Frozen AC coil in Lake Mary, Florida
Ice on the indoor coil or the copper line at the air handler almost always traces to restricted airflow or low refrigerant. Turn the system off and let it thaw before doing anything else — running it iced risks flooding the compressor with liquid refrigerant.
What is most likely wrong
- Restricted airflow — dirty filter or blocked returns Very common
Ice forms gradually on the indoor coil or the copper suction line at the air handler.
- Low refrigerant charge from a leak Very common
Ice tends to form unevenly; cooling was already weak before the ice appeared.
- Failed or weak blower motor Common
Airflow across the coil drops below what it needs even with a clean filter.
- Dirty evaporator coil Common
Restricts airflow from the inside even when the filter and blower are fine.
- Oversized system short-cycling on a mild day Less common
Rare in Lake Mary’s climate, but a short cycle with little load can ice the coil even with everything else healthy.
What you can safely check yourself
- Turn the system off and set the fan to on (not auto) so it can thaw. Do not run cooling again until the ice is gone.
- The filter, once you can see it — grey and matted is a clear culprit.
- Registers and returns for anything blocking airflow — furniture, closed doors, closed dampers.
- Whether the freeze comes back within a day or two once it has thawed. A fast repeat points at refrigerant, not the filter.
Refrigerant, capacitors and the inside of an electrical panel are not homeowner jobs — a run capacitor holds a lethal charge after the disconnect is pulled, and refrigerant handling requires EPA Section 608 certification under 40 CFR Part 82 subpart F.
In Florida, an air-conditioning contractor licensed under Chapter 489 may replace, disconnect and reconnect the power wiring at the dedicated disconnect — s. 489.105(3) — which is exactly why that scope exists: it is not general household electrical work. Verify any Florida air-conditioning contractor’s licence at myfloridalicense.com.
Why this shows up in Lake Mary and Heathrow
A frozen coil is one of the few AC faults that is worse, not better, in a market that runs the system almost continuously: restricted airflow has less chance to recover between cycles here than in a climate with real shoulder seasons, so a marginal filter or a slow leak turns into ice faster. Orlando records roughly 3,452 cooling degree days a year on NOAA’s 1991–2020 normals.
If the coil keeps freezing after a clean filter and a thaw, ask whether the refrigerant is R-410A or the newer R-454B before authorising a recharge — the two are not interchangeable and a leak in an older R-410A system is a different conversation than a simple top-up. R-410A to R-454B ›
What the fix typically costs
| Item | Researched range | What drives it |
|---|---|---|
| Blower motor, air handler | $450–$900 | Orlando market range; variable-speed motors sit at the top. Clear Comfort Orlando publishes $400–$800. |
| Refrigerant leak search and repair | $400–$1,600 | Orlando; a recharge alone runs about 75 minutes, a leak search adds 2–4 hours on top of it. |
| Evaporator coil replacement | $1,500–$2,500 | Orlando market range, parts and labour. |
Researched Central Florida ranges gathered 12 September 2026 for research/pricing.json: Orlando-metro contractor-published prices corroborated against a third-party Orlando cost guide, with any aggregator figure labelled as such. These are market ranges, not our prices, and not a quote.
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Sources for this page
Researched 6 September 2026. Fees, rebate amounts and code minimums change — check the issuing authority before you rely on a figure.