# SITERWELL Smart Thermostate C-Wire Connector

## C-Wire Power Support for Compatible Smart Thermostat Installations

The **SITERWELL Smart Thermostat C-Wire Connector** is an installation accessory designed for compatible **24V HVAC thermostat systems** that require a reliable common-wire (C-wire) connection for smart thermostat operation.

For customers installing the [**Siterwell GS366A-MWAC Smart Thermostat**](/products/gs366-smart-thermostate), this connector provides a dedicated SITERWELL accessory option to help complete a compatible thermostat setup. Always confirm your HVAC wiring and terminal configuration before installation.

### Why Choose the SITERWELL C-Wire Connector?

-   **Built for smart thermostat installations:** Designed for compatible 24V HVAC thermostat applications where a C-wire connection is required.
-   **GS366A-MWAC ecosystem support:** A practical accessory option for compatible SITERWELL smart thermostat installations.
-   **Simple system planning:** Helps keep thermostat power and installation requirements within one SITERWELL product ecosystem.
-   **Installation-focused design:** Intended for use as part of a properly verified thermostat wiring setup.

### Check Compatibility Before Installation

HVAC wiring varies by system. Before purchasing or installing this accessory, confirm your thermostat terminals, HVAC control-board wiring and system compatibility. If you are unsure about wiring requirements, consult a qualified HVAC professional.

For product-specific setup and compatibility questions, visit the [**GS366A-MWAC Smart Thermostat FAQ**](/pages/gs366a-mwac-faq). For broader SITERWELL product, order and support questions, see the [**SITERWELL FAQ**](/pages/siterwell-help-faq).

**Building a GS366A-MWAC setup?** Review the [**GS366A-MWAC Smart Thermostat**](/products/gs366-smart-thermostate) product page before completing your installation plan.

### Protect Your Delivery

For extra protection against eligible physical loss, external damage or shortage while your order is in transit—and eligible theft after delivery within the coverage term—consider adding optional [**Shipsurance shipping insurance**](/pages/shipsurance) when it is offered at checkout. If you purchased this coverage and a shipping-related issue occurs, review the coverage rules and contact **SureCircle** first to file a claim or check claim status. Product setup, technical support, product defects and manufacturer-warranty questions remain with SITERWELL.

## Details

- **Price:** 23.99 USD
- **Vendor:** Siterwell
- **Type:** Wi-Fi Smart Thermostat for Compatible 24V HVAC Systems
- **Tags:** Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 23.99 USD | In stock |

## Images

- SITERWELL Smart Thermostate C-Wire Connector
- SITERWELL Smart Thermostate C-Wire Connector
- SITERWELL Smart Thermostate C-Wire Connector
- SITERWELL Smart Thermostate C-Wire Connector
- SITERWELL Smart Thermostate C-Wire Connector
- SITERWELL Smart Thermostate C-Wire Connector
- SITERWELL Smart Thermostate C-Wire Connector
- SITERWELL Smart Thermostate C-Wire Connector
- SITERWELL Smart Thermostate C-Wire Connector
- SITERWELL Smart Thermostate C-Wire Connector

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> Source: [siterwell.us](https://store.siterwellhome.com/products/c-wire-connector)
> Updated: 2026-09-28