Why your energy bill spikes in summer (and how ducts fix it)
A dirty blower can rob a large share of your HVAC efficiency. Cleaner ducts pay for themselves.
When cooling costs jump without a rate change, the cause is usually airflow — not the thermostat. Dirty coils, a caked blower wheel, and restricted returns force your system to run longer for the same result.
Where the losses come from
A blower wheel coated in dust moves noticeably less air per rotation. An evaporator coil with a dust film transfers less heat. Return ducts starved for air make the compressor cycle longer.
Add leaky duct joints in an unconditioned attic and you're paying to cool the space above your ceiling.
What a cleaning actually changes
After a full system clean — supply lines, returns, blower, and coil — most homeowners see faster cool-down times, more even temperatures between rooms, and a quieter system. Lower runtime is where the savings come from.
Do this too
Change filters every 90 days, keep two feet clear around the outdoor condenser, and seal any accessible duct joints with mastic rather than cloth tape.
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