If you are mechanical minded you could probably recharge your A/C unit. The Tap-A-Line will work but they have a very high failure rate in a short time. Without an EPA license, you can't buy R-22 and if the unit is pre 2010, thats the refergerant it probably takes. If you use an after market replacement, you'll loose capacity(BTU's). If you hire an a/c contractor to do it, you could spend around 1/2 of what a new unit would cost. And like Doug said, unless you find and repair the leak it will all be a waste of time because it will leak out again.