The age of your furnace or air conditioner matters in your decision
If your furnace or air conditioner is 10 years old or older, it may be time to start thinking about upgrading.  There have been several technological advances over the past decade that have increased both the energy and operational efficiency of the units. Today’s models can help you save on operating expenses, are better for the environment and deliver better overall comfort.
Some recent furnace and air conditioner advancements
Here are just a few of the things that have changed over the years:
All residential gas furnaces must be condensing as of 2009.
As of December 19, 2019 the minimum AFUE ratings for residential gas furnaces was raised to 95%
The requirement of DC variable speed or ECM blower motors in all furnaces as of July 3, 2019
Minimum SEER ratings for air conditioners of at least 13
The introduction of variable speed compressors in central air conditioner systems