How much does AC compressor replacement cost in Draper?

Out-of-warranty compressor replacement on a standard residential scroll compressor in our service area runs $2,800–$4,500 installed, depending on compressor model, refrigerant type, and whether system decontamination for burnout acid is required. In-warranty compressor replacement (most major manufacturers offer a 10-year compressor warranty on registered equipment) runs $600–$1,200 in labor plus any decontamination costs, with the compressor part covered under the manufacturer warranty. We verify warranty status before quoting.

Is it worth replacing a compressor on a 10-year-old system?

Sometimes, depending on the rest of the system's condition. A 10-year-old system that has been properly maintained, uses R-410A, has a clean coil, a recent capacitor replacement, and a sound air handler may have another 6–8 years of service life after a compressor replacement. A 10-year-old system that has been skipping maintenance, has an aging filter drier, a TXV showing symptoms of refrigerant contamination, and a condenser coil with previous pinhole leak history is a different picture — the compressor replacement extends the system, but the next failure is likely in another major component within 3–4 years. We assess all of these at the diagnostic visit and give you an honest system condition picture before you decide.

My contractor says my compressor failed because it was 'run with low refrigerant' — is that my fault?

No, and the real question is why the refrigerant charge was low. Refrigerant does not disappear from a sealed system without a leak. If the system was run in an undercharged state for an extended period, the contributing causes are: the original installer didn't verify charge at installation by superheat and subcooling; the annual maintenance visits (if any) didn't verify charge by measurement; or a developing leak was not detected and repaired. None of those are homeowner errors. A compressor warranty claim being denied on the basis of 'run with low refrigerant' needs to include the service history documentation showing either that the refrigerant charge was verified at installation and at each maintenance visit, or that the system had no documented maintenance.

Can a failing compressor damage other parts of my AC system?

Yes — specifically, a compressor burnout produces carbon and acid byproducts in the refrigerant oil that circulate through the entire refrigerant circuit. The acid attacks the TXV's diaphragm and needle, the filter drier's desiccant, and the winding insulation of the replacement compressor if the system is not properly decontaminated before the replacement is installed. A compressor replacement on a burned-out system that does not include filter drier replacement, nitrogen flush, and acid test confirmation will typically result in a second compressor failure within one to three years.

How do I know if my compressor failure is covered under warranty?

The coverage depends on three things: whether the equipment was registered within the manufacturer's required window (60–90 days from installation for most brands), whether annual maintenance has been performed and documented, and whether the failure mode falls within the warranty's covered defects. Contact us with your equipment model and serial number and your approximate installation date, and we will check registration status through our distributor network and advise on warranty claim viability before you spend money on a diagnostic call. For warranted equipment, the diagnostic documentation we produce is what the warranty claim processor needs to approve the parts replacement.

AC Compressor Repair in Draper, Utah

Compressor failure is the most expensive repair in residential air conditioning — and the most frequently misdiagnosed. A compressor that trips on its internal overload protector is not necessarily a failed compressor. A compressor that draws above-rated amperage may have a failing capacitor, a refrigerant contamination problem, or a high-head-pressure condition from a fouled condenser coil. A compressor that shows correct winding resistance but will not start may have a failed start capacitor or a contactor issue. We verify compressor failure with multiple measurement steps before quoting a replacement, because quoting replacement before verification is the single most consequential diagnostic mistake in residential AC service.

What the Compressor Does

The compressor is the pressure pump of the refrigerant circuit. In a cooling system, the compressor takes low-pressure refrigerant vapor from the suction line (the large-diameter insulated line exiting the evaporator coil) and compresses it to high pressure before delivering it to the condenser coil as a high-temperature, high-pressure vapor. The energy added by the compressor to the refrigerant at high pressure is the mechanism by which heat is moved from inside the conditioned space to outside the building.

Residential central AC compressors are typically hermetically sealed scroll compressors (in modern equipment) or reciprocating piston compressors (in older equipment). In both types, the compression mechanism, motor windings, and lubricating oil are all sealed inside the compressor housing — “hermetically sealed” means there are no shaft seals to leak and no external access for inspection without refrigerant recovery and housing disassembly. This design is reliable but means that most compressor failures present as symptoms at the system level (won’t start, inadequate cooling, tripping breaker) rather than as visible component failures.

