You should have a preventive maintenance agreement with an HVAC contractor you trust. Before winter sets in is a great time to have your commercial HVAC system tuned up. You should plan to do this once per year to make sure that your system is ready for the winter months ahead. Ask your HVAC technician about your options in terms of a maintenance agreement to ensure you are getting the best service possible.
One thing that you can do during your regular tune-up is to have a technician come out to your facility and calibrate all the thermostats in the office. When you have multiple units in one building and they are all set at different temperatures, they will battle against each other. You want all your thermostats to be working together, just like your employees. When you do this, however, make sure that all employees know about the system and don’t adjust it on their own, as this will create the need to recalibrate the thermostats again.
Maybe during the warmer months you were able to put off leaks in your ductwork and failures in your system because you weren’t using the furnace much, if at all. However, this is going to be difficult to live with during the winter. Make sure you have any repairs taken care of well before you actually need to use your furnace.