If your central air conditioning unit is more than 10 years old, replacing it with an ENERGY STAR® certified, high-efficiency model could cut your cooling costs by more then 30% percent.
Installation is more important than the brand itself.
Without a proper installation, your heating and air conditioning system will never realize it's maximum efficiency, and will tend to have a shorter life span then those systems installed by properly trained industry experts.
Be sure to ask about different financing options, such as no interest, or low monthly payments, and some that provide a tax break.
Each part of your heating and cooling system should be inspected, cleaned, and given a tune up once a year. Catching minor issues in the early stages can save you thousands of dollars. It is always recommended that your heating system maintenance be performed in the fall, and your cooling system maintenance be performed in the spring.
Properly sized ducting, that is sealed, insulated, and installed correctly can help save an additional 15% or more on your energy bill. Proper ducting can also help provide better airflow and comfort to your home, while prolonging the life of your heating and cooling system.