How North Texas Homeowners Can Keep Their Home More Energy Efficient This Summer

by OnDemand Realty

How North Texas Homeowners Can Keep Their Home More Energy Efficient This Summer

If you've lived in DFW for more than one summer, you already know the feeling. You keep the blinds shut, you don't touch the thermostat, you run the ceiling fans — and you still open a $350 electric bill in August. You call your cousin in Ohio, who pays $90 a month and thinks you must be doing something wrong.

You're not doing anything wrong. You're just fighting a different problem than most of the country.

North Texas summers are genuinely extreme. Temperatures routinely exceed 100°F from June through September. Your air conditioning system may run continuously for days without cycling off. And in 2026, the situation is getting more expensive — ERCOT wholesale electricity prices are projected up roughly 45% compared to last year, driven largely by the explosive growth of data centers in DFW. OpenAI, SoftBank, and Oracle all have major construction underway in Texas, and that demand is reshaping the grid during the hours you need it most.

The generic energy efficiency advice you find online — swap your light bulbs, unplug phone chargers, wash clothes in cold water — is written for the national average. It's not wrong exactly, but it's not the right conversation for a homeowner in Frisco or Celina or McKinney with a 2,800-square-foot house and a $380 July electric bill. This post is.

First: Understand What You're Actually Fighting

Air conditioning accounts for 50 to 60 percent of your total electricity usage during July and August. Everything else — appliances, lights, electronics, the refrigerator — is almost noise by comparison. This means that almost every significant energy saving opportunity in a North Texas home in summer runs through your HVAC system, your attic, or the conditions that force your AC to work harder than it should.

Texas electricity rates are actually about 10 percent below the national average. The reason your bills are still high is consumption — Texans use 27 percent more electricity than the average American household because the AC runs so much longer. You're not paying more per kilowatt-hour. You're just burning through a lot more of them.

Keep that in mind as you work through this list. The goal isn't to make your home uncomfortable. It's to reduce how hard your AC has to work to keep it comfortable.

Step One: Shop Your Electricity Rate Right Now

Before you do anything physical to your home, spend 15 minutes on PowerToChoose.org — the Public Utility Commission of Texas's official electricity rate comparison site. Enter your zip code, filter for fixed-rate plans, and look at the all-in average price per kilowatt-hour at 1,000 kWh usage.

Here's why this matters right now: Spring is when Texas electricity rates are at their lowest. Providers compete aggressively for summer contracts while demand is mild. Once June arrives and temperatures climb, that window closes. If you're currently on a month-to-month plan or a variable-rate plan, you are directly exposed to the summer pricing spikes that ERCOT is projecting for 2026.

The difference between a bad electricity plan and a good one can easily be $50 to $100 per month on a DFW home during summer. Switching from a 16-cent plan to an 11-cent plan saves approximately $50 per month at 1,000 kWh usage — and in July and August when your usage climbs to 1,500 or 2,000 kWh, that same rate difference saves even more.

This is free, it takes 15 minutes, and it's the single highest-impact move available to most North Texas homeowners. Do it before anything else.

A few things to know when comparing plans: Always look at the Electricity Facts Label (EFL) for any plan you're considering — it's required by the PUC and lays out all fees and rate structures clearly. Some plans look cheap but have base charges or bill credits that only apply at exactly 1,000 kWh usage, making them more expensive above or below that threshold. Read the fine print. And lock in a 12-month fixed rate — in the current ERCOT environment, that's meaningful price protection.

The Attic: Your Biggest Problem and Your Biggest Opportunity

Most energy efficiency advice glosses over the attic. In North Texas, the attic deserves its own chapter.

On a 105°F July afternoon in DFW, the air temperature inside an unimproved attic can reach 140 to 150°F. That superheated air radiates heat downward through your ceiling into your living space. Worse, your ductwork runs through that attic — meaning the 55°F air your AC just produced has to travel through a 140-degree oven before it ever reaches your vents. Your system isn't just fighting the outdoor temperature. It's fighting a radiant heat source sitting directly above everything you're trying to cool.

