Repair or Replace an Appliance: The AI Decision
The repair-or-replace call has an actual formula. Nobody runs it at 7 PM when the fridge dies. Here is the math, honestly.
The short answer
Use the 50 percent rule: if the repair costs more than half the price of a new appliance and the unit is past half its expected lifespan, replace it. Below that threshold, repair. Always check for an active warranty first, since a covered repair changes the math entirely.
Repair or replace: what is the 50 percent rule?
The 50 percent rule
Replace an appliance if the repair quote exceeds 50 percent of the cost of a comparable new unit AND the appliance is past 50 percent of its expected lifespan. If either test fails, repairing is usually the smarter money. This single rule settles most repair-or-replace decisions in about thirty seconds.
Here is the problem the rule solves. A repair tech is standing in your kitchen at 7 PM quoting $420 to fix a 12-year-old refrigerator. You have no idea if that fridge was supposed to last 10 years or 20, no idea what a comparable replacement costs today, and no idea whether the compressor is still under a manufacturer warranty you forgot about. So you say yes, because saying no feels riskier.
That is how people spend $420 on a fridge with two years left in it. The 50 percent rule exists to stop the panic decision, but almost nobody has the four numbers it needs sitting in their head at the moment the appliance dies.
Key takeaways
- Repair cost over 50 percent of a new unit plus age past half its lifespan means replace.
- A repair under 50 percent on a mid-life appliance is almost always worth doing.
- Check warranty coverage before you approve anything: compressors and sealed systems often carry 5 to 10 year coverage.
- Energy efficiency gains can justify replacing an appliance that is technically still repairable.
- The decision is math, not emotion, but you need four numbers to run it.
Run the repair-vs-replace math
Plug in the four numbers a tech will not run for you. The calculator gives you the repair-cost ratio and the annual cost of repairing versus replacing over the remaining life you would get. If the repair ratio is above 50 percent, lean replace.
Interactive calculator
Repair or Replace Calculator
Enter the repair quote, the price of a comparable new unit, and the appliance's age against its typical lifespan.
The uncomfortable part: a repair does not reset the clock. Fixing a 12-year-old fridge does not give you a new fridge, it gives you a 12-year-old fridge that works again for a while. The calculator bakes in a modest three-year assumption for a typical repair, which is generous for most sealed-system fixes and stingy for a simple part swap. Adjust your read accordingly.
How long appliances actually last (and typical repair costs)
You cannot run the 50 percent rule without knowing an appliance's expected lifespan. These are widely cited industry averages. In Florida, humidity and salt air shave years off the high end, especially for anything with a compressor or a coil.
| Appliance | Typical lifespan | Common repair range | Replace if repair over |
|---|---|---|---|
| Refrigerator | 10-13 yrs | $200-$500 | $650 |
| Dishwasher | 9-12 yrs | $150-$400 | $450 |
| Clothes washer | 10-13 yrs | $150-$450 | $500 |
| Clothes dryer | 10-13 yrs | $100-$400 | $450 |
| Electric range/oven | 13-15 yrs | $150-$400 | $600 |
| Microwave (built-in) | 9-10 yrs | $100-$250 | $300 |
| Water heater (tank) | 8-12 yrs | $150-$500 | $600 |
| HVAC air handler | 10-15 yrs | $300-$1,500 | $3,000 |
The rightmost column is the 50 percent rule pre-calculated against a mid-range new unit. Cross it and you are usually better off replacing, especially for a unit already past its lifespan midpoint. For a full breakdown of what wears out and when, see appliance lifespans and replacement planning and, for AC specifically, AC lifespan and maintenance in Florida.
Check the warranty first, every single time
Quick answer
Before approving any appliance repair, check for an active warranty. Refrigerator compressors and sealed systems commonly carry 5 to 10 year manufacturer coverage even after the 1-year full warranty expires. A covered part can turn a $420 quote into a $120 labor charge, which flips the repair-or-replace math instantly.
This is the number one thing owners skip. The full warranty on most appliances runs a year, so people assume anything older is out of pocket. But manufacturers routinely cover major components (compressors, sealed refrigeration systems, some motors and tubs) for 5, 7, or 10 years. The paperwork is in a drawer, a spam folder, or nowhere.
This is exactly the kind of buried, deadline-adjacent fact that AI is good at holding. When a homeowner's documents live in one place, an assistant like Danny at One Home Agent can surface the model number, purchase date, and warranty term the moment an appliance fails, before a tech ever quotes you. That is the difference between a $120 job and a $420 one.
If you never registered the appliance, you can still often verify coverage by model and serial number plus a proof of purchase. That is why keeping receipts matters more than people think. See home documents to keep forever.
Checklist
0/8Before you approve any appliance repair
When efficiency changes the answer
Sometimes a repairable appliance should still be replaced because it is quietly expensive to run. A refrigerator or water heater from the mid-2000s can use significantly more energy than a current model. That efficiency gap is a real line item, not marketing.
The rule of thumb: for high-energy appliances (refrigerators, HVAC, water heaters), factor 3 to 5 years of energy savings into the replace side of the ledger. For low-draw appliances (a dryer, a microwave), efficiency rarely moves the decision. Do not let an appliance salesperson apply the fridge logic to your toaster oven.
“The repair-or-replace call is not hard math, it is math nobody runs at the wrong hour. The tech is not going to look up your warranty term or price a new unit for you, and honestly it is not their job. The moment those four numbers are in front of a homeowner, the panic decision disappears.”
Todd Paton, Partner, One Home Agent
The bottom line
Bottom line
For your $400 repair on an old appliance: if it is past half its lifespan and the quote exceeds half a new unit's cost, replace it. If it is mid-life and the quote is well under half, repair it. And check the warranty before either, because a covered part can make the whole question moot.
Never make the 7 PM appliance decision blind again
One Home Agent keeps your appliance ages, receipts, and warranty terms in one place, so the four numbers you need are ready before a tech quotes you. It is offered as a lifetime amenity through property managers, brokerages, and title companies.
See how it worksFrequently asked questions
The 50 percent rule says to replace an appliance when the repair cost exceeds half the price of a comparable new unit and the appliance is past half its expected lifespan. If the repair is cheaper than that threshold or the appliance is still relatively young, repairing is usually the better financial choice.
Sources & further reading