In a Georgia summer, cooling is often around half your power bill, so a jump usually traces back to the HVAC system. The common causes are a dirty filter, low refrigerant, leaking ductwork, an aging system losing efficiency, and thermostat habits. The first is free to fix. The rest need looking at.
Restricted airflow makes the blower work harder and the system run longer to hit the same temperature. It is the cheapest thing on this list to fix and the most commonly neglected.
Every degree lower costs meaningfully more to maintain. Setting it to 68 does not cool the house faster, it just runs the system longer once it gets there. If the house is empty during the day, letting it drift up a few degrees and come back down saves more than most people expect.
An undercharged system runs constantly and never quite satisfies the thermostat. Long run times, high bills, and a house that is never quite comfortable is a classic pattern. And low means leaking.
This one surprises people. Ducts in a hot attic that have come apart at a joint or torn are dumping cooled air into the attic. You are paying to cool a space you never occupy. In older homes here we regularly find flex duct that has separated or crushed, and repairing it can make an immediate difference.
Efficiency declines with age. A system past 12 to 15 years simply costs more to run for the same cooling, and at some point the running cost tips the balance toward replacement. Our piece on repairing versus replacing walks through where that line sits.
Compare like for like before you panic. Look at the same month last year rather than last month, and check the number of billing days. A hotter than average July will raise the bill on a perfectly healthy system. A big jump against the same month last year is the signal worth chasing.
Common Questions
In a hot, humid climate like Southeast Georgia, cooling commonly accounts for roughly half of a household's summer electricity use. That is why a sudden jump in the bill so often traces back to the HVAC system rather than anything else in the house.
No. The system cools at the same rate regardless of the setting. Setting it much lower than you need simply makes it run longer once it reaches temperature, which costs more without getting you comfortable any sooner.
Yes, significantly. Ductwork that has separated or torn in a hot attic releases cooled air into an unoccupied space, so the system runs longer to cool the rooms you actually use. It is a common find in older homes and is often straightforward to repair.
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