The answer to 'which is better system upgrade or' is that it depends on your specific situation and needs. In general, upgrading your HVAC system can provide more energy efficiency, improved comfort, and better indoor air quality, but it also comes with a higher upfront cost. On the other hand, a system upgrade may not always be necessary, and making targeted repairs or upgrades to your existing system can be a more cost-effective solution.
When deciding between a system upgrade or targeted repairs, consider factors like the age and condition of your current system, your energy usage and utility costs, and your desired level of comfort and efficiency. If your system is older and less efficient, an upgrade may be the better long-term investment. However, if your system is still functioning well, targeted repairs or upgrades may be a more practical and affordable option.