How We Diagnose Compressor Failure

We do not quote compressor replacement based on symptom alone. The diagnostic sequence for a suspected compressor failure:

Step 1 — Eliminate Upstream Causes

Before testing the compressor directly, we eliminate the components that can produce compressor symptoms without being the compressor:

Capacitor: A failed dual-run capacitor prevents the compressor from starting and produces a hum with no motor rotation that is indistinguishable from a seized compressor without a capacitor meter. We measure the capacitor first, every time. On calls where a previous contractor has already replaced the capacitor without result, we verify the replacement was spec-correct before proceeding.
Contactor: A contactor with welded-open contacts prevents the compressor start circuit from completing. We verify contactor pull-in and measure voltage across the compressor terminals under load.
Refrigerant system: A system with severely low refrigerant charge will trip the compressor on low pressure cutout, which looks like a starting problem. A system with an overcharge or a blocked filter drier will trip on high pressure cutout. We note the high- and low-side pressures at the time of the failure to determine whether pressure-related cutouts are involved.
Condenser coil fouling: A severely fouled condenser coil raises head pressure to the point where the compressor trips on high pressure or high discharge temperature. The compressor is functionally sound but is working against a heat-rejection restriction. Cleaning the coil may resolve the symptom without any compressor work.

Step 2 — Compressor Winding Resistance Testing

With the system de-energized and the capacitor discharged, we measure winding resistance at all three compressor terminals (Common, Run, Start on a single-phase compressor) using a digital ohmmeter.

For a functioning single-phase compressor:

C to R (Common to Run): lowest resistance reading, typically 1–5 Ω depending on compressor size
C to S (Common to Start): higher resistance reading, typically 2–8 Ω
R to S (Run to Start): should equal the sum of the C-to-R and C-to-S readings (Kirchhoff’s Law)

Failure modes identifiable by resistance testing:

Open winding: Infinite resistance between two terminals. The winding conductor has burned through, typically from sustained overheating. A compressor with an open winding is failed and requires replacement.
Shorted winding: Near-zero resistance between a terminal and ground (measured from a terminal to the compressor housing, which is grounded through the refrigerant line set). A shorted winding means the insulation on the winding conductor has failed and the conductor is contacting the compressor housing. This is a failed compressor. It is also an acid-generating event — compressor burnout produces refrigerant system acids that contaminate the entire refrigerant circuit and typically require a filter drier replacement, refrigerant flush, or full system decontamination before a replacement compressor will survive.
Balanced readings within manufacturer spec: The compressor windings are intact. Proceed to Step 3.

Step 3 — Locked Rotor Amperage (LRA) Test

If winding resistance is within spec but the compressor will not start or trips shortly after starting, we perform an LRA (locked rotor amperage) test. With the capacitor connected and confirmed at spec, we attempt a compressor start and measure the startup current draw with a clamp meter. A functioning compressor will draw LRA briefly at startup (typically 3–6x the RLA on a single-phase scroll compressor) and drop to RLA within 1–2 seconds as the compressor reaches operating speed.

A mechanically seized compressor draws LRA and does not drop to RLA — the motor is trying to turn a mechanically locked compression mechanism. In this case, the current eventually trips the internal overload protector. This is a confirmed mechanical failure requiring compressor replacement.

A compressor that starts and drops to RLA but draws 15–25% above RLA during steady operation has an internal mechanical problem (worn scroll tips, refrigerant contamination in the oil, slugging) that is not yet a seized failure but suggests replacement is approaching. We document this finding in the service report and give the homeowner the information needed to make an informed repair-versus-replace decision.

Step 4 — Acid Test (When Burnout is Suspected)

When winding resistance testing shows a shorted winding (compressor burnout), we perform an oil acid test using an oil acid test kit. Compressor burnout produces organic acids in the refrigerant oil that contaminate the entire system — lines, drier, expansion valve, and evaporator coil. If acid level is above the acceptable range on the test kit, a replacement compressor installed without system decontamination will typically fail within one to two seasons from acid attack on its winding insulation. Decontamination requires: flushing the refrigerant circuit with nitrogen to remove acid-laden oil residue, replacing the filter drier with a drier specified for high-acid applications, installing a new liquid-line drier at the outdoor unit, and running the replacement compressor for a brief break-in period before replacing the drier a final time. We include these steps in the compressor replacement quote when acid contamination is confirmed.

