Jaguar X air conditioning units are available online for between $300 - $400. Of course this doesn't include the hoses, couplings or the coolant and labor to install it. You should be prepared to spend $1000 more or less.
The cost of replacing an A/C on a Jaguar will range from $300 to $450. This figure is inclusive of the A/C itself as a spare part. The overall cost varies greatly on the expertise of the manpower that you get as well as the price range of parts at the store that you decide to make your purchase.