Problems with HVAC systems come in many forms: design, improper installation, or poor maintenance. Planned maintenance is the best preventative insurance a building owner can purchase. Regularly changed filters keep airflow at optimal levels, while protecting the duct from dust particles and creating a healthier environment for occupants. Regular check ups of refrigerant levels, belt drive, etc. assure lowest operating cost and help to protect against expensive failure of equipment and building HVAC system downtime.