Would you be surprised to know that only half of the new Air Conditioning change outs on homes in the Las Vegas Valley really needed to be replaced. Most of the time the AC can be repaired for far less. It's true and those unsuspecting soles that pay for it are keep unscrupulous air conditioning contractor companies in business. Now don't get me wrong there are many advantage like a warranty that make buying a new Air conditioner a good Idea. But don't be confused. The same technology from 20 years ago is still used today in the design of new air conditioning units. Yes the components of your home's HVAC get tired and worn out but most of them can be replaced. And you don't have to replace the whole air conditioner. 
So don't get sold on the efficiency of a new air conditioning unit or lower power bills for your home. Unless you upgrade the SEER rating of the replacement AC unit it won't change your utility bills. If you have multiple components fail on your home's HVAC unit you are probably better off to replace rather than repair. If you take care of your AC unit and have it serviced once a year you can look forward to the next 25 years together. 
If you do need a new air conditioner for you your Las Vegas home or just an air conditioner condensing unit, shop around. There are dozens of home air conditioner manufactures that sell in the Las Vegas, Henderson and the rest of the United States. Consider warranty as the most important factor when you buy a new air conditioner for you home. http://quickandeasyhomeandgarden.blogspot.com/2015/09/new-air-conditioner-or-repair-you-choose.html