Radiant Barriers

A radiant barrier is a highly reflective aluminum foil material installed along the roof rafters in your attic. It reflects the sun's radiant heat back upward rather than allowing it to radiate down into the attic space. Unlike in cooler climates where the payback period can be long, North Texas's extreme solar heat load makes radiant barriers one of the most cost-appropriate upgrades available.

Local DFW contractors consistently report attic temperature reductions of 20 to 45 degrees after installation. That directly reduces both the heat your ceiling absorbs and the heat your ductwork has to pass through. The result is less AC runtime and lower monthly bills. Installation for a typical DFW home runs $1,500 to $3,500. Many homes built after 2015 include radiant barrier roof decking as a standard feature — look for shiny foil on the underside of the roof sheathing in your attic.

Insulation Levels

The Department of Energy recommends R-38 to R-60 of attic insulation for North Texas (Climate Zone 3). Many DFW homes built before 2000 have R-19 or less — sometimes significantly less after years of settling and compression. Adding blown-in insulation to bring your attic up to R-38 minimum is one of the highest-ROI physical upgrades available, with typical payback periods of two to five years through reduced cooling costs.

The radiant barrier and blown-in insulation combination is what DFW HVAC professionals consistently point to as the highest-impact attic approach. They address different types of heat transfer — the barrier handles radiant heat, while insulation handles conduction — and they work better together than either does alone.

Ductwork

While you're having any attic work done, have the contractor inspect your ductwork. Leaky ducts in a 140°F attic bleed conditioned air directly into the heat before it reaches your vents. Some DFW homes lose 20 to 30 percent of their cooled air through duct leaks. Duct sealing isn't glamorous, but it's one of the most impactful efficiency improvements available and is frequently overlooked.

Your HVAC System: Maintenance, Filters, and Replacement

Schedule Your Tune-Up in March or April

An annual pre-season HVAC tune-up is non-negotiable for a system that runs 2,000+ hours per cooling season. Schedule it in March or April — before the summer rush. By June, every HVAC company in DFW is slammed and emergency service calls command premium pricing.

A tune-up ($75 to $150) covers refrigerant levels, coil cleaning, capacitor testing (capacitors are the most common summer failure point in Texas heat), drain line cleaning (clogged drain lines are the most common cause of AC shutdowns in DFW), and a general systems check. A well-maintained system runs 5 to 15 percent more efficiently than a neglected one — on a larger North Texas home, that's $30 to $80 per month during peak summer.

Change Your Filter More Often Than You Think

The standard advice says replace your air filter every 90 days. For North Texas summers, check it every 30 days and replace it every 30 to 45 days. DFW has high levels of construction dust, pollen, and clay particulates that clog filters faster than the national baseline. A restricted filter forces the blower motor to work harder, reduces airflow to your rooms, and can add 5 to 15 percent to operating costs. It's a $15 fix with real impact.

When to Replace an Aging System

If your AC is more than 12 to 15 years old and struggles to hold temperature on a 100°F day, the economics likely favor replacement over continued repair. An old, inefficient unit can cost $50 to $100 more per month than a modern high-efficiency system during peak summer — and that premium compounds over a six-month cooling season.

Current federal minimums for new AC systems in the South region are SEER2 15. For DFW specifically, HVAC professionals generally recommend SEER2 16 as a minimum — which also happens to be the threshold for Oncor rebates. Oncor currently offers up to $600 per unit for qualifying systems rated SEER2 16 or higher. These rebates can be stacked with manufacturer seasonal rebates, which often run $300 to $1,500 on qualifying equipment.

One important note on incentives: the federal Section 25C energy efficiency tax credit — which previously covered HVAC upgrades and insulation — expired on December 31, 2025. If a contractor tells you that you can claim it on a 2026 purchase, that's not accurate. Verify current incentive availability directly with Oncor before making purchasing decisions.

Smart Thermostat Strategy for DFW

A smart thermostat's value in North Texas isn't the thermostat itself — it's the automation. Maintaining a disciplined setback schedule manually through a six-month cooling season is something most people don't actually do consistently. The thermostat does it for you.

