Actually the ac company "ICS" did air conditioning work 2 years ago for the office I work in Chelsea. The owner of my company always claims that they are the only good company he continues to have a relationship with after the construction. Anytime there is a problem they respond ASAP - I know, I'm the one who has to call them.
I don't know what you plan to do at your house, but from what I know I would definetly recommend this company.
Good Luck!