If you are looking to excel in a people-oriented business, then guaranteeing their comfort should be a priority that you focus on.
This may mean first doing all it takes to make them comfortable such as investing in quality a/c.
Fortunately, there are numerous possibilities available for a commercial client, walk into any retail HVAC supplier and talk to the experts about it. You will be surprised at how willing they are to help you figure out the heating and cooling equipment for your space. The supplier may determine the installations you need. For example, equipment that works for a restaurant may not necessarily be what a convenience store needs. Either way, offering some form of a/c should be top on your list, and once you have the equipment installed, make sure you have a person dedicated to maintaining it. One of your employees can add the extra responsibility for a small increment or have part of your management handle this part, it would be best to come up with a repair schedule that they can refer to as well as have the HVAC experts come in once to examine the unit. This is the easiest and fastest way to secure and protect your investment, after all, HVAC systems are not cheap investments and should not be treated as such. Commercial HVAC systems are, in fact, more expensive and should thus be safeguarded! Repairs should be done on time, and watch out for when the equipment needs to be updated to avoid wasting energy on it when nothing can be done to improve its performance.