25 years old...closer to a 9....particularly if its a Rheem/Ruud, York, or Carrier...
In all honesty, if your AC guy can figure SEERS on units that old, he needs to be able to also show you a cost comparason on the various SEER ratings on his units, and how much you can save based on your current electrical costs.
Nope. Todays units are not like your older units, and unless you are getting a new evap coil, and furnace to go with it, you wont get near 12 SEER, and if you are using the old evap coil, you can be stuck with worse than what you had. As far as run time, many units are designed to run up to 80% longer and use up to 70% less power than the old unit its replacing, when the units replaced properly, and the duct system, and complete unit is installed correctly.
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