Fans improve comfort, even in air-conditioned rooms, while generating less than one kilogram of greenhouse gas every 10 hours. An open fire would use about five times as much energy to heat the same room as a gas heater. While a closed wood heater is an efficient source of heat if the wood is harvested sustainably, burning wood may add to urban pollution and reduce animal habitats. Install efficient equipment Energy labels on gas heaters and electric air-conditioners help you choose an efficient model. Ensure ducts of heating and cooling systems are insulated to R1.5.
R stands for resistance and is a measure of the insulation's resistance to heat flow.
The higher the R value, the better the material will insulate. Switching off heating or cooling appliances when you go out generates less greenhouse gas and is cheaper than leaving them on low.