Compressor Repair vs. Replacement

For most residential single-phase scroll compressors, “repair” is not technically feasible — the hermetic sealing means no internal access without destructive disassembly. “Compressor repair” in residential HVAC means replacing the compressor assembly. The relevant decision is therefore replacement versus full system replacement, and it is driven by four factors:

System Age and Refrigerant Type

A compressor replacement on a system using R-22 refrigerant requires either sourcing an R-22-compatible replacement compressor (increasingly difficult and expensive as R-22 production has ceased) or converting the system to an R-22 retrofit refrigerant blend (R-407C or similar). Neither option is economical beyond a certain system age. For R-22 systems over 15 years old with a failed compressor, full system replacement with R-454B equipment is almost always the more economical long-term choice. For R-410A systems, compressor replacement is more straightforward. For R-454B systems (post-January 2025 equipment), compressor replacement options are still developing in the distributor supply chain as R-454B equipment service demand grows.

Warranty Status

Most major manufacturers (Carrier, Trane, Lennox, Rheem, Goodman) offer a 10-year compressor warranty on registered equipment. A compressor failure on a 4-year-old registered system is a warranty claim, not an out-of-pocket replacement. The warranty claim process requires documentation of annual maintenance (records from a licensed contractor), a written diagnostic report confirming the failure mode, and the AHRI certification number of the replacement compressor. We file warranty claims on behalf of our customers and have a working relationship with the warranty claim departments at major manufacturers’ regional distributor networks serving Salt Lake.

A warranty claim denied because maintenance records are unavailable is not necessarily a manufacturer refusal — it is frequently a documentation gap that can be addressed with the technician’s service history records. If you have had maintenance performed by other contractors, we will work with you to assemble whatever documentation exists before concluding that the claim cannot be supported.

Prior Diagnostic History

A compressor that failed due to a systematic installation defect — a refrigerant leak that was not repaired and allowed the system to run chronically undercharged, a system charged to incorrect superheat/subcooling at installation, an altitude derate skipped on a SunCrest or Traverse Ridge install that caused chronic high discharge temperature — will not be resolved by replacing the compressor alone. The defect that caused the failure must be identified and corrected, or the replacement compressor will fail from the same cause within a similar timeframe. This is why the diagnostic section above matters even on a confirmed compressor failure.

Repair-vs-Replace Economics

For a system 8–12 years old with an out-of-warranty compressor failure, we run the repair-versus-replace analysis during the diagnostic visit:

Compressor replacement cost: $1,400–$2,800 installed for in-warranty parts plus labor; $2,800–$4,500 for out-of-warranty replacement on a standard residential scroll compressor. Add $400–$800 for system decontamination if burnout acid contamination is present.
Remaining system value: A 10-year-old single-stage R-410A condenser with a new compressor and a functional air handler has 5–8 years of remaining service life under normal maintenance — or 2–5 years if it has other degraded components (aging capacitors, a failing contactor, a coil with known refrigerant leak history).
Full replacement cost: A new R-454B system installed ranges from $6,500–$12,000 depending on efficiency tier, tonnage, and whether the air handler is replaced at the same time. Rebates from the Inflation Reduction Act 25C credit ($600 for qualifying ENERGY STAR central AC) and Rocky Mountain Power Wattsmart reduce the net out-of-pocket cost.

We present both numbers and let you decide. We do not push toward replacement to capture a larger ticket, and we do not push toward repair to avoid the larger job. The right answer depends on your situation and your plans for the home.

Compressor Failure Patterns in the South Salt Lake Valley

Early Compressor Failure (Years 3–7) from Refrigerant-Related Causes

In our service area, the most common cause of early compressor failure is chronic refrigerant undercharge from an undetected leak. The refrigerant circuit’s lubricating oil circulates with the refrigerant — a system that has been running at 70% refrigerant charge for two seasons has been running with proportionally reduced lubrication at the compressor bearings and scroll tips. Scroll compressors operating in chronic undercharge conditions experience accelerated wear on the orbiting scroll’s tip seals. By the time the system stops cooling adequately and a technician is called, the compressor may have accumulated 2,000 hours of operation in an under-lubricated state. A charge top-off at this point delays the failure but does not reverse the accumulated wear.

Compressor Failure from Altitude-Related Installation Errors

At SunCrest and Traverse Ridge elevations, condensers that were not altitude-corrected at installation run at higher-than-designed discharge temperatures. The compressor’s internal discharge temperature protection trips when discharge temperature exceeds the manufacturer’s limit (typically 225–240°F for scroll compressors). A compressor that has been tripping on high discharge temperature intermittently for several seasons has been operating with its high-temperature protection as an operating mode rather than an emergency protection — each high-temperature event stresses the winding insulation and the scroll-tip lubrication film. We have seen compressor winding failures in SunCrest at year 6–8 on systems that were never altitude-corrected, while the same equipment on valley-floor installations in Sandy and Riverton runs 12–15 years without compressor failure.

