HVAC Replacement

Hi all.

Can anyone recommend a contractor for this? My unit is from the early 80's.
It's still working but very noisy and more than likely inefficient. Also kind of curious about what it might cost if you've had this done recently.

Some firms I found were:

A & W cooling
PAM Air
Phil's AC
Sam's AC

Anyone had a particularly good experience with any of these companies?

Thanks.

Don't putz around here with a question like that go over to the Brownstoner forum.
http://www.brownstoner.com/forum/

i used Arnica HVAC a few years ago and was pretty satisfied. I did however, do my homework. I checked with the BBB and the NYC Consumer Affairs for their license and insurance verification. Two things you should do no matter who you hire. DO NOT go with Sears. They are the fucking worst of the worst.

http://www.bbb.org/new-york-city/business-reviews/heating-and-air-conditioning/arnica-heating-air-conditioning-inc-in-staten-island-ny-57691/

https://a069-webapps12.nyc.gov/dca_new/biz_brow.cfm?nameField=Arnica&Search=Search&License=&catid=3

Thanks for the help fellas.