An outside unit that hums while the fan stays still is the call we get most in July in Portsmouth, NH, 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.
Portsmouth HVAC repairs air conditioners diagnosis-first. Our experienced technicians test rather than guess: 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.
We service central air systems, heat pumps in cooling mode, and ductless mini splits from all major brands, and our trucks stock the summer failure parts: capacitors, contactors, fan motors, hard-start kits, and condensate pumps, so most repairs are finished the same visit. When a compressor has truly failed on an aging system, we say so plainly and lay out the repair-versus-replace math honestly. For fast AC repair anywhere in Portsmouth, call (857) 767-3372 and an experienced technician will be on the way.
For winter breakdowns, see Furnace Repair in Portsmouth.
How Much Does AC Repair Cost in Portsmouth?
For most Portsmouth homeowners, an AC repair comes in somewhere between $150 and $650. The part that failed drives the price: a capacitor is a quick, inexpensive fix, while a coil or compressor is a major repair. Every repair starts with a diagnosis and a clear, upfront price.
| Repair | Typical cost | What it usually means |
|---|---|---|
| Capacitor replacementThe most common AC failure; outdoor unit hums but won't start | $150–$400 | Most common repair, usually same visit |
| Contactor replacementWorn relay that stops the condenser from starting | $150–$350 | Worn relay that stops the condenser from starting |
| 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 | Corroded or leaking indoor coil |
| Compressor replacementOn systems past 10–12 years, replacement usually makes more sense | $1,500–$3,000 | On systems past 10–12 years, replacement usually makes more sense |
Typical ranges for common repairs. Your exact price is quoted after diagnosis.
What Affects the Price
- The age of the system and whether parts are still readily available
- The type of refrigerant, since older R-22 systems cost far more to recharge
- Whether the repair is urgent, after hours, or can be scheduled
- Access to the equipment, like rooftop units or tight attic air handlers
When a quote climbs toward the cost of replacement on an older unit, we'll lay out repair and replacement prices together, with no pressure either way. Call (857) 767-3372 to get your price.
Warning Signs for AC Repair
Spotting the early warning signs gives you the chance to act before the situation spirals into something far more expensive. Watch for these telltale signs that professional help is needed:
- A burning smell or repeated breaker trips when the AC starts
- The outdoor unit humming or clicking but the fan not spinning
- Hissing or bubbling sounds that suggest a refrigerant leak
- An AC that turns on and off every few minutes but never cools down the house
- Water leaking around the indoor unit or from the ceiling below it
- An iced-over evaporator coil or frozen refrigerant lines
- Cooling bills climbing while the house stays sticky and warm
- Warm or room-temperature air blowing when the thermostat calls for cooling
Don't Wait for a Total Failure
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. Call Portsmouth HVAC at (857) 767-3372 at the first sign of trouble.
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The Benefits of Professional AC Repair
An air conditioner puts 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.
What to Expect From Our AC Repair
Our systematic workflow delivers thorough, lasting results on every job. Here's how we handle AC repair from start to finish:
Full Cooling Diagnosis
Before any part comes out, 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.
Clear Explanation & Price
Nothing happens without your approval. We explain what broke and why, quote a firm price, and, if the compressor or coil has failed, walk you through the repair-or-replace decision honestly.
On-the-Spot Fix
Since the common summer failures, like capacitors, contactors, and fan motors, are stocked on the truck, most AC repairs are wrapped up during the first visit.
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.
Not Sure What You Need?
We provide honest advice and upfront pricing on all AC repair work.
Call (857) 767-3372 NowMaintenance Tips for AC Repair
Taking preventive measures can help you avoid costly heating and cooling problems down the road. Start with these practical measures our team relies on:
- Leave vents open in every room, since closing them strains the blower
- Schedule a spring tune-up so weak parts are caught before summer arrives
- Listen for new buzzing or clicking at startup, the classic sound of a dying capacitor
- Shade helps, but never enclose the outdoor unit; it needs free airflow on all sides
- Start each cooling season by flushing the condensate line so algae cannot block it
- Swap filters monthly while the AC is running hard to keep the evaporator coil from icing
- Hose off the condenser coil every spring and trim plants to at least two feet away
Should You DIY or Call a Pro?
While some minor tasks like changing filters or checking a thermostat can be handled by homeowners, most HVAC work involves refrigerant, gas combustion, and high-voltage electricity, jobs that call for professional expertise. Here's a comparison:
| Factor | DIY Attempt | Professional Service |
|---|---|---|
| Refrigerant | Recharge cans that ignore the leak | Leak located, repaired, charge weighed in |
| Shock Risk | Live 240V wiring and a charged capacitor | Capacitors drained, power confirmed off |
| Frozen Coils | Same ice, again and again | Airflow or charge problem identified and fixed |
| Diagnosis | Picking a likely part and hoping | Meters, gauges, and temperature clamps |
| Parts | Close-enough capacitors and motors | Ratings matched to the data plate |
| Result | Cold air until the next heat wave | Repair verified under real load |
Get AC Repair Help Today
The sooner you call, the sooner your comfort is back. Reach Portsmouth HVAC for fast service.
Get Help: (857) 767-3372AC Repair Near Portsmouth
We serve Portsmouth and its neighboring communities for AC repair, from quick same-day repairs to planned installs.