Lightning-Related Compressor Failure

The July–August afternoon thunderstorm pattern in Draper and the south Salt Lake Valley produces direct and nearby lightning strikes that generate voltage transients on power lines. A transient that reaches the compressor terminals can puncture the winding insulation without producing an immediately visible failure — the insulation damage creates a partial short that passes a resistance test initially but fails under sustained operating temperature and voltage stress within weeks to months of the strike. If a compressor fails in late August or September following a summer with documented nearby lightning activity, we look for insulation damage as the primary failure mechanism rather than mechanical or refrigerant-related causes.

Frequently Asked Questions

How much does AC compressor replacement cost in Draper?: Out-of-warranty compressor replacement on a standard residential scroll compressor in our service area runs $2,800–$4,500 installed, depending on compressor model, refrigerant type (R-410A systems have more replacement compressor options currently than R-454B systems), and whether system decontamination for burnout acid is required. In-warranty compressor replacement (most major manufacturers offer a 10-year compressor warranty on registered equipment) runs $600–$1,200 in labor plus any decontamination costs, with the compressor part covered under the manufacturer warranty. We verify warranty status before quoting.
Is it worth replacing a compressor on a 10-year-old system?: Sometimes, depending on the rest of the system’s condition. A 10-year-old system in Draper that has been properly maintained, uses R-410A, has a clean coil, a recent capacitor replacement, and a sound air handler may have another 6–8 years of service life after a compressor replacement. A 10-year-old system that has been skipping maintenance, has an aging filter drier, a TXV showing symptoms of refrigerant contamination, and a condenser coil with previous pinhole leak history is a different picture — the compressor replacement extends the system, but the next failure is likely in another major component within 3–4 years. We assess all of these at the diagnostic visit and give you an honest system condition picture before you decide.
My contractor says my compressor failed because it was “run with low refrigerant” — is that my fault?: No, and the real question is why the refrigerant charge was low. Refrigerant does not disappear from a sealed system without a leak. If the system was run in an undercharged state for an extended period, the contributing causes are: the original installer didn’t verify charge at installation by superheat and subcooling; the annual maintenance visits (if any) didn’t verify charge by measurement; or a developing leak was not detected and repaired. None of those are homeowner errors. A compressor warranty claim that is being denied on the basis of “run with low refrigerant” needs to include the service history documentation showing either that the refrigerant charge was verified at installation and at each maintenance visit, or that the system had no documented maintenance (which shifts some responsibility back to the installation or maintenance contractor).
Can a failing compressor damage other parts of my AC system?: Yes — specifically, a compressor burnout (internal winding failure from overheating or insulation breakdown) produces carbon and acid byproducts in the refrigerant oil that circulate through the entire refrigerant circuit. The acid attacks the TXV’s diaphragm and needle, the filter drier’s desiccant, and the winding insulation of the replacement compressor if the system is not properly decontaminated before the replacement is installed. A compressor replacement on a burned-out system that does not include filter drier replacement, nitrogen flush, and acid test confirmation will typically result in a second compressor failure within one to three years. We include these steps in our burnout replacement quotes and explain them clearly so the customer understands what they are paying for.
How do I know if my compressor failure is covered under warranty?: The coverage depends on three things: whether the equipment was registered within the manufacturer’s required window (60–90 days from installation for most brands), whether annual maintenance has been performed and documented, and whether the failure mode falls within the warranty’s covered defects (manufacturing defect vs installation defect vs maintenance neglect). Contact us with your equipment model and serial number (on the nameplate sticker of the outdoor unit) and your approximate installation date, and we will check registration status through our distributor network and advise on warranty claim viability before you spend money on a diagnostic call. For warranted equipment, the diagnostic documentation we produce is what the warranty claim processor needs to approve the parts replacement.

Contact Draper Heating & Air Conditioning

For suspected compressor failure in Draper, Sandy, Bluffdale, Riverton, South Jordan, or Herriman — call us before authorizing a replacement quote you haven’t had independently diagnosed. Our $89 diagnostic is the cost of knowing whether the compressor is actually failed before committing to a $3,000–$4,500 replacement.

Emergency Line (24/7): (385) 336-1837
Address: 12244 Business Park Dr #155, Draper, UT 84020
Email: info@draperheatingairconditioning.xyz
Utah DOPL HVAC Contractor License: #11487612-5501
EPA Section 608 Universal: #608U-2011-318472

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AC Compressor Repair Draper | Draper Heating & Air