Just because it's the end of the winter season doesn't man that you should just stop doing any maintenance on your furnace. At the end of the season you should button up your furnace to ensure it is in good working order when you need it for the next cold weather season. You'll also need to do a few things prior to the warm weather season when you'll be using your air conditioner.
The heating, air conditioning and ventilation (HVAC) system is a critical component of any commercial facility. If you don't have a working HVAC system, you'll find that it's nearly impossible to appease your customers. Because your HVAC system is going to play such an essential role in determining whether or not you're able to create a comfortable indoor environment, you should give special attention to the type of unit that you select.