DIY troubleshooter · causes ranked by how often each turns out to be the problem, in our judgment (no dataset ranks them)
Homeowners search for how to swap a capacitor, recharge refrigerant, or replace a compressor. These are the jobs on the wrong side of the line. This page lists the symptoms that point to them, what to check safely, and why we do not give repair steps.
Source: HVACPro analysis of 1,611 homeowner-reported quotes and invoices in public Reddit posts dated 2025-01-01 to 2026-09-29. Each price is the median of the reports for that job, and "most" is the middle half of them (25th to 75th percentile). Homeowners reported these prices and we did not verify them.
Simplified drawing, not to scale. Real systems vary: the indoor unit can sit in an attic or closet, the ducts can run in the attic or under the floor. Original illustration, not a photo.
Stock photo, not our work. Photo by Yusuf Çelik via Pexels.
How to checkOutdoor fan or compressor will not start, hums, or starts slowly; a bulged or leaking can is a visible sign, but seeing it means opening the panel. Note the symptom and stop.
Typical repair costCapacitor: Median $310 (most $220–$400), 26 homeowner reports
How to checkIce on the suction line, hissing, oily residue at joints, and weak cooling. A sealed system does not lose refrigerant through use; low charge means a leak that must be found and fixed.
Typical repair costRefrigerant leak repair: Median $1,320 (most $800–$3,000), 32 homeowner reports; Refrigerant recharge: Median $690 (most $460–$1,200), 48 homeowner reports
How to checkThe outdoor unit trips the breaker, hums without starting, or knocks loudly. A compressor is sealed and welded into the refrigerant circuit.
Typical repair costCompressor: Median $3,000 (most $1,900–$4,000), 43 homeowner reports
How to checkThe outdoor unit clicks but does not start, or starts and stops. The contactor is a relay switching 240 volts to the compressor and fan.
Typical repair costContactor: Too few reports to price (3)
How to checkVisible dirt or matting on the outdoor coil fins with cooling that fades on hot afternoons. The condenser coil is on the outside of the cabinet.
Typical repair costFree to check.
Ranks are editorial, not measured. A price is what homeowners reported for that one part or job, not a quote for the cause on that row, and a cause can involve more than one part. Source: HVACPro analysis of 1,611 homeowner-reported quotes and invoices in public Reddit posts dated 2025-01-01 to 2026-09-29. Each price is the median of the reports for that job, and "most" is the middle half of them (25th to 75th percentile). Homeowners reported these prices and we did not verify them.
$190
Median pro diagnostic visit, from 62 homeowner reports
Source: HVACPro analysis of 1,611 homeowner-reported quotes and invoices in public Reddit posts dated 2025-01-01 to 2026-09-29. Each price is the median of the reports for that job, and "most" is the middle half of them (25th to 75th percentile). Homeowners reported these prices and we did not verify them.
These checks need no tools beyond a screwdriver, a hose, or a vacuum. Do them in this order.
6 Outdoor unit: compressor, fan and condenser coil
The causes below are not DIY, and we give no repair steps for them. Each carries a specific danger.
Source: Stationary Refrigeration and Air Conditioning (Clean Air Act Section 608), 2026-09-30; retrieved 2026-09-30.
Source: Stationary Refrigeration and Air Conditioning (Clean Air Act Section 608), 2026-09-30; retrieved 2026-09-30.
Stock photo, not our work. Photo by Alex Domínguez via Pexels.
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Need a licensed HVAC pro in the Tampa Bay outer ring? Call and we'll connect you with a licensed local contractor.
HVACPro is a free referral service for homeowners, not an HVAC company. We don't do the work, and we may be paid by the contractor. Check any contractor's license on the state's lookup before you hire.
Every city below has an A-to-Z list of the businesses with an active Florida HVAC license there. The number on each chip is that count.
Counts: businesses with an active license and a city address in the Tampa Bay outer ring, from FL DBPR construction licensee extract (CONSTRUCTIONLICENSE_1.csv), retrieved 2026-10-05. A license says the state permits the work, not that the work is good.
A pro visit starts with a diagnostic fee. Homeowners reported: Median $190 (most $100–$290), 62 homeowner reports. The repairs behind the causes on this page:
Reported price, U.S. dollars
Source: HVACPro analysis of 1,611 homeowner-reported quotes and invoices in public Reddit posts dated 2025-01-01 to 2026-09-29. Each price is the median of the reports for that job, and "most" is the middle half of them (25th to 75th percentile). Homeowners reported these prices and we did not verify them.
| Repair | Median | Most (middle half) | Reports |
|---|---|---|---|
| Capacitor | $310 | $220–$400 | 26 |
| Refrigerant leak repair | $1,320 | $800–$3,000 | 32 |
| Refrigerant recharge | $690 | $460–$1,200 | 48 |
| Compressor | $3,000 | $1,900–$4,000 | 43 |
| Contactor | Too few reports to price | 3 | |
These are national prices. We do not have enough Tampa Bay outer ring reports to publish a local one.
See the AC repair cost guide and the AC replacement cost guide for every repair and job we have enough reports to price.
Source: HVACPro analysis of 1,611 homeowner-reported quotes and invoices in public Reddit posts dated 2025-01-01 to 2026-09-29. Each price is the median of the reports for that job, and "most" is the middle half of them (25th to 75th percentile). Homeowners reported these prices and we did not verify them.
No utility rebate applies to this repair. The programs on file pay for replacement equipment or a tune-up, not for a repair like this one.
Stock photo, not our work. Photo by ready made via Pexels.
No. EPA says Section 608 certification is required to recharge appliances, and refrigerant for stationary appliances is sold only to certified technicians or the companies that employ them. EPA also prohibits knowingly venting refrigerants, including R-410A, while servicing air conditioning equipment. If your air conditioner leaks, EPA says to ask your technician to locate and repair the leak instead of topping it off.
Checked against: U.S. EPA: Homeowners and Consumers: Frequently Asked Questions; U.S. EPA: Refrigerant Sales Restriction; U.S. EPA: Section 608 Technician Certification Requirements. Pages opened 2026-09-30.
We do not give steps for it. Carrier says AC capacitors store high-voltage electricity that can cause serious injury or death even when the power is disconnected, and that a wrong voltage or microfarad rating can damage your system.
Trane says capacitors should be tested, discharged, or replaced only by a trained HVAC professional. OSHA requires that capacitors be discharged when their stored energy might endanger personnel.
Checked against: Carrier: What is an AC Capacitor? Cost, Signs of Failure & Replacement; OSHA: 29 CFR 1910.333, Selection and use of work practices; Trane: All About Heat Pump Capacitors and Signs of Trouble. Pages opened 2026-09-30.
Carrier lists these signs of a failing compressor: no cool air, strange noises such as grinding, squealing, or banging, a tripped circuit breaker, and overheating. A failed capacitor can stop a compressor from starting, and Trane says a failed start capacitor can cause a loud humming noise. Have an HVAC professional diagnose the root cause before you assume the compressor is bad.
In our price data, homeowners reported a median of $310 for a capacitor (26 reports) and $3,000 for a compressor (43 reports). Compressor work is not a DIY job.
Checked against: Carrier: What Is an AC Compressor? Function, Cost & Repair Guide; HVACPro: HVACPro analysis of homeowner-reported repair prices; Trane: All About Heat Pump Capacitors and Signs of Trouble; Trane: What Is an HVAC Compressor and How Does It Work?. Pages opened 2026-09-30.