What is the weight of freon in a typical home central HVAC unit?

There is NO typical home central hvac unit. Like fingerprints, all units are created differently. The efficiency (or SEER) varies greatly and the TONS of cooling do to. Between those two intangibles you can vary from about 2 to 8 Lbs. of "freon". There is NO typical home central hvac unit. Like fingerprints, all units are created differently. The efficiency (or SEER) varies greatly and the TONS of cooling do too. This creates two intangibles that cause the refrigerant level to differ quite a bit. Smallish units with a high efficiency rating can be as low as 2 lbs. A large 5 TON system can take as much as 8 lbs. Hire and trust a good HVAC mechanic.