HVAC Replacement - Help finding companies

[Terry R.]

I may very well need to replace 2 HVAC units in my Dallas, TX duplex. I need recommendations of who to use for estimates and to make a smart decision. Each company I call is charging $200+ just to come out. To get 3 quotes will cost me $600. The first quote I got from one of the big name area franchises to repair the units is:

Unit 1: (1900 sq/ft) - Dual Capacitor is weak and Condensor Fan Motor leaking oil. System low on Freon.

Condensor Fan Motor = $350

New Dual Run Capacitor = $283

Unit 2: (1900 sq/ft) - System low on Freon R-22. Freon swells burnt. System needs replaced soon

Add Freon R022 = $306

Total cost to repair both would be $939.

Cost to replace each system with Trane XL16 straight cool up flow 3.5 ton = $6808 each. I assume this price does not include replacing duct work. I don't know how good or old the duct work is.

Help! Need some folks to come out and provide quotes at a reasonable cost.