In conclusion, the most environmentally friendly way to heat your home would be through the use of renewable energy sources such as solar, wind or geothermal energy. Biomass boilers and passive solar home designs are also environmentally friendly and sustainable heating options.

The system also alters the operation of your Toyota's air conditioning system. It reduces the energy used by the HVAC (Heating, Ventilation, and Air Conditioning) system, which can be a significant consumer of engine power, especially in extreme weather conditions.

Gas central heating is generally more cost-effective compared to electric heating options. Gas prices tend to be lower, resulting in potential savings on your energy bills. It's worth comparing the energy costs between gas central heating and other options to see which one aligns better with your budget.

Geothermal Heating. The U.S. Environmental Protection Agency (EPA) cites geothermal heating as the most environmentally friendly and efficient among other sustainable heat sources. Generally, a geothermal heating system functions by using warm, underground temperatures to heat your place.