My stupid A/C for my upstairs is leaking refrigerant again. It's a chronic problem and I just paid to have it filled with 4lbs and it's leaking again. It's 5 years old but don't know where it's leaking. Leak test is about a thou. plus repairs. It's been a money pit. I'd rather put that money towards a whole new unit. Estimate I have for the Legacy series Bryant 3 ton is $5300 for the A/C, line set, and coil. It's $10,000 to replace everything with a new A/C unit and furnace. 92% efficiency furnace and 14 SEER on the A/C. Furnace is 17 years old. I'd only get the A/C replaced but every time I don't for full replacement on this HVAC, it winds up costing me more in the long run with repairs. Any advice?