AC not turning on in Lake Mary, Florida
When nothing responds at all — no fan, no compressor, no thermostat display — the fault is almost always electrical: power to the unit, or the low-voltage control circuit that tells it to start.
What is most likely wrong
- Tripped breaker Very common
Nothing runs anywhere: no fan, no compressor, no display.
- Dead or miswired thermostat Very common
Blank or unresponsive display; batteries if it takes them.
- Blown fuse or pulled disconnect at the condenser Common
Indoor blower may run; outdoor unit is completely silent.
- Failed contactor Common
A buzz or chatter at the outdoor disconnect, or nothing at all.
- Failed capacitor preventing a hard start Common
A hum with no spin, then the unit trips off on overload.
- Failed control board or transformer Less common
Thermostat is dead even with fresh batteries; usually needs a part ordered.
What you can safely check yourself
- Both breakers; reset a tripped one once.
- Thermostat batteries, and the screen for a blank or frozen display.
- The outdoor disconnect pull-out, fully seated.
- Whether the indoor blower runs at all when the thermostat calls for cooling — that narrows it to the outdoor side or the control side.
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 completely dead system is one of the few AC faults where the local housing stock matters less than the electrical panel itself. The one Lake Mary-specific wrinkle: in Heathrow and the other 1985–2019 pockets, some homes run two or three separate systems, so a dead unit does not always mean a dead house — check whether the other zone or system is still running before assuming a whole-house outage.
Orlando runs roughly 3,452 cooling degree days a year on NOAA’s 1991–2020 normals, so a capacitor or contactor here accumulates start cycles faster than the same part in a four-season climate — which is why those two parts show up at both ends of this list, as a cause of no cooling and of no starting at all.
What the fix typically costs
| Item | Researched range | What drives it |
|---|---|---|
| Contactor replacement | $150–$350 | Orlando market range; Clear Comfort Orlando publishes $150–$250. |
| Capacitor replacement | $150–$400 | Orlando market range. Clear Comfort Orlando, which lists Lake Mary in its service area, publishes $150–$300. |
| Control board replacement | $400–$800 | Orlando; often requires a part to be ordered. |
| Thermostat replacement | $180–$500 | Orlando market range; smart thermostats sit at the top. |
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.