Agree on changing the whole unit. Just did it in March. Went with a Trane XL20 with two compressors (2Ton and 4Ton). Didn't know how much more efficent the new unit is until I got the electric bill in for July. From last year to this year spent right at $125 less and that is with the temperature set at 70 at night instead of 75 like last year.
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