Most houses that were built a few decades ago came with old-school HVAC systems that have since grown to be inefficient and ineffective.
However, a few grandmas and grandpas were so diligent in their maintenance practices, that these old systems still work.
For instance, an old boiler is likely to serve its heating purposes even today, especially if it was made from corrosive-free material and can still heat up and warm the entire house evenly. However, even the best gadgets and machinery wear out with time and slow down their performance. This means that no system is as good as it was during its formative years. After a few years, say a decade and a half, HVAC systems begin to experience multiple issues that require constant repairs. Consequently, homeowners need to be smart about what to do next and avoid making unnecessary decisions that lead them to waste money. Instead, it is advisable to find out from your HVAC contractor if repairing is the best option. There is a high likelihood that a competent technician will advise on upgrading the system. Sadly, most old folks insist on having their old school units even after they have had them for more than 50 years. This is a waste of resources and energy since the bills will keep going up.