HVAC specialist for commercial real estate. A HVAC system can be detrimental to keeping or losing your tenants. If your system is not maintained or has been neglected by building maintenance engineers, there is a chance you can make a counter offer to your real estate deal. I will give you a check list of items to be looked at before making those big purchases. Trust me I have seen commercial buyers get wrecked because the building’s HVAC system is not what they were told. Commercial HVAC systems can cost hundreds of thousands of dollars depending on what is wrong and what needs to be updated to help provide better maintenance in the future.