13 SEER will save you from 15% to 20% annually?
Or $231 - $308 Based on Total electricity cost for last 12 months $1,539.65 (This is excellent for AZ)
Was cooling/heating master bed room (Close Vents for other area) keeping 83 F in summer & using electric heater

I live in Arizona in 1916 sf house high ceiling built in 1986 – 25 years ago still with original AC Carrier 48KHA, KLA. Gas heater stop working 2 years ago and now start working again

Does it make sense to replace AC (Carrier 48KHA, KLA) with 13 or 14 SEER?

TRANE AC
13 SEER XL13 MOD#4YCX3048
APS Rebate ($175): 13-13.99 SEER, 10.8 EER installed by APS Rebate Eligible Contractor
PRICE INCLUDE INSTALL(after rebate $175 ) $4,197.00

Or

14 SEER XL14C MOD#4YCY3048 14-16.99 SEER, 10.8 EER
APS Rebate ($425): 14-16.99 SEER, 10.8 EER installed by APS Rebate Eligible Contractor AND
Tax Credit: System qualifies for $300 tax credit (based on SEER/EER/HSPF)
PRICE INCLUDE INSTALL (after rebate $425 ) $5,799.00 - $300 tax credit