Heat pump systems are becoming more popular as they are more environmentally friendly than other types of heat systems. They use the heat of the earth to help heat your home. They save you energy dollars and don't rely upon fossil fuels that are non sustainable to operate them. Since heat pump systems don't burn anything to create energy or heat, there is no carbon monoxide present. Because of this, you will not need a carbon monoxide monitor. Heat pumps are a very safe way to heat a home as there is no gas hooked up to the unit and no open flame or ignitors to worry about.