Leak Detection Specialists · Brooklyn, NY
AC Leak Detection Brooklyn
We Find Leaks Other Techs Miss.
Most HVAC companies top off refrigerant and call it a day. We don't. Brownstone runs nitrogen pressure tests and electronic detection to pinpoint exactly where your system is losing refrigerant — then we fix it right so it doesn't come back.
Every Leak Type. One Call.
We test and repair all four failure points where residential and multi-unit HVAC systems lose refrigerant in Brooklyn buildings.
Refrigerant Line Leaks
Refrigerant leaks from line set connections, schrader valves, or brazed joints are the most common cause of a system that cools for a while then stops. We pressurize the system with nitrogen and isolate each section to find the exact point of loss — not just top it off and hope.
Evaporator Coil Leaks
Coil corrosion is common in NYC apartments — formicary corrosion from off-gassing building materials eats through copper over time. A coil leak usually shows up as ice formation or progressive loss of cooling. We diagnose and replace coils, not just patch them.
Line Set & Copper Piping
Long runs through walls, floors, and ceilings in Brooklyn brownstones and walk-ups create multiple potential leak points. We pressure-isolate each section to identify exactly where the break is before opening anything up — saving you time and unnecessary wall damage.
Fittings, Valves & Connections
Flare fittings, service valves, and field connections vibrate loose over time. In multi-zone mini split systems — Daikin, Mitsubishi, Fujitsu — branch box connections are a frequent culprit. We check every port with manifold gauges and electronic detectors.
How We Find the Leak
A systematic process — not guesswork. Every step is documented so you know exactly what we found and where.
System Pressure Check
We recover refrigerant and pressurize the system with nitrogen to operating pressure. This immediately tells us if a leak is present and roughly how severe.
Section Isolation
We isolate the system into sections — indoor coil, line set, outdoor unit, branch boxes — and monitor pressure drop in each to pinpoint which zone is losing pressure.
Electronic Detection
Once we've narrowed the section, we use an electronic refrigerant leak detector to find the exact fitting, weld point, or coil location. No guessing.
Fix & Recharge
We repair the leak — rebraze, replace the fitting, or swap the coil — then pressure-test again to confirm it holds before recharging with refrigerant.
Why Brooklyn Homeowners Call Us First
Most HVAC companies will add refrigerant without finding the leak. That's a band-aid. You'll lose it again in weeks or months, pay again, and still have the same problem. We find it once and fix it for good.
- 95% success rate locating the exact leak source
- Nitrogen pressure testing on every leak diagnosis
- Electronic detection — not just soap bubbles
- All brands: Daikin, Mitsubishi, Fujitsu, Carrier, Bryant, York
- Multi-zone mini split systems and central air
- Upfront flat-rate pricing before any work starts
- 0% financing available on qualifying repairs
- Fully licensed & insured · Brooklyn-based
Losing Refrigerant? Let's Find It.
Same-day leak diagnosis when available. Upfront pricing. No band-aids.
Common Questions
How do I know if my AC has a refrigerant leak?
The most common signs are: system cools for a while then stops, ice forming on the indoor unit or line set, hissing sound near the outdoor unit, or the system running constantly without reaching temperature. If you're regularly topping off refrigerant, you have a leak.
Can't you just add more refrigerant?
We can, but we won't without finding the leak first. Adding refrigerant to a leaking system is illegal under EPA Section 608 for systems over 5 lbs, and it's a waste of your money. The refrigerant will leak out again — we find the source and fix it.
What is a nitrogen pressure test?
We pressurize your refrigerant circuit with dry nitrogen (an inert gas, safe and non-flammable) to well above normal operating pressure. If the system holds pressure, there's no leak. If it drops, we isolate section by section to find exactly where. It's the most reliable leak detection method available.
How much does AC leak detection cost in Brooklyn?
We quote flat-rate upfront before any work starts — no surprise bills after. The diagnostic fee covers pressure testing and electronic detection. If we find and repair the leak in the same visit, the diagnostic is rolled into the repair cost. Call or text for current pricing.
Do you work on mini split systems?
Yes — multi-zone mini splits are one of the most common systems we test. Daikin, Mitsubishi, Fujitsu, LG. Branch box connections and flare fittings are high-failure points on mini splits, and we check every one.
What Brooklyn Customers Say About Our AC Repair
4.9 stars from 57+ verified reviews across Google, Yelp, Thumbtack, and HomeAdvisor
“My AC system stopped working just as a heat wave started. Ben picked up the phone when I called, gave me a realistic assessment of his availability, arrived when he said he would, was straightforward about the cost — and then did a tremendous job.”
Justin V. · June 2025
Verified Customer Review
“I called Brownstone Heating for a second opinion after my heat stopped working during deep freeze temperatures. The first company wanted to charge a high price to dismantle and clean my entire system. Ben offered a much better option — for the same price, he installed a brand new furnace and motor.”
Jonathan B. · February 2026
Verified Customer Review
“Ben has been helping me with my many AC needs for the past few years. He is very reliable, has always found the issue quickly, and has been able to solve it.”
Arturo M. · September 2024
Verified Customer Review