Name a renewable energy source that can complement HVACR systems.

Solar energy is an excellent renewable energy source that can complement HVACR systems due to its ability to provide clean, sustainable power. Solar energy can be harnessed through photovoltaic (PV) panels, which convert sunlight directly into electricity. This electricity can be used to power HVAC systems, reducing dependence on fossil fuels and lowering greenhouse gas emissions.

Additionally, solar thermal systems can be used specifically for heating applications, such as providing hot water for domestic use or heating water for hydronic heating systems. By integrating solar energy into HVACR systems, buildings can achieve greater energy efficiency and sustainability, thereby reducing energy costs and promoting environmental responsibility.

In contrast, natural gas and coal are non-renewable energy sources that contribute to greenhouse gas emissions and environmental degradation. Wind energy, while renewable, may not be as directly applicable to HVACR systems as solar energy due to the variability of wind generation and the challenge of directly using that energy in most HVAC applications. Therefore, solar energy stands out as the most effective and beneficial renewable source for enhancing HVACR systems.