EVAPORATOR COIL SERVICE

Your evaporator coil is the indoor half of your AC — it's where the refrigerant absorbs heat and humidity out of your air. When it freezes over, clogs with dust and biofilm, or springs a slow leak, cooling drops off, bills climb, and you can end up with water where it shouldn't be. Mark Johnson & Sons diagnoses and services evaporator coils across Ruston, Monroe, West Monroe, Shreveport, Bossier City, and Grambling.

A frozen coil is almost always a symptom of something else — low refrigerant from a leak, restricted airflow from a dirty filter or blower, or a failing metering device. We find the real cause instead of just thawing it and handing you a bill. On our long, humid summers a coil runs wet for months, and that moisture is exactly what dust, mold, and corrosion feed on.

What goes wrong with a coil

• It freezes — low charge or weak airflow drops the coil below 32°F and it ices over, choking cooling and risking the compressor
• It clogs — dust and biofilm cake the fins, insulating the coil and cutting capacity and airflow
• It leaks — formicary "pinhole" corrosion, common on aluminum coils in humid climates, lets refrigerant escape
• The drain backs up — a plugged condensate line overflows the pan and stains ceilings or floods a closet

Clean, repair, or replace

A dirty coil almost always comes back with a proper deep clean — pulled, treated, and rinsed to restore capacity and airflow. A leaking coil is a bigger decision: a matched replacement coil runs $1,200–$2,800, and if the AC is already 10-plus years old or the compressor is weak, we'll show you the math on replacing the coil versus the whole system. We service coils in every major brand — Carrier, Trane, Lennox, Goodman, Rheem, York, American Standard, Bryant, and Amana.

What Mark Johnson & Sons does differently

We don't guess. Every frozen or weak-cooling call gets a full check — airflow, static pressure, refrigerant charge, blower, and metering device — so the fix holds instead of freezing up again next week. When we replace a coil we pull a real vacuum, weigh in the correct charge, and verify the temperature drop across the coil before we leave. Ask about our Classic Membership — the Spring AC tune-up includes cleaning and inspecting the coil, which is the single best way to keep it from clogging or freezing in the first place.