When your office is too hot or too cold it can be difficult to work. That is because when the temperature isn't just right the body has to spend energy to compensate. That is energy which could be better used for the task at hand. Upgrading your HVAC system is not only good for saving money on your utility bill but is also necessary to make sure you and your employees can be as efficient as possible. Remember that if your system is working poorly then up to 50% of your utility bill can be because of your HVAC system.