AC Repair vs. Replacement: How to Decide
A dead AC in July forces a fast, expensive decision. Here’s the simple rule for repair vs. replace, plus real 2026 costs so you don’t overpay under pressure.
Updated July 10, 2026 · 7 min read
Air conditioners have a habit of failing on the hottest day of the year, when you’re least inclined to shop carefully. That pressure is exactly how people get talked into a €10,000 system they didn’t need — or keep pouring money into a unit that should be replaced.
This guide gives you a clear framework for repair vs. replacement, the 2026 costs for each, and the questions to ask before you commit.
The simple decision rule
A widely used rule of thumb: multiply the repair cost by the unit’s age in years. If that number exceeds about €5,000 replacement is usually the smarter move. A €400 repair on a 5-year-old unit (€2,000) → repair. A €700 repair on a 12-year-old unit (€8,400) → replace.
Also lean toward replacement if the system uses the old R-22 refrigerant (expensive and being phased out), fails repeatedly, or is over ~12–15 years old.
2026 repair costs
Common AC repairs and typical price ranges:
- Capacitor or contactor replacement: €150–€450.
- Refrigerant recharge (and leak fix): €300–€1,200 depending on refrigerant.
- Fan motor: €400–€900.
- Compressor replacement: €1,500–€3,000 (often the "just replace it" moment on an older unit).
2026 replacement costs
A new system is priced by size (tons) and efficiency (SEER2 rating):
- Central AC unit only: €4,500–€8,000 installed.
- AC + boiler (full system): €8,000–€14,000 installed.
- Heat pump (heating + cooling): €6,000–€16,000 installed, often incentive-eligible.
- High-efficiency units cost more upfront but cut summer bills and may qualify for rebates.
Before you sign
Get a couple of quotes even in an emergency, and make sure the installer does a proper load calculation (Manual J) rather than just matching your old unit’s size — an oversized system short-cycles, wastes energy, and wears out faster. Confirm the quote includes a new thermostat, proper refrigerant line handling, permits, and a labour warranty separate from the manufacturer’s parts warranty.
Heating & cooling costs in Ireland
Figures are in euro, and Irish homes are heated with boilers and radiators rather than ducted forced air. Oil-fired and gas central heating are both common, and air-source heat pumps are growing quickly with SEAI grant support and a strong retrofit push. Home air conditioning is rare.
Gas work must be done by an RGII installer, and heat-pump installs should follow the relevant standards to qualify for grants. Right-sizing to the home and its insulation level is essential — the national retrofit programme often pairs a heat pump with upgraded insulation.
HVAC System Replacement cost by city
See location-adjusted hvac system replacement costs for your area:
Frequently asked questions
How long should an AC last?
Most central air conditioners last 12–17 years with maintenance. Past that, efficiency drops and parts get harder to find, so replacement often makes sense even if it still runs.
Is a heat pump worth it over a regular AC?
In many climates, yes — a heat pump both cools and heats efficiently, can replace a separate boiler, and frequently qualifies for 2026 rebates and tax credits. Ask an installer to compare lifetime costs for your home.
Why is my AC freezing up?
Usually low refrigerant (a leak) or restricted airflow from a dirty filter or coil. Turn it off to thaw and call a tech — running a frozen unit can damage the compressor.
Can I replace just the outdoor unit?
It’s possible but often unwise — mismatching a new outdoor condenser with an old indoor coil hurts efficiency and can void warranties. A tech should confirm compatibility.
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