I'm wondering how you like it? Any problems?

How much money does it save you over your old unit in energy costs?

People might enjoy reading these posts and it could help promote energy efficiency as people may be more likely to buy the highest energy efficient equipment.

for example Bryant Evolution / Carrier Infinity systems:

There is a group of 15 of the best assemblers in the Bryant/Carrier plant that put these heatpumps/AC together. All other systems are built on a assembly line.
The parts used on the systems are top notch,
They are built better and they are more quiet.
These systems are data controlled systems so they communicate with each component to maximize the comfort level.

The compressors are 2 speed scroll compressors.

~ 3 Ton - 1 stage speed(low) runs about 5amps and high speed around 10amps. The system will run about 80% on low speed and will take out humidity with more precision.
Low speed cost around 15cts an hour to run.

After analyzing around 50 installs the average utility cost (heat pump) was $47 a month to run the air conditioning system in my area.

The thing is, if you are going to purchase a air conditioning system. Hopefully the contractors you choose will offer and explain to you these systems.
If they don't then they are not very good companies.
The should offer the best! Then see if they can fit it in your budget.

As a customer you want the best you can afford and should look into the top systems.

as stated above..savings depend on what you start with
(8,10,11 Seer..) and what you upgrade to.
electrical rates also factor into savings.
but just the kwh usage, not additional fees.

best of luck

I still believe 15 SEER and 12.50+ EER is about the sweetspot for AC efficiency and up front and operating cost. The jump to two stg and higher efficiency comes with a cost that may not have a reasonable payback.

IMO