To effectively utilise the waste heat from your FutureBit.io Apollo II Full Node to provide cooling in the summer, you can consider the following solutions:

### 1. **Thermoelectric Cooling (Peltier Effect)**
A thermoelectric cooler (TEC) uses the Peltier effect to create a heat flux between the junctions of two different types of materials. It can convert waste heat into cooling directly. Here’s how you can implement it:
- Attach thermoelectric modules to the FutureBit.io Apollo II.
- Use heat sinks and fans to dissipate the heat from the hot side of the TEC.
- The cold side can be used to cool the surrounding air or a specific component.

### 2. **Absorption Refrigeration System**
As previously mentioned, an absorption refrigeration system can use the waste heat generated by your device to drive the cooling process. Here's a simplified setup:
- Install an absorption chiller unit that uses a water-ammonia or lithium bromide-water mixture.
- Channel the waste heat from the Apollo II to the generator of the absorption chiller.
- The absorption chiller will convert this heat into cooling, which can then be used to cool the surrounding space.

### 3. **Heat-Driven Air Conditioning**
Heat-driven air conditioning systems, such as those using adsorption chillers, can be another effective solution. These systems work similarly to absorption chillers but typically use silica gel or zeolites as the absorbent.
- Connect the waste heat source from the Apollo II to the adsorption chiller.
- The chiller will then use this heat to produce a cooling effect, which can be distributed via an air conditioning system.

### 4. **Heat Exchanger with Heat Pump**
A heat exchanger combined with a heat pump can also be an efficient solution:
- Use a heat exchanger to capture the waste heat from the Apollo II.
- Connect the heat exchanger to a heat pump system designed for cooling.
- The heat pump will transfer the captured heat to an external environment, providing a cooling effect.

### 5. **Phase Change Materials (PCM) Cooling**
PCMs can store and release large amounts of thermal energy during the process of melting and solidifying at a specific temperature.
- Integrate PCM panels around the Apollo II.
- During operation, the waste heat will melt the PCM, storing the heat energy.
- When cooling is required, the PCM can release the stored energy, providing a cooling effect as it solidifies.

### Implementation Considerations:
- **Efficiency**: Ensure the chosen system efficiently converts the waste heat into cooling.
- **Space and Cost**: Consider the space available and the cost of installation and maintenance.
- **Compatibility**: Ensure that the cooling system is compatible with the existing setup of your FutureBit.io Apollo II Full Node.
- **Scalability**: If you plan to expand your operations, choose a system that can be easily scaled.

Integrating one of these systems with your FutureBit.io Apollo II will allow you to effectively use the waste heat generated in the winter to provide cooling in the summer, ensuring year-round efficiency and comfort.