The answer to 'system upgrade leaking water' is that a leaking HVAC system after an upgrade is a common issue that can have several causes. Common causes include improper installation, loose connections, clogged drains, or damage to the condensate line or pump. Symptoms may include water pooling around the unit, water stains on walls or floors, or a musty odor.
In many cases, a minor leak can be fixed with some simple DIY troubleshooting and repairs. However, if the leak is severe or the source is not easily identified, it's best to call in a professional HVAC technician to diagnose and repair the issue. They have the expertise and tools to properly inspect the system, identify the root cause, and make the necessary repairs to stop the leak and prevent further water damage.