I have been told that my air conditioner "The system unit needs to have Freon up to 8lbs to 9lbs and replace Coil Condenser.

It is a Takagi condensing unit, 199k BTU.

for Air Conditioning parts like an evaporator coil, or a condenser? 

My condensers are being stolen from my rentals at an alarming rate.

Alos there is a high efficency furnace model that will need a condensation line during the winter months you will need to figure out. 

The homeowners handyman allegedly covered up the mold in the walls caused by an AC condensation leak.

We refinished the garage, had some repair work done in the patio room and roof, had some repair work done to the HVAC & replaced the outside condenser unit.

We usually replace AC units (condenser and evaporator) for about $2,500 on an average house in Milwaukee.

Current 20 yr old AC unit is about to go out and decided to replace both AC and gas furnace units (also 20 years old).Estimate #1: recommended by a friend (RE agent, investor)$7,377: 1 yr full labor install warranty, 20 yr heat exchanger, 10 yr parts, 2 yr unit replacementGoodman GSX13 condenser 13 SEER, 3 tonGoodman GMES gas furnace 80% , 80,000BTUGoodman CAPF evaporator coilEstimate #2: google search (almost 5 star reviews, already helped with emergency capacitor replacement for the old unit 2 weeks ago on day of malfunction)$7,140: 3 yr full labor, 10 yr parts w/registrationHeil 14 SEER condenser, 3 tonHeil gas furnace 80%, 70,000BTUHeil evaporator coilWhich would you choose? 

I did a DIY mold test on the surface and there are some evidence of mold, which I think is from the condensation during the summer months.