When consumers pay for new appliances, they usually have several options with various features and vigour-consuming characteristics. Energy-efficient equipment is designed to care for a given level of energy services such as heat, upbraid, or refrigeration using less energy and thus at a lower energy rate. But in most cases, equipment that is more efficient also costs more. Because of this, consumers must weigh expected dash savings against the up-front incremental costs of more efficient equipment.
In most cases, the relationship between effectiveness and added cost is not linear. For refrigerator-freezers, an efficiency change for the better of 20% over a baseline model with similar features might add $50 to the achieve price. Increasing efficiency beyond that is nonlinear: a 25% more thrifty model might be $100 more expensive, and a 30% more efficient miniature might be $200 more. Buying the most efficient model available could price more than $250 more for a 30%-35% increase in efficiency above the baseline standard.