What is the best central heating and cooling...

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If price is all you know and understand then any one will do. Allow me to suggest your not going to find a real deal. What you will be buying is a Dealer. Ask for references and what brands he recommends and why. If they go to price (while it is important) if this is your main concern then again anyone will do.
If you want long term return on investment on your cooling and heating equipment you need to look for answers like someone that will shoot you back a question that asks you what is important to you.
Your Buying comfort. How will the dealer your talking to be able to deliver what he is telling you? It is more important that he have a continuing education on the specific brand he recommends than how many trucks and parts and employees he has at least to me it is. Because I'm not buying the equipment direct I'm buying his knowledge and experience. You have to decide what this is worth in dollars.

Now if you are really considering this futher ask friends and neighbors who they use and how many times they have had to use them and if there are any why's associated with the service provided. It may not be a real indicator unless you see 2 or more people using the same person. Usually the fellow thats been around will not be the cheapest. But He Will Have more value built in with his price. Its his job to show you this value before you buy. Once you find 2 or 3 contractors you feel comfortable with you have to weigh what they are worth to you and why.

I sell Bryant because of price, patrs availibility, tech training on service & installation.