Thanks for the input everyone. The technician did show us a picture of the evap coils. They were rusty. He said there was oily residue all over them. I did/do believe him in terms of the diagnosis. If this had happened around a year and a half ago a warranty may have covered the coil itself. I did Google around about the prices and also called a few other other places and they agreed that seemed high for refrigerant. When I talked to the other shops they did say that price for 8lbs was high, but within range for R22. When I told them that the unit is spec’d for R410a, they did say that was well over what they were charging. They did say that the rust in and of itself was not necessarily a warning sign. They said I would see rust on new coils within a year. The oil and obviously loss of cooling capacity were bigger indicators. With that info, I called back the company that AHS sent out. I told them I wanted them to clarify whether the estimated cost was for R22 or R410a. He said it lines up with their R22 charge. He said 8lbs of R410 would be about $760. He confirmed that AHS would cover the cost of the part and labor. They cover the first $10/lb of refrigerant and I would be responsible for the rest of the refrigerant charge. Regarding the discrepancy in listed capacity vs what they quoted (4.8 lbs vs 8lbs), he mentioned evacuating and drying the system and applying additional vacuum. He said it was not uncommon to lose some in this process even with their recovery equipment. He did mention distance of the run to the “inside coils” needing an additional amount, as well. However, this is a gas package unit with the “inside coils” actually I’m the outside unit. I am bot sure their is almost 3lbs of difference. The thing that bothers me is I asked for another sheet with the corrected price. He said I didn’t need another. That this was an estimate for AHS and that AHS would give me the final total upon authorization. This sends up a red flag for me. However, a couple of the places I called that were willing to give a rough ballpark figure for replacing the coils and recharging said $1800-2000+. I figure at this point, even if they were to charge me $1200 I would still be out ahead.