Not all AC service providers are created equal. It's tempting to go with the cheapest vendor, but it's better to go with an authorized service partner. A vendor that a product manufacturer recognizes as qualified to provide services that fulfill the manufacturer's criteria is known as an approved service partner. It is preferable to use an approved service partner if you want a high-quality service at a reasonable price. Furthermore, using an unlicensed service provider may violate the manufacturer's warranty.