Why should I consider spending substantially more for the high-efficiency units?
The difference in energy savings between the equipment with the lowest efficiency available and energy efficient equipment can be up to 30 percent. Your local utility company should be able to calculate your annual energy savings and this should aid in making a purchasing decision.
However, you may want to consider the environmental impact inherent with energy efficient equipment, and/or other incentives, such as a better warranty, quieter operation, better humidity control, and rebates offered by some utilities.
Just be sure that you don’t quickly overlook all the benefits of energy efficiency and make a decision based solely on the system’s initial cost.