美国采购需求：控制器逆变器、发电机、水平风力涡轮机、太阳能电池板、垂直风力涡轮机、风力涡轮机玩具

I'm looking for some guidance on installing energy-efficient products for my home. Specifically, I have a 4-bedroom house and would appreciate your recommendations on suitable products that can meet our needs. Additionally, it would be helpful to know the estimated costs of the recommended options. I'm also curious about the installation process – how straightforward is it? Furthermore, I'd love to understand the potential energy savings we can expect. Are any of these products close to providing "free energy," or at least significantly lower our utility bills? If possible, could you present three recommendations for both the 4-bedroom house and a 2-bedroom property? Your expertise would be greatly appreciated in helping us make an informed decision!