Your home’s HVAC near Seattle plays a significant role in keeping your family comfortable while indoors. If you’re wondering if you should replace your current system, then there are a few warning signs to keep in mind: 
It’s getting old.
On average, heating and air conditioning units are designed to last about 10 to 15 years. As your HVAC system nears the end of its lifespan, it may have decreased efficiency and require more frequent repairs. If your system has reached the 10-year mark, then it may be time to pay more attention to its function to determine if it’s running as well as it once did.
It doesn’t work efficiently.
Have you noticed an increase in your monthly utility bills? If so, then your HVAC system could be at fault. Sometimes, maintenance and repair are all that’s needed to get a unit working well again but, in other cases, replacement is the better option. Also, if your boiler, furnace, or air conditioner are running for longer periods than they once did, then this can be a sign that it is time to consider replacement. When your HVAC system is running for long periods, this means that it is not cooling or warming your home as quickly as it once did. In turn, the longer that it runs, the more energy it requires, which can result in higher energy bills. If you’re ready to enjoy an HVAC system that runs efficiently, then think about replacing your old one.
It doesn’t keep you comfortable.
As HVAC systems begin to fail, they usually struggle to keep the entire home at the right temperature and humidity level. A few signs that could mean that you might benefit from a new HVAC unit include increased or decreased humidity levels, odors or noises while the system runs, and uneven cooling or heating throughout your home. Also, if the unit runs continuously and still fails to reach the set temperature, or if you frequently adjust the thermostat to try to feel more comfortable, then it may be time for a new HVAC system.