Answering the question most buyers have: these HVAC smart relay switches let you automate and remotely control heating, cooling, and related equipment without a full rewire. They’re ideal for DIY installers, energy savers, and tech-forward homeowners who want to retrofit existing systems. The following picks cover Wi‑Fi, Zigbee, and Matter compatibility, with dry contacts for flexible load control. Below you’ll find a quick product table, then in-depth sections to help you choose the right relay for your needs.
Quick product comparison
| Product | Best For | Load (A) | Connectivity |
|---|---|---|---|
| Shelly 1 Gen4 | Multi-device automations, garage doors | 16 | Wi‑Fi, Zigbee, Matter |
| Shelly 1PM Mini Gen4 | Energy monitoring, compact installs | 8 | Wi‑Fi, Zigbee, Matter |
| SwitchBot Matte Relay 1PM | Smart home hubs with Matter support | 16 | Wi‑Fi, Bluetooth, Matter |
| Otcboimo Smart Relay | Flexible voltage support, remote control | 10 | Wi‑Fi, Bluetooth |
| Ogemray 25A Smart Relay | High-load appliances, water heaters | 25 | Wi‑Fi, Bluetooth |
Shelly 1 Gen4 | 16A Smart Relay With Dry Contacts
The Shelly 1 Gen4 is a versatile 1-channel smart relay supporting Wi‑Fi, Zigbee, and Matter with dry contacts. It fits behind switches, outlets, and compact spaces, making it ideal for retrofits in HVAC line controllers, zone dampers, or small pump circuits. Best for: homeowners who want broad protocol support and retrofit capability in a single device. It can automate lights and small appliances, then scale to HVAC control with proper wiring. Caution: ensure dry-contact wiring complies with your HVAC load requirements.
Why it’s selected: It provides flexible connectivity, no hub needed, and compact form for tight spaces. Best for garages and closets where a small but capable relay makes a big difference.
Shelly 1PM Mini Gen4 | Power Metering In A Compact Relay
The Shelly 1PM Mini Gen4 adds real-time power metering to a compact 1-channel relay. It’s ideal for small HVAC components, fans, or heaters where you want to monitor energy use and create smart schedules. Best for: energy-conscious buyers who want visibility into consumption and remote control without bulk hardware. Limitation: supports up to 8A, which may be insufficient for high‑load components like large heaters. Data storage and real-time data are included with the device.
SwitchBot Matte Relay 1PM | 16A, Bluetooth & Wi‑Fi
The SwitchBot Matte Relay 1PM integrates Bluetooth, Wi‑Fi, and Matter compatibility for flexible control of HVAC and other loads. It includes an integrated gateway for cross-brand device communication and supports direct control via voice platforms after setup. Best for: homes seeking a gateway-enabled relay that works with multiple ecosystems. Caution: Matter network requirements may vary by hub, so check compatibility with your existing setup.
Otcboimo Smart Relay Switch Module
The Otcboimo module offers 1 channel with 10A load capacity and dual-mode operation, including self-locking and inching. It supports Tuya/Smart Life apps for remote control and works with Alexa and Google Assistant. Best for: users who want straightforward remote control and simple automation for small HVAC accessories. Limitation: 10A may be insufficient for larger equipment like heaters or water pumps unless used with compartmentalized circuits.
Ogemray 25A Smart Relay | Heavy-Duty, Power Metering
The Ogemray 25A Smart Relay delivers high-load control suitable for water heaters and large HVAC components, with built-in power metering for monitoring energy use. It supports Wi‑Fi and Bluetooth and integrates with major platforms. Best for: households with high-load HVAC equipment needing remote management and energy tracking. Caution: high-load applications require careful wiring and adherence to electrical codes.
Briidea Enclosed Power Control Relay
The Briidea enclosed relay provides protection for internal wiring and uses a small control current to switch a larger load. It’s designed to extend switch life and protect circuits in HVAC installations. Best for: users needing robust enclosure protection and straightforward dry-contact control. Limitation: documentation emphasizes protection features over advanced automation or wireless capabilities.
MHCOZY 4-Channel Smart Relay
The MHCOZY 4-Channel Relay supports Wi‑Fi, Tuya/Smart Life, Bluetooth, and RF remotes for multi-load control. It’s adaptable for DIY HVAC projects, garage doors, and curtains. Best for: multi-load setups requiring independent channel control with fallback RF and Bluetooth options. Limitation: requires configuring multiple channels, which can be complex for simple HVAC tasks.
URURTM 1-Channel Dry Contact WiFi Relay
The URURTM 1CH Dry Contact WiFi Relay emphasizes dry-contact outputs and Tuya Smart Life compatibility, with extra Bluetooth for remote control. Best for: simple HVAC accessory control where a single dry-contact load is sufficient. Limitation: 1-channel design may require layering with additional relays for complex HVAC systems.
Buying Guide: Key Considerations For Your HVAC Relay Switch
- Load capacity: Match the relay’s amperage rating to the HVAC component you plan to control. High-load devices may require 25A or more.
- Wiring type: Dry contacts (potential-free) are versatile but require correct wiring to your HVAC circuit. Ensure compatibility with your existing control wiring.
- Connectivity: Choose between Wi‑Fi, Zigbee, Bluetooth, and Matter based on your current smart home ecosystem and hub availability.
- Power management: If energy monitoring matters, look for built-in metering or the ability to integrate with energy dashboards.
- Form factor: Retrofit-friendly designs fit behind switches, outlets, or inside appliance enclosures. Verify dimensions for your space.
- Hub requirements: Some devices do not require hubs; others may rely on a smart home hub for full functionality or Matter support.
- Safety and codes: Installers should follow local electrical codes and, if needed, consult a licensed electrician for high‑voltage loads.
Frequently Asked Questions
- What is a dry-contact relay and why is it useful for HVAC? A dry-contact relay provides a switching path without a built-in voltage source, allowing flexible wiring to HVAC controls and different voltage domains.
- Do these relays require a hub? Some models work natively with Wi‑Fi and mobile apps, while others integrate via Zigbee, Bluetooth, or Matter hubs for broader ecosystem support.
- Can I use these relays for large HVAC systems? Yes, but check the amperage rating. For high-load components like water heaters, choose 25A or higher models and ensure safe installation.
- Is energy monitoring available with all these options? Not all have built-in metering. If monitoring usage is critical, prioritize models offering real-time power data or compatible telemetry.
- Are Matter or multi-platform integrations important? If you use multiple ecosystems (Alexa, Google Home, Apple HomeKit, SmartThings), pick a relay that supports Matter or multiple protocols for seamless control.
- How difficult is installation? Most devices are designed for retrofit and simple remote control, but high-load HVAC work may require careful wiring and professional assistance.