The $300 Electric Bill Frustration
I'm Omar Jacobo, and this is one of the most frustrating calls I get: "Omar, I just spent $12,000 on a new AC system and my summer bills are still $300+. What's going on?"
It's a fair question. You bought a high-efficiency system expecting lower bills. The equipment is working perfectly. But your bills barely changed. Here's why — and the answer is something your AC installer may not have mentioned.
Your Ductwork Is the Problem
Your new AC produces perfectly cooled air. But that air has to travel through 30–80 feet of ductwork in your 140–160°F attic before reaching your rooms. If that ductwork is 15–20 years old (which it is in most Farmers Branch, Irving, and Coppell homes), here's what's happening:
- 20–30% of conditioned air escapes through leaks — tears, disconnected joints, and failed duct tape connections dump cold air directly into your attic.
- Degraded insulation lets heat in — R-6 insulation when new → R-2 after 15 years in Texas heat. Your 55°F supply air warms significantly before reaching rooms.
- Your system runs 30–40% longer — to compensate for the losses, your AC cycles longer and more frequently, consuming more electricity.
You essentially bought a new engine but left it connected to a leaking exhaust system.
The Numbers Don't Lie
Let's do the math for a typical Texas home:
- Average Texas electricity rate: 13.8¢/kWh (Oncor territory, March 2026). Cheapest fixed rate: 8.4¢/kWh.
- Average local monthly usage: 1,200–1,400 kWh. Summer peak: 2,000–2,500 kWh.
- Average local monthly bill: $155–$185. Summer bills for older/larger homes: $250–$400+.
- HVAC = 50–60% of your bill — in a Texas summer, heating and cooling dominate your electricity use.
If your ductwork is leaking 30% of cooling:
- Monthly waste: $50–$100 (you're paying to cool your attic)
- Annual waste: $600–$1,200
- 10-year waste: $6,000–$12,000
That's $6,000–$12,000 over a decade spent on air that never reached your living space. Want to see your specific numbers? Try our energy savings calculator — input your system age, bill, and home size to see projected savings.
Why the AC Installer Didn't Fix This
Most AC replacements in Texas are equipment-only: new outdoor condenser, new indoor coil, maybe a new air handler. The installer connects the new equipment to your existing ductwork and moves on. It's faster, cheaper, and the homeowner doesn't want to add $3,000–$8,000 for new ducts on top of the system cost.
I get it. But it's like putting premium gas in a car with four flat tires. The engine is great — but the delivery system is failing.
The ERCOT Factor
Texas runs on the ERCOT grid (42% natural gas, 24% wind, 13% coal, 12% solar, 9% nuclear). During extreme heat events, electricity prices spike and providers can increase variable rates. Our area averages 15–20 days above 100°F per year and approximately 2,600 cooling degree days annually — one of the highest in the US.
Every percentage of efficiency you gain with sealed ductwork compounds during peak demand when rates are highest.
What New Ductwork Does for Your Bill
Most homeowners in our area see summer bills drop 25–40% after ductwork replacement. On a $350/month summer bill, that's $88–$140/month in savings — $500–$840 over the summer alone. Combined with a high-efficiency system, total energy savings can exceed $100/month year-round.
New ductwork with mastic sealing (rated 180°F+ for Texas attics) and proper R-6/R-8 insulation means 100% of your cooled air reaches your rooms. Your system runs shorter cycles, uses less energy, and your home stays more comfortable.
See exactly what deteriorated ductwork looks like and why it fails: Interactive Ductwork Health Tool
Call Omar at (469) 254-0548 or See My AC Price online. We serve Farmers Branch, Coppell, Irving, Flower Mound, Lewisville, and Grapevine.
Related: Why some rooms won't cool down | Why your allergies are worse indoors | Financing options