I have an 11 yr old 4 ton comfort maker...8 seer?..The compressor has gone out, tripping breaker etc..HVAC guy, who I do trust and have used for several yrs..has ckd everything out and says compressor is bad. To replace compressor he says it is about $1200, a new 14 seer American standard w variable speed motor and some additional duct work(since old unit is horse shoe type and new wouldnt be) is about $5,700.
I'M NOT asking about bid/price etc..rather is there a rule of thumb or formula that can be used to see if one way or the other is best?..
Also in general is there a rule of thumb about how to calculate how much savings is realized per seer unit..ie the difference b/w 8 and 14.. how much in general would that save per month?..I know it depends on what part of country etc..Im just looking for ball park..I live in TN
Thanks for the help