How Long Do HVAC Systems Last? Know When It’s Time to Replace

Wondering how long HVAC systems last? Most HVAC systems will last 10 to 30 years, with an average life expectancy of 20 years. However, the type of system and other factors contribute to how long an HVAC system lasts. Keep in mind that HVAC maintenance and regular repairs can extend its lifespan, but you’ll have to replace even the most well-maintained systems eventually. 

HVAC System Lifespans by Type

The complexity and type of HVAC system you select play a big part in how long it lasts. Some have more intricate components that wear out more quickly than others. The common examples below will help give you a better idea of what to expect when it comes to lifespan.

Factors That Affect HVAC System Lifespans

The type of setup you use plays a big part in how long your HVAC system will last, but you’ll also have to consider the following when estimating its longevity.

Maintenance and Repairs

Neglect is typically the biggest culprit contributing to a system's premature demise. Regular cleaning and annual professional HVAC servicing by a local HVAC technician can significantly extend its lifespan.

Professional Installation

Complex HVAC installation isn’t a job for the average weekend warrior. Mistakes won’t just reduce the system’s lifespan; they can also compromise your safety. Calling in a certified pro means you’ll start off with well-fitted equipment that meets appropriate safety standards.

Size

One of the problems with selecting the wrong AC size or heating unit is that it won’t run as efficiently, causing unnecessary wear and tear and a reduction in lifespan.

An oversized unit that’s constantly short-cycling isn’t good for the motors, and it can lead to overheating. If it’s too small, the system has to run for much longer than it should, which puts unnecessary pressure on the components.

Brand

It pays to take advice from the pros regarding HVAC brand comparisons. Some manufacturers and systems will go the extra mile. High-quality products could run for a decade longer than budget brands that might start to crack and leak sooner.

Climate

It’s rare for systems in coastal homes to last longer than 15 years—salt exposure corrodes and clogs the system. Living in dry, dusty, desert locales can also result in a buildup of life-shortening debris.

If you live in a region that regularly experiences extreme heat (over 100 degrees Fahrenheit) or cold (below 30 degrees Fahrenheit), expect the system to need replacing sooner than in a temperate region because of how much longer and harder it has to work.

Insulation 

Your HVAC system won’t have to work as hard if you improve your home’s insulation. You’ll see savings on your energy bills and be able to use the system for longer.

It could be as simple as sealing doors and windows and adding some thermal curtains, or you could get the pros in to overhaul the insulation in your floors, walls, and ceiling.

Individual Components

If you have a heating rather than an air conditioning system, it might last a decade or so longer. Air conditioning components take a battering from moisture and corrosive chemical products.

Also, it depends on the component that is malfunctioning. Thermostats or vent hoses, for example, are often easy and inexpensive to replace. But if there is a major malfunction with an aging heat pump or the air conditioning electrics, this usually signifies it’s time for a full system replacement.

Signs It’s Time to Replace Your HVAC System

If it's getting old and noisy, you might wonder how to tell if it’s time to replace your heating or cooling system. While it might still be salvageable with simple repairs and maintenance, watch out for these telltale signs that it’s reaching the point of no return.

• Repairs are frequent and costly: HVAC repair costs average $350, but if you’re paying to repair an aging unit, it might be time for a new one. If repair costs are higher than 1/3 of the value of your current system, then your money will be better spent on a new HVAC system.

• Energy bills are higher: Newer systems work more efficiently than older ones. Older HVAC systems have to work harder, which is likely why you’re seeing higher monthly energy bills. An energy audit can give you a better idea of your current system’s efficiency.

• The AC still runs on freon: If your system is over a decade old, it may use R-22 freon as a refrigerant, which was banned in 2020 by the United States Environmental Protection Agency (EPA) for environmental concerns. Since it’s not part of newer HVAC units, its supply is low, and repairs might be harder and more costly. 

• Indoor air quality is poor: If your home remains dusty even after regular cleaning, your old HVAC could be the culprit. A high humidity level is also a sign that something’s wrong, as is mold and mildew growth. 

• The system runs on fossil fuels: The burning of fossil fuels, like heating oil, results in carbon pollution, according to the EPA. Newer HVAC systems run on cleaner energy sources, which are both better for the environment and your wallet. If you have the budget for a newer system, definitely make the switch. 

• You’re not cool/warm enough: If your system can’t seem to keep you comfy even with regular tune-ups, it could be a sign that it’s on its last legs.

• The warranty is set to expire: All good things must come to an end, and that includes warranties. Assuming you can’t extend it, you might want to shop for a new system to avoid costly out-of-pocket repairs moving forward.