What of these is not a smart strategy to save energy and costs in new and existing homes?

One strategy that is not effective for saving energy and costs in new and existing homes is relying solely on traditional incandescent light bulbs. These bulbs consume significantly more energy compared to energy-efficient options like LED or CFL bulbs, leading to higher electricity bills. Additionally, they have a shorter lifespan, requiring more frequent replacements, which can increase overall costs. Investing in modern lighting solutions and energy-efficient appliances is a much smarter approach.