There will be wear and tear, as with everything, including the human body.
HVAC systems will require tune-ups from time to time, but if it needs an expensive furnace/heater repair, it is wiser to invest in new HVAC equipment, especially if it is more than ten years old.
Even if you fix the mechanical issues, bringing aging, for instance, the furnace back to peak efficiency, is almost impossible. The equipment has to work harder, breaking down more often, and you fall into a vicious and costly cycle. A new heat pump may cost a lot initially, but it will save you money on future repairs and your energy bills and help with indoor comfort. You could save a substantial percentage on your energy cost by upgrading to a unit with new HVAC technology. The other thing that may spell out disaster for your device is the sounds coming from it. A hum when the system is running is okay, but when it turns loud and aggressive, it could indicate a severe malfunction. A unit will often need help to provide quality heating. The temperature inconsistency could result from various issues such as a damaged or faulty thermostat, low fluid levels, clogged furnace filters, cracked ducts, or severe motor damage. Another problem is if you are experiencing poor indoor air quality. All cooling and heating devices need regular HVAC maintenance done by an HVAC technician to run efficiently, prolong their lifespan, and avoid the problems mentioned above. If you have noticed some of these issues, contact your HVAC company immediately and have an HVAC repairman fix the underlying issues. Please do not wait too long to fix it because the longer you delay, the worse the problem gets. When you learn more about heating, you realize that heat pump service is non-negotiable to achieve a comfortable home.