# YoLink Thermostat 2, Dual-Stage Heat & Cool

*YoLink / YS4004*

> The YoLink Thermostat 2, Dual-Stage Heat & Cool (YS4004) is a dual-stage 24 VAC thermostat that supports up to two YS8007 sensors. It suits Google Home and Alexa users, with native support through the maker's hub. Home Assistant users reach it through an integration (the maker's hub).

- Canonical page: https://smarthomecanon.com/devices/yolink-thermostat-2-dual-stage-heat-cool
- Last checked: 2026-10-20

## Key facts

| Fact | Value |
| --- | --- |
| Brand | [YoLink](https://smarthomecanon.com/brands/yolink) |
| Category | Thermostat |
| Model numbers | YS4004 |
| Status | Current[^1] |
| Type | Dual-stage thermostat[^1] |
| Power | 24 VAC with C wire[^1] |
| Key spec | Supports up to two YS8007 sensors; Demand Response[^1] |
| Radio | LoRa to a YoLink hub[^1] |
| Range | Up to 2,034 ft (620 m) open air[^1] |

## Integration paths

**How the YoLink Thermostat 2, Dual-Stage Heat & Cool connects**

| Path | Requires | Local | Features lost |
| --- | --- | --- | --- |
| [Proprietary + hub](https://smarthomecanon.com/protocols/proprietary-gateway) | YoLink Hub[^1] | unknown | unknown |

**Platform support for the YoLink Thermostat 2, Dual-Stage Heat & Cool**

| Path | Platform | Support | Integration |
| --- | --- | --- | --- |
| Proprietary + hub | [Amazon Alexa](https://smarthomecanon.com/platforms/alexa) | Native[^1] |  |
| Proprietary + hub | [Google Home](https://smarthomecanon.com/platforms/google-home) | Native[^1] |  |
| Proprietary + hub | [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) | withheld |  |

## Related pages

- [YoLink temperature and humidity sensors and thermostats](https://smarthomecanon.com/lines/yolink-temperature-humidity-and-thermostats) (line)
- [YoLink](https://smarthomecanon.com/brands/yolink) (brand)
- [Proprietary radio with a hub](https://smarthomecanon.com/protocols/proprietary-gateway) (protocol)
- [Amazon Alexa](https://smarthomecanon.com/platforms/alexa) (platform)
- [Google Home](https://smarthomecanon.com/platforms/google-home) (platform)
- [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) (platform)

## Sources

[^1]: YoLink Thermostat 2, Dual-Stage Heat & Cool - YoLink. https://shop.yosmart.com/products/ys4004 (manufacturer, checked 2026-10-20)