Howdy, Southlake neighbors!
Your local comfort crew from Christmas Air is back, and this month, we want to settle something that drives North Texas homeowners crazy every single summer.
You set the thermostat to 74. The thermostat confirms it hit 74. But you’re still sweating on the couch, the kids are complaining, and everyone in the house is convinced the AC is broken.
Here’s the thing: your AC probably isn’t broken. Your thermostat probably isn’t lying. But something in your home is creating a gap between what the number says and what your body feels. Until you understand what that is, you’ll keep cranking the temperature down, running your system harder, and paying more on your electric bill—without ever actually getting comfortable.
The Real Culprit: Humidity
Temperature and comfort are not the same thing. Your body cools itself by sweating—moisture evaporates from your skin, carrying heat away. When the air inside your home is humid, evaporation slows. The air is already carrying as much moisture as it can handle, so your sweat sits there. You feel hot and sticky even if the thermometer says otherwise.
In a DFW June, outdoor humidity regularly runs 60 to 70 percent. Every time a door opens, every shower, every pot of boiling water adds more moisture to your indoor air. Your AC removes humidity as a byproduct of cooling—but only when it runs long enough to do so.
This is where short cycling becomes a real problem.
Short Cycling: When Your AC Cools Without Comforting
Short cycling is when your AC reaches the target temperature quickly, then shuts off and kicks back on a few minutes later. It keeps the house at the right temperature, but never runs long enough to pull meaningful humidity out of the air.
The most common cause in Southlake homes is an oversized system. Bigger is not always better with AC. A unit that’s too large for your square footage cools the air so fast it never completes a proper dehumidification cycle. The house hits 74 in ten minutes, the system shuts off, and you’re left sitting in 74-degree air that feels like a greenhouse.
Other causes include a poorly placed thermostat—near a vent, in direct sun, or in a room that cools faster than the rest of the house. The thermostat reads satisfied and shuts off the system while the rest of your home remains uncomfortable.
What 74 Actually Feels Like at Different Humidity Levels
At 40 percent indoor humidity, 74 degrees feels like 74 degrees. Cool, comfortable, exactly what you set.
At 55 percent indoor humidity, 74 degrees feels closer to 78. You’re not imagining it.
At 65 percent indoor humidity, 74 degrees feels like 80 or above. You turn it down to 70. Your bill goes up. You’re still uncomfortable. The fix isn’t a lower thermostat setting—it’s getting the humidity under control.
What You Can Actually Do About It
If your system is short-cycling, a diagnostic visit will tell you whether the issue is a sizing or thermostat placement issue, or something else with the equipment. This is not a problem you can dial your way out of.
If the system is running properly but humidity is still high, a whole-home dehumidifier is worth a serious conversation. These units install directly into your HVAC system and pull moisture out of the air independently of the cooling cycle. You can set a target humidity level—most people find 45 to 50 percent ideal—and the system maintains it automatically. The result is that 74 actually feels like 74.
For most Southlake homeowners dealing with this problem, the investment pays off in two ways: a lower thermostat setting means lower electric bills, and reduced humidity protects your home from mold and wood damage that quietly builds up in overly moist air.
Call or text Christmas Air at 972-332-5679 or visit ChristmasAir.com. If your house never quite feels comfortable, no matter what the thermostat says, we can tell you exactly why in one visit—serving Southlake, Trophy Club, Flower Mound, and the surrounding area. We’re here to “Change lives through the trades. Create smiles. Do it every day”—and that certainly includes helping you stay cool and comfortable, even when Texas turns up the heat!
