Question: what is the difference between 16 seer and 18 seer?
Answer: Energy savings of 18-SEER vs. 14-SEER. FPL estimates that the energy savings between 14-SEER and 18-SEER is $160/year (assuming both are 3-ton units). ... Assuming you qualify for the $300 federal tax credit with the purchase of the 18-SEER unit, the overall difference is reduced to $2,200.