请将以下文本总结在3句话以内。如果可以，尽量保留原文的核心观点：_deploying solar panels on the rooftops has gained popularity as people are becoming more environmentally conscious and the cost of solar technology has decreased significantly. In cities like Phoenix and Las Vegas, where sunlight is abundant, the benefits of solar energy outweigh the initial investment for many homeowners. However, in densely populated urban areas, the installation of rooftop solar panels faces challenges such as limited space and potential structural modifications._
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安装屋顶太阳能板由于环保意识的增强和太阳能技术成本的下降而变得流行。在阳光充足的凤凰城和拉斯维加斯等城市，太阳能对许多房主来说益处大于初期投资。然而，在人口密集的城市区域，安装屋顶太阳能板面临空间有限和可能需要结构改造的挑战。
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