How Long Does a Commercial HVAC Unit Last, and What Shortens the Lifespan

Most commercial HVAC units last 15 to 25 years, depending on the equipment type, how hard it runs, and how consistently it’s been maintained. Rooftop package units typically fall in the 15-20 year range. Chillers and larger built-up systems can push 25 years or more with proper care. If you’re looking at a 12-year-old rooftop unit and weighing repair versus replace, you’re not being paranoid — that’s a reasonable time to start planning.

Lifespan by Equipment Type

These are realistic ranges based on real-world use, not manufacturer marketing:

Rooftop package units (RTUs): 15-20 years. They take a beating from weather exposure and often run long hours in commercial applications. The 15-year mark is when you should budget for replacement even if the unit is still running.

Split systems (commercial): 15-20 years for the condensing unit, potentially longer for the air handler if it’s well-maintained.

Chillers: 20-30 years. More expensive to replace but also more likely to be worth repairing because the components are modular and serviceable. Centrifugal and absorption chillers tend to reach the higher end of that range; reciprocating units trend lower.

Boilers: 20-30 years with consistent maintenance. Cast iron units can outlast that; electric boilers tend to fall short of it.

Cooling towers: 15-25 years, highly dependent on water treatment quality and construction material.

VRF/VRV systems: Most manufacturers and industry sources put the expected service life at 15-20 years. Real-world data on the oldest commercial installations is still limited.

What Actually Shortens the Lifespan

Deferred maintenance is the single biggest factor. A unit that misses coil cleanings, filter changes, and refrigerant checks will fail years earlier than one that gets annual service. Here’s what I see most often:

Dirty coils. Condenser coils clogged with dust, cottonwood, or grease from nearby exhausts force the compressor to work harder than it should. Sustained high head pressure wears it out faster. This is also one of the most preventable problems there is.

Low refrigerant. Running a system with a slow leak stresses the compressor and leads to oil circulation problems. I’ve seen units where the charge was off for two or three seasons before anyone noticed. By then, the compressor is already compromised.

Oversized or undersized equipment. A unit that short-cycles because it was sized wrong will wear out much faster than one that runs steady cycles. This is typically a design or installation problem, not a maintenance issue, but it matters.

Poor ventilation around the condenser. Rooftop units need clearance. If someone installed equipment or built a screen wall too close to the condenser, the unit runs hotter than it should, every single cycle.

Water quality (for cooling towers and chillers). Scale buildup, corrosion, and biological fouling in water-cooled systems cause heat transfer problems and tube damage. Water treatment isn’t optional on these systems.

Electrical issues. Loose connections and voltage imbalances degrade compressor windings over time. A cheap fix if caught early, expensive if it causes a burnout.

The Repair vs. Replace Calculation

There’s no universal formula, but here’s how I think about it: if the repair cost is more than 30-40% of replacement cost, and the unit is already in the back half of its expected lifespan, replacement usually makes more financial sense. You’re spending money to extend equipment that’s already depreciating fast.

A few specific situations where I’d lean toward replacement regardless of cost:

• The compressor failed on a unit over 15 years old. Compressor plus labor on an old RTU often gets close to the cost of a new unit.
• R-22 refrigerant. Production and import were banned in 2020, so supply now comes entirely from reclaimed stock. Recharge costs have climbed sharply as a result. If you have an older unit still running on R-22, a leak is usually the tipping point for replacement.
• Multiple failures in the same season. One repair is normal. Two or three in a year means the unit is declining across the board.

For capital planning: if your RTUs are in the 12-15 year range and haven’t had consistent maintenance, I’d budget for replacement in the next 3-5 years. Don’t wait for a mid-July failure to make the decision.

What a Tech Checks on an Aging Commercial Unit

When I send a technician to evaluate an older commercial system, here’s what we’re looking at:

• Compressor amp draw compared to nameplate rating (elevated draw indicates a worn compressor)
• Refrigerant charge and system pressures (low charge or abnormal subcooling/superheat indicates a problem)
• Condenser and evaporator coil condition (physical inspection, often with a coil cleaning if the unit hasn’t been serviced recently)
• Economizer operation (stuck dampers are common on older RTUs and waste energy constantly)
• Electrical connections and contactors (contactors on a 15-year-old unit are often pitted and ready to fail)
• Heat exchanger integrity on gas units (cracked heat exchangers are a safety issue)

A thorough evaluation gives you a realistic picture of what the unit has left in it, which makes capital planning much easier.

When to Call a Pro

Most commercial HVAC work requires a licensed contractor. Refrigerant handling requires EPA Section 608 certification. Electrical work inside the unit should be handled by someone with experience on commercial equipment. Even something like a coil cleaning on a rooftop unit involves working at height with chemicals that can damage the fins if applied wrong.

If you’re a property manager trying to figure out whether to repair or replace, the most useful thing you can do is get a condition assessment from a qualified technician before the unit fails, not after. A good tech will give you a straight answer about what the equipment has left, not just sell you a repair.

If you’re in the Bay Area, bayareahvacservice.com handles commercial HVAC service and can walk you through the repair-versus-replace decision with actual numbers.

Key takeaways

• Rooftop package units typically last 15-20 years; chillers and boilers can reach 20-30 with proper maintenance.
• Deferred maintenance, dirty coils, and low refrigerant charge are the most common reasons units fail early.
• If a repair costs more than 30-40% of replacement cost and the unit is past the halfway mark of its lifespan, replacement usually makes more sense.
• R-22 refrigerant production and import were banned in 2020, so recharge costs have climbed sharply — a leak on an R-22 system is usually the tipping point for replacement.
• Get a condition assessment before the unit fails, not after, so capital planning is based on real data.

Related questions

Written by Andrew Kuznetsov. Andrew is the founder and owner of Bay Area HVAC Service (ADRIUM Service Solutions). He holds a California Contractor License (CSLB #1136642), EPA 608 certification, and completed factory training at the Daikin/Goodman plant in Houston in 2025. He writes from direct field experience, not marketing copy.

Further reading

• Mitsubishi Hyper-Heat (H2i): How It Keeps Putting Out Heat When It Gets Cold in the Bay Area , Most people think heat pumps quit when it gets cold. Mitsubishi's Hyper-Heat (H2i) line is built to keep working as temperatures drop, which matters more here than folks expect, especially on cold mornings and up in the East Bay hills.
• Mitsubishi Mini-Split Blinking a Fault Light? What It Means and What to Do , A blinking light on your Mitsubishi indoor head is the system telling you something is wrong. Here is what the blink pattern means, the checks you can safely do yourself, and when to bring in a factory-trained tech.
• Why Your Mitsubishi Mini-Split Is Leaking Water Inside (and How to Fix It) , A Mitsubishi mini-split dripping water inside almost always comes down to condensate that can't drain. Here's what causes it, the safe checks you can do yourself, and when to call a tech.