for modern HVAC applications.

Unmatched Control and Flexibility

The THM5421R1021 is a powerhouse of control, allowing for up to 4 stages of heat and 2 stages of cool in a heat pump system. In conventional systems, it supports up to 3 stages of heat and 2 stages of cool. This extensive range of control ensures optimal comfort and energy efficiency, regardless of the system configuration. Key features include:
  • Enhanced heating and cooling capabilities
  • Customizable settings for personalized comfort
  • Seamless integration with a variety of HVAC systems

Enhanced Efficiency and Performance

With its advanced technology and user-friendly design, the THM5421R1021 not only simplifies the management of complex systems but also contributes to improved energy efficiency. This module is designed to work seamlessly with Honeywell's range of HVAC products, ensuring reliable and consistent performance. Some of the practical benefits include:
  • Reduction in energy consumption
  • Extended lifespan of HVAC equipment
  • Increased comfort and satisfaction for users
The THM5421R1021 is a must-have for professionals and homeowners looking to elevate their HVAC systems with cutting-edge technology and superior control.

What Our Customers Say

January 3, 2026

Absolutely no complaints!

A great gadget that is easy to work with.

- Ianthe F..

January 3, 2026

Absolutely no complaints!

An excellent product that is a must-have.

- Kester O..

January 3, 2026

Absolutely no complaints!

I am very impressed with the utility.

- Ursula M..

Write a Review

You Might Also Like

Discover more great products from our collection.

Noodlicht KSIX BXFL04

Noodlicht KSIX BXFL04

(724)
$24.99 $79.99 -69%
Domino Home ESPRIT

Domino Home ESPRIT

(603)
$25.99 $83.99 -69%
ZoomMe Auto-Flex Scooter

ZoomMe Auto-Flex Scooter

(578)
$99.99 $319.99 -69%
QMFQ-30-Z

QMFQ-30-Z

(805)
$31.99 $102.99 -69%
Martina Liana 1337 - Size 12

Martina Liana 1337 - Size 12

(704)
$110.99 $355.99 -69%

Copyright 2026 © mappa-mercia.org

VISA
PayPal
Stripe
Mastercard
CASH ON DELIVERY