How much to purchase and install central air conditioning?

I have an 1800 sq ft. split level.
House already has ducting for gas forced air heating.
Can anyone give me a very rough guess as to how much I would be looking at for purchase and installation?

Answers:
Rough guess, about $3000-$5000. They have recently changed the requirements for heating/cooling efficiency so everything has gone up but if you have the ducting in place it will cost less than a completely new installation.

Other answers:
It depends on a couple of things but if you already have the duct work you are halfway there. You will get quotes anywhere up to $5,000.00 or more. If you know someone in the business as I do, you can get it done for as little as $1500.00.
It depends on a couple of things but if you already have the duct work you are halfway there. You will get quotes anywhere up to $5,000.00 or more. If you know someone in the business as I do, you can get it done for as little as $1500.00.
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