An outside unit that hums while the fan stays still is the classic summer service call in Ann Arbor, MI, and the cause is usually a failed run capacitor. That inexpensive component starts the compressor and fan, fades for years without complaint, and then quits under peak load. It is far from the only suspect, though. Contactors pit and stop passing clean power, condenser fan bearings dry out, small refrigerant leaks drain away cooling capacity, and evaporator coils ice over when a clogged filter strangles airflow.
Ann Arbor HVAC repairs air conditioners diagnosis-first. Our experienced technicians measure before they replace: capacitors metered for microfarads against the label rating, compressor and fan amp draws checked against the data plate, refrigerant charge evaluated by superheat and subcooling rather than a quick glance at the gauges, and the evaporator coil, blower wheel, and filter inspected whenever icing is in the picture. That matters because the same warm-air complaint can be four different faults at four very different costs, and topping off refrigerant without finding the leak just rents you cold air until it escapes again.
Honest advice is part of every visit. If an aging system's compressor has failed, we explain the repair-versus-replacement math plainly and let you decide. Most of the time, though, the fix is simpler, and because our trucks stock capacitors, contactors, fan motors, hard-start kits, and condensate pumps, the house is usually cooling again before we leave. We work on central air, heat pumps, and ductless mini splits from all major brands. Need AC repair in Ann Arbor? Call (734) 215-6957 and an experienced technician will be on the way.
Heating trouble instead? See Furnace Repair in Ann Arbor.
How Much Does AC Repair Cost in Ann Arbor?
Most air conditioner repairs in Ann Arbor land between $150 and $650. Where you fall in that range depends almost entirely on which component failed. You'll get an upfront quote from Ann Arbor HVAC before we touch a single part.
| Repair | Typical cost | What it usually means |
|---|---|---|
| Capacitor replacementThe most common AC failure; outdoor unit hums but won't start | $150–$400 | The most common AC failure; outdoor unit hums but won't start |
| Contactor replacementWorn relay that stops the condenser from starting | $150–$350 | Burned or pitted switch that powers the outdoor unit |
| Condenser fan motorOutdoor fan stops, compressor trips on high heat | $300–$700 | Fan won't spin, unit overheats and shuts down |
| Refrigerant leak repair + rechargeDepends on leak location and refrigerant type | $300–$1,500 | Varies with where the leak is and how much charge is lost |
| Evaporator coil replacementMajor repair; worth weighing against replacement on older systems | $1,000–$2,500 | Major repair; worth weighing against replacement on older systems |
| Compressor replacementLargest single repair; often weighed against a new system | $1,500–$3,000 | Largest single repair; often weighed against a new system |
These are common price ranges, not quotes. We confirm the exact price after diagnosing your system.
Factors That Change the Price
- How old the unit is and how easy its parts are to source
- Refrigerant type, because R-22 recharges are much more expensive
- Timing, such as same-day or after-hours service versus a scheduled visit
- How hard the equipment is to reach, such as attics, crawlspaces, or rooftops
On older systems we always compare the repair against a replacement, so you can make the call with real numbers. Call (734) 215-6957 to get your price.
Signs You Need AC Repair in Ann Arbor
Spotting the early warning signs gives you the chance to act before the situation spirals into something far more expensive. Here are the most common indicators that it's time to call a professional:
- Higher summer bills even though the house still feels warm and humid
- Bubbling or hissing noises that point to a possible refrigerant leak
- Vents blowing air that is barely cooler than the room
- The outdoor unit humming or clicking but the fan not spinning
- Breaker trips or a burning odor at startup
- Puddles near the air handler or water stains on the ceiling beneath it
- Frost or ice forming on the copper lines or the indoor coil
- Rapid on-off cycling that never brings the temperature down
Act Before It Gets Worse
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. Don't wait, get Ann Arbor HVAC on the phone at (734) 215-6957 and we'll take a look right away.
Frequently Asked Questions About AC Repair
The Benefits of Professional AC Repair
An air conditioner packs several hazards into one cabinet. The capacitor can deliver a painful shock long after the breaker is off, the condensing unit is wired for 240 volts, and the refrigerant circuit is a sealed, pressurized loop that federal rules forbid venting. Servicing it properly takes gauges, a recovery machine, and a vacuum pump, not a DIY recharge can. Diagnosis has its own traps. A frozen coil is as likely to be an airflow issue as a charge issue, and recharging a system that still leaks throws money away while moisture and acid work on the compressor.
What you get from a pro is a repair that holds. Our experienced technicians find leaks with dye and electronic detectors, base every charge decision on superheat and subcooling, test electrical parts with a meter before condemning them, and measure static pressure and inspect the blower and filter any time airflow is in question. Parts-cannon fixes tend to bring you back in a few weeks. Ours are built to last through the heat. And if the numbers say replacement is the better call, we show you those numbers honestly, without pressure.
How Our AC Repair Works
Our systematic workflow delivers thorough, lasting results on every job. Here's how we handle AC repair from start to finish:
Testing First
Before we replace anything, we meter the electrical components, read the refrigerant charge with superheat and subcooling, and look over the coil, filter, and condensate line for the actual cause.
Findings & Firm Quote
We show you what failed and why, then give a firm price before any work begins. If the compressor or coil points toward replacement instead, we lay out the honest math.
On-the-Spot Fix
Most AC fixes happen right away. We carry capacitors, contactors, fan motors, and other high-failure parts, so you are rarely left waiting on a parts order.
Performance Verification
We confirm a healthy temperature split across the coil, verify amp draws and charge, clear the condensate line, and watch a full cooling cycle before we leave.
How to Prevent AC Repair Problems
A little routine maintenance goes a long way toward avoiding a mid-season breakdown. Follow these tips from our experienced technicians:
- Leave vents open in every room, since closing them strains the blower
- Swap filters monthly while the AC is running hard to keep the evaporator coil from icing
- Pay attention to buzzing or clicking when the AC starts, a common warning of a failing capacitor
- Shade is fine, but do not box in the outdoor unit with fences or covers
- Rinse the outdoor condenser coil each spring and keep vegetation two feet back
- Schedule a spring tune-up so weak parts are caught before summer arrives
- Start each cooling season by flushing the condensate line so algae cannot block it
DIY vs. Professional AC Repair
Online tutorials may help in a pinch, yet lasting repairs and code-compliant installations usually depend on professional methods and trained technicians. Here's a comparison:
| Factor | DIY Attempt | Professional Service |
|---|---|---|
| Refrigerant Leaks | Adding refrigerant while it keeps leaking | Leak repaired and correct charge restored by weight |
| Electrical Safety | Stored capacitor charge and live 240V | Capacitors drained, power confirmed off |
| Iced Coils | Same ice, again and again | Cause of the icing traced and corrected |
| Diagnosis | Picking a likely part and hoping | Measured with meters, gauges, and clamps |
| Replacement Parts | Parts that are almost the right rating | Correct ratings for your exact unit |
| Result | Works until the next hot spell | Tested and confirmed under load |
Talk to a AC Repair Expert
The sooner you call, the sooner your comfort is back. Reach Ann Arbor HVAC for fast service.
Call (734) 215-6957 TodayAC Repair Near Ann Arbor
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