The numbers that matter: Every degree you lower your thermostat below 78°F adds approximately 3 to 5 percent to your cooling costs. Setting to 72°F instead of 78°F can cost an extra $30 to $50 per month. The general guidance:

When home: 76 to 78°F, with ceiling fans in occupied rooms
When away for more than 4 hours: 82 to 85°F
Peak hours (2 PM to 9 PM): Allow to drift up 2 to 3 degrees from your comfort setting
Overnight: 74 to 76°F with bedroom ceiling fans

Geofencing is the feature that makes a smart thermostat genuinely earn its cost in DFW. It uses your phone's GPS to detect when you've left and when you're approaching home, automatically setting back when you leave and beginning to pre-cool before you arrive. The average working household's AC runs 4 to 6 hours in an empty house on a North Texas summer day without this automation.

Pre-cooling is a particularly effective strategy for DFW. Cool the home to 73 or 74°F by noon, then let the thermal mass of the home allow temperatures to drift up naturally through the peak afternoon hours while running the AC minimally — the hottest and most electrically expensive time of day. This works best in well-insulated homes with a radiant barrier that slows the afternoon heat gain.

The ceiling fan math: A ceiling fan makes you feel 4 to 6 degrees cooler through wind chill, costs about 1 cent per hour to run, and allows you to set your thermostat 4 degrees higher without any loss of comfort. The one rule: turn fans off when you leave the room. Fans cool people, not rooms. A fan running in an empty space wastes electricity and generates slight motor heat.

Air Sealing: The Underrated Fix

Your AC produces cold air. Air sealing keeps it inside. Every gap around a door, window, electrical outlet, or attic penetration is a direct leak — from your 76°F living room to the 105°F outdoors, or directly into a 140°F attic above.

The highest-impact locations to check and seal:

Door frames — Weatherstripping compresses and degrades every 3 to 5 years. Close a door on a piece of paper. If you can pull it out, you're losing conditioned air and need new weatherstripping. This is a $10 fix per door.

Attic hatch — One of the most significant and most overlooked air leak points in any home. An unsealed attic hatch creates a direct chimney between your living space and the 140°F attic above. Add a foam gasket and weatherstripping to the hatch perimeter.

Recessed light fixtures — Older recessed lights (particularly those installed before 2010) are notorious air leak points between the conditioned space and the attic. Foam gasket retrofit kits are inexpensive and available at any home improvement store.

Window frames — In DFW homes built in the 1980s and 1990s, exterior window caulking frequently degrades and cracks. Re-caulking exterior window frames is a $5 to $10 per window improvement with immediate impact.

Plumbing and electrical penetrations — Any pipe or wire that runs through the attic floor is a potential air leak. Spray foam or fire-rated caulk addresses these in a few minutes each.

Done properly, air sealing typically saves $20 to $50 per month on summer cooling in a DFW home. Most of it is DIY-appropriate and costs under $50 in materials.

Windows and Afternoon Sun

West and south-facing windows in the afternoon hours are aggressive solar heat gain sources in every North Texas home. The sun is low on the horizon, temperatures are at their daily peak, and direct sunlight through unshaded glass dumps a significant heat load directly into your living space.

The most effective window interventions block heat before it reaches the glass. Interior curtains and blinds help, but they absorb solar radiation and re-radiate some of it as heat into the room. Exterior solutions are categorically more effective.

Solar screens are mesh screen material installed over exterior windows that block 65 to 90 percent of solar radiation before it hits the glass. They're widely available from DFW screen companies, relatively inexpensive, and highly effective on west and south-facing windows. Many DFW homeowners treat west-facing solar screens as a standard improvement rather than an upgrade.

Window film can block 40 to 80 percent of solar heat gain through existing windows. It's significantly less expensive than window replacement and is particularly cost-effective for west-facing windows in older homes without low-E glass coatings. Professional installation runs $8 to $15 per square foot; DIY film is available at lower cost.

