I did a search and did not really find what I was looking for so here goes.
I have a Rheem 2.5 ton unit that is approx. 17 years old and I believe either a 10 or 10.5 seer. I still have a home warranty that I am keeping up to date mainly just in case this unit goes out. It has already had the coil replaced in the air handler around 10 months ago. A few months ago I had to go outside and I guess reset the outside unit, it was making a buzzing noise but no cooling, by pulling the big fuse on the breaker box on the outside of the house.
With this unit being as old as it it, and it starting to have problems should I really look more into getting it replaced? Is there any way to know about how much I might be able to save with a new unit that is say 16-18 SEER?
If I need a new unit, are the variable speed options worth a little extra cost?
I am in North Florida and the house is just less than 1500 sq. ft. Util rates are 0.099 per kw hour.
Thanks for all of the help.
PS: I am not looking into having a new unit that will pay for itself but if a new unit is only going to save me like $5 per month then obviously I will wait until the unit just dies on me.