When you are searching for "air conditioning," you might be surprised to learn that there are some companies that specialize in one area of this business, and other companies specialize in other services. Any air conditioning service company provides one or more products and services related to A/C. You may encounter one or more of the following in your search for a specific A/C product or service.
Air Conditioner Retailer
This type of service company just sells the units and different types of air conditioners. Every once in a while, the retailer might offer installation services, but the installation services may be subcontracted out and have nothing to do with the retailer. If you want to purchase your own very specific A/C unit, you can do that through a retailer that sells A/C appliances.
A/C Contractor/Installation Technician
This company/business is responsible for the installation of air conditioning appliances and A/C units. They often sell units to customers as part of the sales and installation process, but the units and appliances are typically ones that the contractors/technicians prefer or are paid to back by a specific manufacturer. If you do not care what brand, make, or model of A/C you have so long as you are cool and comfortable in your home or business, then you can agree to purchase your unit(s) from the contractor/installation technician you hire for the job.
A/C Repair Technicians
Air conditioning repair technicians may install cooling appliances, but more often than not, they repair the units when the units break down. Some repair technicians install, repair, and maintain units as a convenient set of services for customers. If this is more of what you were thinking about as you performed your search for an "air conditioning service company," then this is the professional and set of services that will most fit with your current needs.
A/C Spare Parts Company
This A/C related company/business makes and sells spare parts to consumers. Repair technicians, A/C contractors, installation technicians, and even retailers that sell A/C units all rely on these spare parts companies for replacement parts and accessories. If you are looking for any sort of accessory for the air conditioner you have, or your repair technician says that a specific part is needed, you can aid in the search by looking up these particular companies to see if they have the part you and the repair technician need.