Your HVAC system is one of those unsung heroes in your home. When it’s working well, you hardly notice. When it starts to falter, it becomes a big problem. Your HVAC system is responsible for keeping your home comfortable, no matter the temperature. If you find that your home is too cold in the winter and too warm in the summer, it’s probably time for some HVAC maintenance. Knowing whether to repair or replace your HVAC when it’s malfunctioning is important. This can involve a professional evaluation and some checks you can do, too. Always check with a trusted pro before you decide to repair or replace your HVAC unit to save time and money. But here are some general tips for how to know whether you can give your HVAC unit a tune-up, or it’s time to get a new unit altogether.