The August bill lands and it's ugly. Before buying gadgets or blaming the power company, walk this diagnostic in order — it's sorted by how often each culprit is actually guilty in Tampa Bay homes.
1. The AC itself (the usual suspect, fairly)
- ▸Age: systems past 10-12 Florida years can cost meaningfully more per cooling hour than modern equipment — efficiency erodes before it fails.
- ▸Charge and condition: low refrigerant or a dirty condenser coil makes the system run longer for the same cooling. A tune-up pays for itself here.
- ▸Short-cycling or endless running are both bill multipliers with mechanical causes.
2. The distribution (the sneaky one)
Leaky attic ducts can waste a serious share of everything the system produces — you're paying to cool the attic. Wet insulation under ducts, dusty returns, and rooms that never match the thermostat all point here. Duct sealing is often the best payback-per-dollar on this whole list.
3. The house
- ▸Attic insulation settled below par, or ventilation failing (attic at 140° = ceiling radiating heat all evening).
- ▸West-facing glass without shade — each big unshaded window is a space heater at 4pm.
- ▸Water heater: the #2 energy user; an old tank or a leaking hot-water line runs the meter quietly.
- ▸Pool pump schedules — a legacy single-speed pump on long hours is a hidden hundred-dollar line item.
4. The habits
Fan ON instead of AUTO (re-humidifies the house and runs the blower 24/7), aggressive thermostat drops that trigger long recovery runs, and cooling an empty house all day. Free fixes, real dollars.
The order of operations
- Tune-up + filter + coil rinse (cheap, immediate).
- Duct inspection and sealing (best hidden payback).
- Thermostat schedule/geofencing (free to cheap).
- Insulation/ventilation if the attic audit says so.
- Equipment upgrade last — sized right, after the house stops leaking what you already pay to cool.
Want the diagnostic done for real? A Comfort Club tune-up includes the coil, charge, and duct once-over.