A chiller is the single most expensive piece of mechanical equipment most property managers will ever authorize. Getting the replace-versus-repair decision wrong costs a building anywhere from $80k (wasted repair on a dead unit) to $250k (replacing a unit that had 8 more good years). Here's the six-question framework we use.
How long does a commercial chiller actually last?
Chiller service life is more variable than most people realize. Water treatment, runtime, and refrigerant leak history matter more than the manufacturer nameplate.
| Chiller Type | Realistic Service Life |
|---|---|
| Air-cooled reciprocating | 12–18 years |
| Air-cooled screw | 15–20 years |
| Water-cooled scroll | 18–22 years |
| Water-cooled screw | 20–25 years |
| Water-cooled centrifugal | 25–30 years |
| Absorption (steam or hot water) | 20–25 years |
A water-cooled centrifugal chiller with excellent water treatment and modest runtime can hit 35 years. A well-treated air-cooled screw at high runtime can die at year 12. Rated life is a starting point, not a guarantee.
The 6-question decision framework
When we're called for a chiller repair-versus-replace assessment, this is the sequence we work through with the property manager. Answer all six honestly and the decision usually becomes obvious.
The decision tree
Two or more "yes" answers usually mean replace. Three or more, replace immediately. Even a single "yes" to Question 3 (obsolete refrigerant) is often decisive on its own because the operating cost of maintaining an R-22 unit through refrigerant sourcing markets has become punishing.
Question-by-question detail
Q1 · Service life percentage
A 15-year-old air-cooled screw is at year 15 of a 15–20 year expected life. That's 75–100% of expected life. Even if it's operating fine today, you're on borrowed time and every additional year of runtime accelerates failure risk on the compressor windings and expansion valves.
Q2 · Repair vs replacement ratio
The 40% rule: if repair cost exceeds 40% of replacement cost, replace. Repair on a $260k chiller with a $115k tube-bundle replacement quote (44% of replacement) is a no-brainer replacement decision. Repair on the same chiller with a $32k compressor swap (12%) is a straightforward repair.
Repair Ratio = (Full Repair Cost) ÷ (Full Replacement Cost, including crane and disposal). Ratio > 40% = replace. Ratio 25–40% with equipment past 70% life = replace. Ratio < 25% = repair unless other questions are triggered.
Q3 · Refrigerant phase-out
Refrigerant compliance is now the fastest-moving replacement driver in commercial HVAC:
- R-11 (CFC) — fully phased out 1996. Cannot be legally sourced.
- R-22 (HCFC) — production ended 2020. Available only from recovered stock at 4–7× historical pricing.
- R-123 (HCFC) — phased out new production 2020. Existing units grandfathered but availability declining.
- R-134a, R-1234ze — current commercial standards.
If your chiller runs R-22, the economic case for replacement is nearly automatic. A single major refrigerant leak now costs $8,000–$18,000 to top up — the same leak on an R-134a unit would cost $1,200–$2,800.
Q4 · Second compressor failure
A first compressor failure can be attributed to random variance, a bad batch, or a preceding maintenance event. A second compressor failure — even if separated by years — is almost always a system-level issue: refrigerant contamination, chronic overload, incorrect superheat, or oil chemistry problems. Fixing the second failure without addressing the root cause usually produces a third within 18 months.
Q5 · Efficiency drift
A chiller's kW/ton (energy input per ton of cooling produced) is the single best indicator of long-term health. Compare measured performance against manufacturer nameplate:
- Within 10% of nameplate: healthy
- 10–20% above nameplate: aging, worth investigating
- >20% above nameplate: significant degradation, replacement analysis warranted
On a 400-ton chiller, going from 0.62 kW/ton to 0.85 kW/ton costs the building roughly $22,000 additional electricity annually. A new chiller at 0.55 kW/ton pays back its capital cost in ~7–9 years just on electricity savings.
Q6 · Structural corrosion
Tube-bundle corrosion, cracked shells, or perforated evaporators are not economically repairable. If any of these are present, the chiller is at end-of-life regardless of runtime or age. Corrosion assessments require an eddy-current test — insist on the report before authorizing any repair over $20k on an aging chiller.
The replacement cost picture in 2026 GTA
For anchor numbers, current installed replacement costs in the GTA:
| Chiller Type & Size | Installed 2026 Cost |
|---|---|
| Air-cooled screw, 100 tons | $110,000 – $170,000 |
| Air-cooled screw, 200 tons | $180,000 – $260,000 |
| Air-cooled screw, 300 tons | $240,000 – $340,000 |
| Water-cooled centrifugal, 400 tons | $310,000 – $480,000 |
| Water-cooled centrifugal, 750 tons | $520,000 – $780,000 |
Add 15–25% for buildings with rooftop crane requirements or difficult mechanical penthouse access. Add 5–10% for BAS integration if your existing controls are pre-2015.
Free chiller assessment at your building.
We'll walk your mechanical room, run this 6-question framework, and deliver a written recommendation within 48 hours. Free for GTA condo boards and PMs.
Book a Chiller Audit →The financing side most PMs miss
Chiller replacement is a capital reserve draw. Two structural options that reduce the immediate reserve hit:
- Chiller-as-a-Service financing — vendors like Trane and Carrier now offer 10-year lease programs where you pay monthly instead of capital-up-front. Interest costs 6–9% but the reserve preservation can be worth it if your fund is tight.
- Save-on-Energy incentives — Ontario's Independent Electricity System Operator (IESO) runs incentive programs (currently the Retrofit Program) that pay up to $0.15/kWh saved for chiller replacements. For a 400-ton upgrade saving 60,000 kWh/year, that's a $9,000 rebate.
Frequently Asked Questions
How long does a commercial chiller last?
Air-cooled screw chillers: 15–20 years. Water-cooled centrifugal: 25–30 years with proper water treatment. Actual life depends on runtime hours and refrigerant leak history.
When should a chiller be replaced instead of repaired?
Replace when: over 80% of rated life, repair exceeds 40% of replacement, refrigerant is phased out, second compressor failure, efficiency is 20%+ above spec, or major structural corrosion.
What refrigerants have been phased out for commercial chillers?
R-11 (fully phased out 1996), R-22 (production ended 2020), R-123 (new production phased out 2020). Current standards: R-134a, R-1234ze, and R-514A.
How much can new chillers save on energy costs?
2026-spec chillers operate at 0.55–0.62 kW/ton vs 0.75–0.90 for early-2000s equipment — 20–30% improvement. On a 400-ton chiller at 2,000 hours/year, that's $18k–$32k annual electricity savings.