I'm in science class and need to know what they offer and how they are different
An energy efficient home is in reality no different that a regular home.
The energy efficient home just uses less energy and takes less energy to maintain.
The home may be designed and built to take advantage of the wind in order to reduce air conditioning cost, it may have a white roof to reflect heat.
The house may built out of thermo insulated panels to help keep it warmer in the winter and cooler in the summer.
The house may have skylights to reduce the need for electric lighting.
A house may have fluorescent or led lights to reduce electric use.
The house may have radiant heat in the floor to reduce the need for natural gas.
The house may have solar panels or a wind turbine to create some of it's own electricity.
The house may have double or triple paned windows to reduce heat loss in the winter and keep more heat out in the summer
The point is that energy efficient houses are designed and built in way that will reduce the amount of energy needed to run and maintain a suitable living environment.
But any house can be turned into an energy efficient house with a little hard work