Refrigerant Leak Detection & Recharge in Denver Tech Center, CO

Refrigerant leaks can develop at dozens of points throughout an AC system. Some are immediately accessible and repairable; others require coil replacement or significant disassembly. Common leak locations include:

• Evaporator coil (indoor coil), formicary corrosion, manufacturing defects, or freeze damage
• Condenser coil (outdoor unit), hail damage, debris damage, corrosion at fin-tube joints
• Refrigerant line set, punctures, kinks, or corrosion in the lines running between indoor and outdoor units
• Service valves and Schrader valves, most common source of small slow leaks
• Brazed joints, failed solder connections from original installation or prior repair
• Expansion valve or TXV, failed seals or internal damage
• Compressor, failed seals, cracked housings, or worn shaft seals
• Filter drier, corrosion, manufacturing defects, or freeze damage

The location and size of the leak determine whether repair is practical or whether replacement of a major component (or the whole system) is the better answer. A pinhole leak at a Schrader valve is a 30-minute fix. A leaking evaporator coil typically requires coil replacement ($1,200-$2,500). A compressor leak often means replacing the compressor ($2,500-$5,000) or the entire outdoor unit.

Finding refrigerant leaks requires a combination of techniques because different leak sizes and locations respond to different detection methods:

Visual Inspection

We begin with a thorough visual inspection of the outdoor unit, indoor coil, line set, and service valves. Oil stains around fittings are a strong indicator of leaks (refrigerant carries compressor oil, which marks leak locations). Visible damage from hail, debris, or installation issues is documented and photographed.

Electronic Leak Detection

Modern electronic leak detectors sense refrigerant in the air around fittings and joints. They are extremely sensitive and effective for finding moderate-sized leaks. We use industry-leading detectors calibrated for the specific refrigerant in your system.

UV Dye Tracing

For elusive intermittent leaks, we add fluorescent dye to the system, run it for a period, and then inspect with UV lights to locate where the dye has emerged. Particularly useful for slow leaks that electronic detectors miss.

Nitrogen Pressure Testing

After repair, we pressurize the system with dry nitrogen and monitor for pressure drop over time. This verifies the repair is leak-tight before adding refrigerant, which is both an EPA requirement and a quality-control best practice.

Standing Vacuum Test

After successful pressure testing, we pull the system into deep vacuum and verify the vacuum holds, a final check for leaks too small to detect with pressure testing and confirmation that the system is moisture-free before refrigerant introduction.

R-22 (Freon), Phased Out

R-22 was the dominant residential AC refrigerant for decades. Production was banned January 1, 2020, and existing supplies have become increasingly expensive (often $100-$200+ per pound at recovery, when available). Systems using R-22 typically date from before 2010. A single significant R-22 leak repair can easily cost $1,000-$2,000 just in refrigerant, making repair often impractical and replacement more sensible. MSI provides honest cost comparisons for R-22 systems.

R-410A, Current Standard, Now Phasing Out

R-410A was the standard residential AC refrigerant from 2010 through 2024. It is still available for service of existing systems, and pricing remains reasonable, but federal regulations have phased it out of new equipment production as of January 2025. Existing R-410A systems can be serviced normally for years to come, we maintain full supply for current customers.

R-454B and R-32, The Current New Equipment Standards

All new residential AC and heat pump equipment produced for the U.S. market from 2025 forward uses A2L refrigerants, primarily R-454B (used by Carrier and most other major manufacturers) and R-32 (used by some Asian brands). These refrigerants have dramatically lower global warming potential than R-410A, are mildly flammable (Class A2L), and require updated handling procedures and equipment. MSI's technicians are factory-trained and certified on the new refrigerants.

Federal EPA regulations under Section 608 of the Clean Air Act require that leaking refrigerant systems be repaired (not just topped off) if leak rates exceed certain thresholds. For residential systems with 5+ pounds of refrigerant, leak rates above 10 percent annually require repair within 30 days. For systems with less than 5 pounds, the rules are slightly less strict but still require leak detection and good-faith repair efforts.

Beyond regulatory compliance, repeated recharging without repair is bad practice for the homeowner: you pay for refrigerant that immediately starts leaking out, your system operates poorly, your bills climb as efficiency drops, and your equipment wears out faster. MSI follows the law and applies professional best practices: find the leak, repair it when possible, verify the repair, then recharge properly. If a leak cannot be repaired economically, we provide an honest replacement recommendation.

• Certified Carrier Factory Authorized Dealer, the industry's highest dealer credential
• Established in 1998, over 27 years of Colorado HVAC experience
• Trusted by Denver Health, EPA Region 8, NREL, and the Denver Public Library
• Fully licensed Colorado mechanical and plumbing contractor (P.C.0003362, M.P.00179722)
• BBB Accredited Business
• 24/7 emergency cooling repair across the Denver metro area
• Service, repair, and maintenance for all major air conditioning brands
• In-house, factory-trained technicians, no subcontractors
• Free in-home estimates on new installations and replacements
• Financing options available on qualifying installations
• Maintenance plans available to extend system life and protect efficiency

How much does refrigerant recharge cost in Denver Tech Center, CO?

Pricing depends on refrigerant type and quantity. R-410A recharge typically costs $80-$150 per pound. R-454B recharge typically costs $100-$200 per pound. R-22 recharge (when available) typically costs $100-$200+ per pound. Diagnostic time and leak repair are separate charges. A typical residential AC holds 4-8 pounds of refrigerant. MSI provides up-front pricing before any work begins.

Why is my AC low on refrigerant?

Because there is a leak. Refrigerant operates in a sealed system and does not get "used up" or evaporate normally. If your AC is low, refrigerant is escaping somewhere, and finding and fixing that leak is the right approach rather than repeatedly recharging.

How can I tell if my AC has a refrigerant leak?

Common signs: gradual reduction in cooling capacity over a season or two, ice forming on the indoor coil or refrigerant line, hissing or bubbling sounds near the equipment, oily residue around joints or fittings, longer run times to reach setpoint, and progressively higher electric bills. If you suspect a leak, schedule a diagnostic visit rather than continuing to run an undercharged system, which damages the compressor.

Should I repair the leak or replace the system?

It depends on the location of the leak, the age of the system, and the refrigerant type. Small accessible leaks (Schrader valves, accessible joints) are usually worth repairing on any system. Major leaks (evaporator coil, compressor) on systems 10+ years old often favor replacement. Any significant leak on an R-22 system almost always favors replacement. MSI provides an honest cost comparison rather than just selling the most expensive option.

How long does refrigerant work take?

Simple recharge after a known repair takes 1-2 hours. Full leak detection visits take 2-4 hours. Significant repairs (coil replacement, line set repair) can take a full day. MSI provides time estimates with every quote.

Is my old R-22 system safe to keep running?

If it is running normally and not leaking, yes. The issue with R-22 systems is not safety, it is the increasing cost of refrigerant when service is needed. R-22 itself is no more or less safe than current refrigerants. The economics simply favor replacement once repair costs add up.

If your AC is not cooling like it used to, has ice on the lines, or you have been quoted repeated refrigerant top-offs without a leak repair, call MSI. Our EPA-certified technicians find leaks, fix them properly, and get your system back to factory specifications.