According to leading consumer and trade magazines, the US Department of Energy, the heating and cooling contractor you choose does make a difference. The same equipment can be installed in the same home by two different contractors, and there can be a difference in comfort, equipment efficiency, and overall life. 

Workers who are independent contractors, meaning they are in business for themselves rather than economically dependent on an employer, do not have to be paid according to the requirements of the Fair Labor Standards Act. To determine whether the worker is an independent contractor or an employee, factors to consider include: 1) The extent to which

Most ceiling tiles are made from mineral fiber, but other materials are available, such as fiberglass. Mineral fiber tiles typically have a high Noise Reduction Coefficient (NRC), which means they are good at absorbing sound within a space to prevent echo or loud environments.