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The standard for newly installed air conditioners has changed from SEER 10 to SEER 13: a 30% increase in efficiency. However, for many with older homes (pre-1992), the increase in efficiency can be even greater than 30%, due to the older units much lower SEER ratings--usually around 6 or 7. Thus the "payback" will be even bigger, and faster, and the reduction in electricity costs will be even nicer!

Initially, the up front costs for the new SEER 13 units are going to be higher than the SEER 10 units. Talking with a well respected Atlanta HVAC firm who represents several well known brands, the representative noted the price difference between a SEER 10 and a SEER 13 two-and-a-half ton unit, including the cost of a matching evaporator coil (if needed) would range about $600 higher on average.

There may be additional costs for sheet-metal work around the new, larger sized evaporator coil at the furnace, possibly new copper tubing from the compressor to the evaporator. The new units require very clean plumbing, so the current plumbing may need to be cleaned or replaced. The new units required 40% more "freon".

There has been much speculation about how much larger the new outside units will be. Actually some manufacturers like Amana, Goodman and Bryant (and perhaps others) new units will be the same or smaller than their current SEER 10 units.

A new digital thermostat is recommended if your unit is an older, say 15 year old analog thermostat, for more efficient operation.

And, just like car a/c systems where the old R-12 was changed, in 2010 the current R-22 air conditioner coolant will be changed to the R-410A. At least one manufacturer, Carrier, already includes the new freon, so you‘ll already have an a/c that meets the SEER 13 requirements with the new coolant