How the calculator decides
It adds up the same signals a technician weighs: age against typical service life, how serious and how frequent the repairs are, whether the system uses phased-out R-22 refrigerant, and comfort or bill problems. A low score points to repair, a middle score to pricing both options, and a high score to replacement.
| Factor | Pushes toward replacing when… | Why it matters |
|---|---|---|
| Age | An AC or heat pump is 10+ years old, or a furnace is 15+ | ENERGY STAR suggests considering replacement past those ages, when newer, more efficient equipment can cut energy use. |
| Type of repair | The compressor, a coil, or a furnace heat exchanger has failed | These are the most expensive parts. On an older system, the repair can approach the cost of new equipment. |
| Repair history | Two or more repairs in two years | Repeat failures usually mean more are coming. |
| Refrigerant | The system uses R-22 | R-22 production ended in the U.S. in 2020, so recharging it relies on limited, costly reclaimed supply. |
| Comfort and bills | Rooms won't stay even, or bills keep climbing | Replacing can also fix sizing and airflow problems a repair won't touch. |
| The $5,000 rule | Age × repair quote is over 5,000 | A quick sanity check. It's a rule of thumb, not a standard, so it's one factor among several. |
What the result doesn't know
A calculator can't see your equipment. It doesn't know whether a "compressor problem" is really a $200 part, whether your ducts are leaking, or whether a smaller or larger system would serve your home better. North County's mix of coastal salt air and inland heat also changes how fast outdoor units wear. Treat the result as a way to decide which questions to ask, not as the answer. For the full reasoning, read our guide on whether to repair or replace an AC.
If the result points to replacement, we'll come out and walk you through options with a free in-home estimate, and if it points to repair, we'll diagnose the problem first. Either way you'll get a real person from Fallbrook: (760) 728-8716.
Frequently asked questions
How does the repair-or-replace calculator decide?
It weighs your system's age against typical service lives, how serious the repair is, how often it has broken down lately, whether it uses phased-out R-22 refrigerant, and comfort or bill problems. Optionally it applies the $5,000 rule of thumb. It's a starting point, not a quote or a diagnosis.
Is the $5,000 rule reliable?
It's a rule of thumb, not a standard. Multiply your system's age by the repair quote; if the result is over 5,000, replacement is worth pricing out. It ignores efficiency, comfort and refrigerant, which is why the calculator treats it as one factor among several.
Does a cracked heat exchanger mean I need a new furnace?
Treat it as a safety problem first: a cracked heat exchanger can let combustion gases, including carbon monoxide, mix with your air. Shut the furnace off and have it professionally assessed. In most cases replacement is the recommendation rather than a repair.