Closing blinds and curtains on west and south-facing windows from noon onward is a daily habit that can reduce solar heat gain by 30 to 50 percent at essentially no cost. It sounds obvious. Most people don't do it consistently. In a home without exterior solar screens, this is the highest-impact daily behavior change available.

For buyers looking at new construction: most North Texas homes built after 2015 include low-E glass coatings as a standard feature. Low-E glass blocks the solar infrared spectrum while allowing visible light through — it's built-in solar control that performs significantly better than clear glass.

Daily Habits That Actually Matter

Behavioral changes won't overcome a 105°F afternoon if your attic is 145°F and your AC is 15 years old. But in a well-maintained home, these habits contribute meaningfully.

Shift heat-generating appliances to cooler hours. Ovens, dryers, and dishwashers generate significant heat. Running them before 10 AM or after 9 PM avoids adding a heat load during peak afternoon hours. On a time-of-use electricity plan, this also directly reduces the cost per kilowatt-hour during those runs.

Use exhaust fans during cooking and showering. Kitchen and bathroom exhaust fans remove both heat and moisture directly from the home. Run them during and for 15 to 20 minutes after cooking or showering. Make sure they're actually exhausting to the exterior — not into the attic, which is unfortunately common in older DFW construction.

Set the AC fan to "Auto," not "On." The "On" setting runs the blower continuously regardless of whether the system is actively cooling. It adds motor heat and uses electricity with no cooling benefit between cycles. "Auto" runs the fan only when the system is cooling. Many DFW homeowners leave this set incorrectly for years without realizing it.

Consider a smart irrigation controller. This one isn't on most energy efficiency lists but is particularly relevant in North Texas. DFW's expansive clay soil shrinks and swells with moisture changes — and that's the primary driver of foundation movement. A smart irrigation controller (Rachio is the most popular option in DFW) that adjusts schedules based on soil moisture and local weather typically reduces outdoor water use 30 to 50 percent, lowering both the water bill and any energy cost associated with the irrigation system. It also helps maintain the consistent soil moisture that DFW foundations depend on.

Where to Start: The Priority Order

If you're looking at this list and wondering where to put your time and money first, here's the honest priority order for a North Texas homeowner:

Shop your electricity rate on PowerToChoose.org. Free, 15 minutes, lock in a fixed rate before summer. Potential savings: $50 to $100 per month. Do this today.
Adjust your thermostat strategy. Set to 78°F when home, 82 to 85°F when away, use ceiling fans in occupied rooms. Install a smart thermostat if you don't have one. Potential savings: $20 to $50 per month.
Attic radiant barrier and blown-in insulation. The highest-ROI physical upgrade for DFW's climate. Typical installed cost: $2,000 to $5,000 combined. Potential savings: $30 to $80 per month.
Schedule an HVAC tune-up now (March or April — before the summer rush). Change your air filter monthly during summer. Cost: $75 to $150 per year. Potential savings: $15 to $40 per month.
Air sealing: weatherstripping, caulking, attic hatch. Mostly DIY, under $150 in materials. Potential savings: $20 to $50 per month.
Solar screens on west and south-facing windows. Relatively inexpensive, high impact on afternoon heat gain. Potential savings: $15 to $35 per month.
HVAC replacement if your system is 12 to 15 years old and struggling. Apply for Oncor rebates (up to $600 per unit for SEER2 16+) and stack with manufacturer promotions. Potential savings: $50 to $100 per month compared to an old inefficient system.

The single most important thing to understand about energy efficiency in North Texas is that the problem is different here. The attic matters more than it does anywhere else. The AC running season is twice as long as most of the country. And your electricity rate is negotiable in a way most states don't allow.

Work through this list in order. The money on the table at the top of that list is easier to capture and faster to pay back than anything at the bottom. And if you're buying or selling a home in DFW and want to understand how energy efficiency features affect the real estate conversation — what buyers are asking for, what appraisers are recognizing, and what's actually worth negotiating on at closing — reach out to us at OnDemand Realty.