Before buying a major piece of equipment we suggest you check up on the contractor you are considering. Don't rely on advertising you have heard or the size of the company. Sometimes companies that do large scale advertising are the ones you should be careful of. While some companies spend considerable money on radio, TV and sponsorships, we rely on word of mouth and repeat business. Here are a few independent consumer sites you might want to take a look at.
Better Business Bureau
The BBB lists company complaints for the previous 3 year period. Some local a/c companies have 5 or 10 complaints, some even more than that. A good company should have no complaints at all. In our 30 years of service Spencer has never had a complaint. Our BBB rating is A+ (the highest possible).