which one is better to install as an A/C system.?

CARRIER-USA
TRANE-USA
YORK-USA

the price are nearly the same.

Answers:
One answer was:

"I prefer and have a Carrier A/C unit. Never had a problem since I installed it ten years ago.
Carrier has copper coils inside
I believe Trane has aluminum"

FACT: Carrier (and the rest of the industry) uses copper tube/aluminum plate fin OUTDOOR coils. Trane uses aluminum OD coils. If you live near salt water you will want the aluminum, other wise, be prepared to replace the coil in a few years. Also, the spine fin design of the Trane coils gives better heat transfer. Everybody uses Cu/Al plate fin indoor coils.

Another answer was:

"I like the Emerson scroll compressors (Copeland Division) used in the York, Lennox, Ruud and other units because they are a more standard design when parts replacement is needed."

FACT: Carrier and Trane use the Emerson scroll compressors also. Also, scrolls require more protection against refrigerant flooding than recips because the scrolls have smaller free volume to handle upset conditions that can occur. However scrolls are quieter than recips. Nobody is going to replace a PART on your compressor should it fail - they will replace the entire thing. Personally, I would take a recip for better reliability.

Another answer was:

"It really doesn't matter! A/C is a very mature technology and differences between brands are minor."

FACT: Designs vary significantly from manufacturer to manufacturer, as does the reliability. Some have sophisticated designs and better quality parts while others are very simple with lower quality parts. Believe it or not, not all parts are made in China or Mexico.

In a nutshell, I prefer Trane.

Other answers:
they are all good you should look at the differences and energy usage to determine the best fit for you.
they are all good you should look at the differences and energy usage to determine the best fit for you.
Flip a coin then. All three are reputable companies. The decider may be the warranties!
Well if they are the same price, I'd check to see which one runs the cheapest.
Compare the warrantees too.
Also, the reputations of the dealers if different for each.
I prefer and have a Carrier A/C unit. Never had a problem since I installed it ten years ago.
Carrier has copper coils inside
I believe Trane has aluminum
We just got it installed and the guy said Carrier and Trane are the best. We ended up going with Trane and it's doing fine. Check into any differences in warranty between the three. That can make a huge difference down the road.
I build a couple of houses a year to sell. I installed york and had alot of problems with them. I switched over to Lennex and have had 0 problems they make very good equipment at a fair price. Check with your local power company and see if they offer any rebates if you install some certain equipment like a heat pump I get 500 back for everyone I install.
I like the Emerson scroll compressors (Copeland Division) used in the York, Lennox, Ruud and other units because they are a more standard design when parts replacement is needed. The Lennox unit has an automatic electronic diagnostic module that helps the HVAC technician diagnose and repair the system. Above all, you should choose R410a over R22 refrigerant because R22 is rapidly being replaced by the environmental friendly R410a, and you get heavier duty components due to the higher pressures that R410a uses.
I live in a suburb of Atlanta, GA and have a Trane installed. It gets pretty hot here (100deg today) I LOVE IT! Nothing stops a trane! My house is split level, I bought the one that accommodates 1100sqft. I highly recommend this brand.
It really doesn't matter! A/C is a very mature technology and differences between brands are minor.

What *does* matter is the contractor that is installing the system.

I'm assuming you've gotten three different bids so go with the contractor you feel most comfortable with. Think of it this way: You are buying a long term relationship with the company that is going to be servicing the system, when/if you have a problem are they going to be there to fix it? Ask them if they're including a pre-scheduled appointment to tweak the system after installation since that is normally needed to rebalance the system! If the answer is no that's a checkmark against them.

If you really want to drive 'em nuts and find out who's honest ask about having "scratch and dent" equipment installed! These units are fully warranted by the maker and cost is usually half of a 'perfect' unit. Labor rate won't change but your cost will go down.
(and the crooks use them anyway but charge you for 'perfect')
they all three have a good reputation but I think you can get more bang for your buck with a American Standard they are cheaper than a Trane but about the same in Quality
I would choose based on warranty and service. We just got a new Trane SEER 13 system (less duct work), there were some minor problems but the contractor came out and took care of them right away.

Trane followed up with a questionaire to see how we liked the equipment and the contractor.

We got the 10 year parts and labor warranty.
be sure to check warranties. plastering around plugs?
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