You did not say what the problem was diagnosed as but I suspect that your service technician is going to change the compressor and dryer. This unit even only 7 years old is a R22 unit which cannot be sold anymore. It is also only 10 SEER where new models are a minimum of 13 SEER (produces 13 Btu's per kilowatt). If you installed a new unit the coil in the duct will need to be replaced along with the outside condenser. If the cost of a new one is $1000 or less over the cost of repair, I would go with a new system.