Repair or replace? The 50% rule, remaining-life math, and energy-cost truth per appliance
| Appliance | Lifespan | New cost | Energy $/yr |
|---|
The repair-or-replace call arrives with a puddle and a $350 quote, and the industry's honest heuristic — repair if the quote is under 50% of replacement cost, adjusted for remaining life — is computable in ten seconds if you know the lifespans. This calculator carries the real numbers for twelve appliances, runs the adjusted rule on your quote, and flags the energy exception where replacing a working machine pays.
| Appliance | Expected life | Failure mode worth knowing |
|---|---|---|
| Dishwasher | ~10 yrs | Pumps and control boards — repairs cluster near replacement cost |
| Washer / dryer | 11 / 13 | Bearings (washer) are the death sentence; heating elements (dryer) are cheap fixes |
| Refrigerator | ~13 | Compressors kill; door seals and fans are $50 DIY saves |
| Water heater (tank) | 10–12 | Fails by flooding — replace proactively at 10+; never nurse one |
| Furnace / central AC | 18 / 15 | The 5k-repair-vs-replace calls where the rule earns its keep — and where heat-pump rebates change the answer |
The classic rule (repair under 50% of new) over-repairs old machines: a $350 fix on a 9-year washer buys ~2 remaining years, while the same $350 on a 4-year unit buys 7. The adjustment: scale the threshold by remaining life — which is what the verdict card computes. Overlay the judgment factors: a second repair within a year of the first means the machine is telling you something; matching-set aesthetics are worth exactly what you decide they are; and repair-friendliness varies by brand (parts availability is why the 20-year-old Speed Queen exists).
Some working appliances deserve retirement: pre-2001 refrigerators burn $150–250/yr more than modern ones (the garage beer fridge is the classic $200/yr luxury — see the Utility tool), old water heaters and HVAC similarly. When a replacement saves $100+/yr in energy AND rebates apply (Energy Upgrades tool), the payback math can beat even a free repair.
Same math as cars (see the Extended Warranty tool): mostly no — margins are huge and the credit card you bought with often doubles the manufacturer warranty free. Self-insure via the repair fund; exception territory is $3k+ built-in units with known board issues.
Partly true: electronics-laden modern units have more failure points than 1990s electromechanical ones, and efficiency standards drove complexity. Counterpoint: they use half the energy and water. The longevity outliers (commercial-style, simple controls) exist for buyers who prioritize it.
Door seals, dryer heating elements, washer inlet valves, disposal resets/replacements, fridge fans, dishwasher spray arms — YouTube plus a $30 part solves a huge share of 'service calls.' Sealed-system (compressor, refrigerant) and gas work: professionals, period.
Holiday sale cycles (appliances discount 25-40% around Memorial/Labor Day and Black Friday), floor models and dent-and-scratch (10-25% more off), and BEFORE failure for anything that fails wet (water heaters, washers upstairs). The emergency purchase is the full-price purchase.
The appliance itself: no (wear isn't a peril). The water damage it causes: usually yes, minus your deductible — which is why the $12 water-heater drip pan and auto-shutoff valves are the highest-ROI hardware in this whole topic.
Survey data clusters: simple top-load washers and basic fridges outlast feature-rich versions across brands; Speed Queen (laundry) and commercial-style units earn their premiums in years; the smart-everything tier adds failure modes faster than value. Buy boring for longevity.
Yes — every figure computes locally in your browser.
Know the lifespan, run the adjusted rule against the quote, and retire the flooding-class machines on your schedule instead of theirs. The appliance that fails politely is the one you replaced a month early.