ECO mode regulates climate control, power output, and seat heating. This mode reduces power demands on the engine and increases fuel efficiency.

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.