As a homeowner in California, you're probably familiar with the high cost of energy, especially when it comes to heating and cooling your home. With an old HVAC system, you could be spending far more on your energy bills than necessary. In this article, we'll discuss the potential savings you could achieve by upgrading to a modern, energy-efficient HVAC system, particularly in the context of California's energy landscape.   Understanding Energy Costs in California   California is known for its high energy costs, with electricity rates reaching almost $0.20 per kilowatt-hour (kWh)…