Evaporator Coil Repair in Leawood, KS
The evaporator coil is the indoor half of your cooling system — the cold coil, usually sitting on top of the furnace, where refrigerant absorbs heat and moisture from your home’s air. When it freezes, leaks, or corrodes, you get weak cooling, water where it shouldn’t be, or a refrigerant loss that starves the whole system. 7th Degree Heating and Air diagnoses and repairs evaporator coil problems in Leawood, and tells you honestly when a coil is worth repairing versus replacing.
What Goes Wrong with Evaporator Coils
Three failure modes dominate. Freezing happens when airflow drops (a dirty filter, blower problem, or fouled coil) or the charge is low — the coil gets cold enough to ice over, which blocks airflow entirely and can damage the compressor. Leaks are common as coils age, and a big driver is formicary corrosion — microscopic “ant-nest” pinholes that form in copper coils, often accelerated by indoor air chemistry. And fouling, where the coil and its condensate pan accumulate biofilm and mineral deposits — a faster process here, where humid summers feed biological growth and WaterOne hard water leaves scale in the condensate path. We diagnose which it is with refrigerant readings, airflow measurement, and a direct inspection.
Repair or Replace the Coil
- A clean fix — a frozen coil from a dirty filter or a fixable airflow restriction is often just that, once the underlying cause is corrected.
- A leaking coil — sometimes repairable, but a coil riddled with formicary corrosion usually needs replacement, and we’ll check whether it’s still under the manufacturer’s parts warranty first.
- An older R-22 system — when a coil fails on an aging unit using phased-out refrigerant, replacing the system is frequently the better value, and we’ll show you the math.
Frequently Asked Questions
- What are the signs of a bad evaporator coil?
- Weak or warm airflow, ice on the indoor coil or refrigerant line, water pooling around the furnace or air handler, a hissing sound, and cooling that gets steadily worse as refrigerant escapes a leaking coil. Because these overlap with other problems, we confirm with instruments before quoting a coil.
- Why do evaporator coils leak?
- The most common cause is formicary corrosion — tiny pinhole channels that form in the copper, often driven by volatile organic compounds in indoor air reacting with moisture on the coil. Age, vibration, and manufacturing factors play in too. The result is a slow refrigerant leak that gradually starves the system, which is why we trace low charge back to its source rather than just recharging.
- Should I repair or replace a leaking coil?
- It depends on the extent of the corrosion, the system’s age, and the refrigerant. A localized leak on a newer system — especially one with a coil still under warranty — may be repairable or warranty-covered. A coil with widespread formicary corrosion, or one on an older R-22 system, usually points toward coil or full-system replacement. We give you the options with real numbers.
- Why does my evaporator coil keep freezing?
- Freezing comes down to airflow or charge. Restricted airflow — a dirty filter, blocked return, or a coil fouled with biofilm and dust — lets the coil get too cold, as does a low refrigerant charge from a leak. We identify which, fix the root cause, and don’t just thaw it and leave. Running a frozen system can also damage the compressor, so it’s worth addressing quickly.
- Does our local climate and water affect the coil?
- Yes. Humid Johnson County summers mean the coil is constantly wet with condensation, which feeds biological growth, and WaterOne hard water leaves mineral deposits in the condensate pan and drain. Both accelerate fouling and the corrosion that leads to leaks, which is why coil and condensate inspection is part of our regular maintenance here.
Contact 7th Degree Heating and Air
Serving Leawood, Overland Park, Prairie Village, Mission, Merriam, and Lenexa with expert coil diagnosis and 24/7 emergency repair.
- Emergency Line (24/7): (913) 354-6552
- Address: 12720 Catalina St, Leawood, KS 66209
- Email: info@7thdegreeheatingandair.xyz
- Johnson County Class “DM” Mechanical License: DM-24-11873
- EPA Section 608 Universal: EPA-608-U-457921
Office Hours
- Emergency Service: 24 hours a day, 7 days a week
- Office Staff: Monday – Saturday, 9:00 AM – 5:00 PM
- Sunday: By appointment
- Closed: Holidays (emergency line always active)