The $5,000 AC rule, explained
Take the age of the air conditioner in years, times the dollar amount of the repair. Land above $5,000 and it is time to get a replacement price as well. This Old House states it that way, and it is a back-of-the-envelope check, not an industry standard.
Running the numbers on three systems
| Unit's age | What failed, quoted | Age times quote | Verdict |
|---|---|---|---|
| 6 | Capacitor, $300 | $1,800 | Fix it |
| 12 | Contactor, $450 | $5,400 | Get a replacement price too |
| 14 | Compressor, $2,200 | $30,800 | Replace |
Illustrations, not anyone's quote. Each repair figure falls inside the national ranges Fixr and This Old House publish.
The weak spots
The math leans hard toward replacement once a unit gets old, even for a cheap part. The 12-year-old system in the middle row crosses $5,000 over a $450 contactor, yet a small repair on a unit that otherwise cools fine is often the sensible move, as long as you start budgeting for its successor. Use the rule as a prompt to ask for a replacement number, not as the decision itself.
It also misses things a Buffalo owner should weigh: a condenser that only works a few months of the year, a furnace downstairs that may be due at the same moment, and whether this is the first repair or the third summer running.
A Western New York version
- Do the age-times-cost math.
- If it comes out over $5,000, ask the same company for a replacement quote on the same visit.
- Set the two side by side. If a heat pump is on the table, have a NYS Clean Heat participating contractor tell you what incentive the job earns.
- Think about when. A replacement scheduled in April or October is a calmer purchase than one forced on you in a July heat wave.
What people around Buffalo want to know
How does the $5,000 AC rule work?
Multiply how old the system is by what the repair costs. Per This Old House, a result above $5,000 suggests replacing may beat repairing. It is a rough guide, nothing more.
Can I use the $5,000 rule on a heat pump?
As a first pass, yes. Keep in mind a heat pump works through winter as well as summer, so it racks up running hours faster than an AC of the same age.