Time to start replacing my units, central air conditioning and forced air gas heat. I know a guy who can help me with the installation but I'm just wondering what i can expect in terms of cost of the units. Anyone have any ideas or suggestion on where to buy, or where not to buy the equipment? Not sure on the specs of what i currently have but my house is approx. 2,000 sq. feet livable space, 2 story with a full unfinished basement and full attic, and it is zoned, upstairs and downstairs each have their own furnace and compressor. I'm only looking to replace the downstairs units at this time. I'd estimate the units are probably 20-25 years old so I'm not too concerned with efficiency as i think anything would be an improvement. I'm also hearing that the new popular thing is for people to steal the A/C compressors. I'm assuming this means there is some value in them? Is it worth a trip the the scrap yard? Any help would be greatly appreciated.