Older units used R-22 (Freon), which is now phased out and expensive to refill. Modern units use R-32 or R-410A , with R-32 being more eco-friendly and efficient.
For residential systems, the "condenser" is the entire outdoor unit. buy ac condenser
You must match the capacity (measured in tons or BTUs) of your existing indoor air handler. A 36,000 BTU unit equals 3 tons. Older units used R-22 (Freon), which is now