A heat advisory covering North Texas is keeping feels-like temperatures at 109°F, according to a CBS News report this week. That number isn't a curiosity. At 109 degrees of apparent heat, the human body's ability to shed heat through sweating starts to lose the race, especially for anyone older than 65, younger than five, on certain blood pressure medications, or working outside.

The advisory itself is not the story. North Texas summers have always been brutal. The story is what 109 feels-like degrees reveals about household fragility — specifically, the gap between "I have central air" and "I have a plan."

What's actually changing

ERCOT, the grid operator managing roughly 90 percent of Texas's electricity, has expanded its capacity buffer since the February 2021 freeze, but summer demand peaks are now arriving earlier in the season and lasting longer. When feels-like temperatures stay above 105°F across a multi-county region for consecutive days, grid stress accumulates. Rolling conservation appeals have happened in recent summers, and they can happen again with little notice.

The second change is medication vulnerability. A growing share of Texas households include someone on a drug that impairs heat tolerance: diuretics, beta-blockers, antipsychotics, and antihistamines all affect either sweat production or circulation. Most families don't know this about their own medicine cabinet until someone collapses.

The third change is home construction. North Texas added millions of square feet of housing stock quickly over the past decade. Many newer homes in the DFW suburbs have adequate HVAC on paper but inadequate attic insulation, western-facing windows with no external shade, and ductwork in unconditioned attic space. When outdoor temperature stays high overnight — above 80°F — these homes stop recovering. By morning, indoor temps that should have dropped to 74°F are sitting at 80°F, and the HVAC never fully catches up the next day.

What we'd actually do

Identify your household's medical heat risk this week. Pull out every prescription bottle in the house and look up each drug's heat-sensitivity profile on the FDA's drug label database or your pharmacist's printed insert. One phone call to your pharmacy is free. You may discover that a family member's "summer fatigue" has a pharmacological cause — and that the fix is as simple as adjusting activity timing or increasing fluid intake in a structured way your doctor approves.

Create a written cooling plan before the next advisory hits. A cooling plan is a one-page document, not a binder. It lists your nearest public cooling center (Dallas County, Tarrant County, Collin County, and Denton County all maintain updated lists through their OEM websites), your household's internal threshold for leaving ("if indoor temp reaches X°F for more than Y hours, we go"), and a contact name for any neighbor over 70 on your street. Write it down. Put it on the fridge. People don't make good decisions at 109 degrees of apparent heat.

Test your HVAC system's actual overnight recovery. On a day when the forecast low drops below 80°F, set your thermostat to 72°F before bed and check your indoor temperature at 6 a.m. without opening doors. If the gap is more than 3 degrees off target, your system is underperforming — possibly from a dirty filter, low refrigerant, or duct leakage into the attic. A $15 filter change resolves the first cause. The others need a technician, but knowing you have the problem is the first step.

Build a 72-hour no-grid cooling kit for one room. Pick the room with the fewest exterior walls, lowest window exposure, and least heat gain — usually an interior bedroom or bathroom. A battery-powered fan, a cooler with a frozen two-liter bottle, blackout curtains, and a reflective window film panel can drop the apparent temperature in a small room by 10 to 15 degrees. None of this costs more than $60 at a hardware store. This is not a substitute for a real cooling center; it's a buffer while you decide whether you need one.

Register vulnerable household members with your county's emergency registry. Most Texas counties operate a Special Needs Registry through their Office of Emergency Management — it flags your address for priority welfare checks during declared emergencies. It takes about five minutes online and costs nothing.

The bigger picture

A 109-degree heat index in North Texas in late July is not a signal that civilization is ending. It is a signal that Texas summers require a level of household preparation most families give to hurricanes but not to heat — even though heat kills more Americans annually than any other weather event. The goal isn't a bunker. It's knowing which room stays coolest, which neighbor is most at risk, and what your HVAC is actually doing overnight. Those three things cost almost nothing and take less than a weekend to sort out.

Durability is built in ordinary moments before the advisory arrives.