Why Are My Electric Bills So High in Austin?

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When it’s 100 degrees for weeks, some bill increase is normal. Your AC runs more. But if your bill is way higher than your neighbors’, higher than last summer in similar weather, or keeps climbing even after you replaced the AC, something in the house is usually wasting energy. Here are the most common causes we find in Austin homes.

Common Causes of High Electric Bills in Austin

1. Leaky Ducts in a Hot Attic

In most Austin homes, the ductwork runs through the attic, which can get far hotter than the outdoors on a summer afternoon. If those ducts leak, cooled air you already paid for gets dumped into the attic, and on the return side the system can pull superheated attic air back in. The AC keeps running to make up for it. Duct leaks are hidden, so most homeowners never know they have them. Checking duct leakage is part of our Home Diagnostic Energy Audit.

2. Air Leakage Through the House

Gaps around attic hatches, recessed lights, plumbing and wiring holes, and doors and windows let hot outdoor and attic air into the living space. A blower door test pressurizes the house and measures exactly how leaky it is. For a sense of scale, Austin’s energy code requires new homes to come in at or under 4.0 ACH50; older homes are often well above that.

3. Insulation Gaps or Thin Attic Insulation

Insulation settles, gets disturbed by contractors, or was never installed evenly. Thin spots let attic heat radiate down into the rooms below. An infrared camera makes these gaps visible as hot spots on ceilings and walls.

4. An AC That’s Oversized, Undersized, or Struggling

An undersized system runs nonstop on hot days. An oversized one short-cycles, wastes energy, and doesn’t dry the air well. An aging or poorly performing system can also use more power than it should. We check the system’s age, condition and whether it’s sized properly for the home.

5. Return Air Problems

If the system can’t pull enough air back through its returns, or a return is leaking or disconnected, it works harder and can draw attic air into the system. Closed bedroom doors with no return path can make this worse.

6. Windows and Doors

Worn weatherstripping and leaky window frames add up. Thermal imaging often shows frames leaking more than the glass itself, especially on west-facing walls.

Why a New AC Doesn’t Always Fix the Bill

One of the most common things we hear is “I replaced the AC and my bill barely moved.” That usually means the AC wasn’t the main problem. If the ducts leak into the attic or the house leaks air, a new system just cools that waste more efficiently. Find the leaks first, then decide where to spend your money.

When to Call a Pro, and What a Diagnostic Finds

Call for a diagnostic if:

• Your bill spikes every summer and nobody can explain why
• One room is always much hotter than the rest
• You replaced the AC and the bills barely changed
• You bought an older home and suspect it leaks

During a Home Diagnostic Energy Audit, a BPI certified auditor runs a blower door test, scans the home with an infrared camera, checks duct leakage, insulation and your HVAC system, and looks at windows and doors. You get a PDF report with fixes ranked by energy impact, biggest savings first, plus our trusted Austin contractor list so you know who to call. The visit usually takes 1.5 to 2.5 hours, and someone needs to be home.

Selling your home? You probably need an ECAD audit instead, which starts at $129. The Home Diagnostic is for homeowners who want to find and fix the problem.

Frequently Asked Questions

Why did my electric bill go up so much this summer?

Hotter weather makes the AC run longer, but a big jump usually points to the house: leaky ducts in the attic, air leaks, insulation gaps or an AC that is struggling. A diagnostic audit shows which one applies to your home.

Will a new AC lower my electric bill?

Not always. If ducts leak into the attic or the house leaks air, a new system still has to make up for that waste. It’s worth finding the leaks before replacing equipment.

How do I find out what’s causing my high bill?

A Home Diagnostic Energy Audit uses a blower door test, an infrared camera scan, and duct, insulation and HVAC checks to pinpoint where energy is being lost, then ranks the fixes by impact.

How much does a home energy diagnostic cost in Austin?

Green Leaf’s Home Diagnostic Energy Audit starts at $299, depending on home size. Call (512) 922-7522 to confirm pricing for your home.