Here in DFW, we get a question pretty regularly that goes something like this: “My AC is running fine, but the house just feels sticky. What’s wrong with it?”
Nine times out of ten, nothing is actually wrong with the equipment. The problem is that the equipment is too big for the house.
I know that sounds backwards. Bigger should be better, right? Not with air conditioning.
What Short-Cycling Actually Is
When an AC system is oversized for a home, it cools the air temperature down so fast that it shuts off before it’s had a chance to run a full cycle. In the HVAC world we call this short-cycling — the system kicks on, blasts cold air for 8 or 10 minutes, hits the thermostat setpoint, and shuts back off.
Your thermostat says 74°F. You believe it. But you still feel like you’re living in a greenhouse.
That’s because removing heat and removing humidity are two different jobs. Your AC does both — but only if it runs long enough. Short cycles cool the air fast but barely touch the moisture. So you end up with a house that’s technically at the right temperature but feels 10 degrees warmer than it should because the humidity is sitting at 60%, 65%, sometimes higher.
How Common Is This in DFW?
In our experience working in homes across Garland, Rowlett, Sachse, and Mesquite — roughly half the systems we look at are oversized for the home they’re in. That’s not a small problem. That’s the norm.
A lot of it traces back to how systems have been sized around here for decades. Square footage alone was the measuring stick. Bigger number, bigger unit. Nobody was accounting for insulation levels, window orientation, ceiling height, or the fact that a west-facing living room in Texas absorbs heat all afternoon like a brick oven.
The Other Thing Short-Cycling Does to You
Beyond the humidity, short-cycling is expensive. Your AC draws the most electricity in the first few seconds of startup — the compressor surge. A system that starts and stops 15 times an hour instead of running 3 steady cycles is burning significantly more power than it should. Those high summer energy bills you’ve been blaming on the Texas heat? Some of that is just an oversized system starting and stopping all day long.
What You Can Do About It
If your house feels sticky even when the AC is “working,” the first thing worth doing is getting a proper load calculation — a Manual J — done on your home. This is the actual engineering method for determining what size system your house needs based on how it’s built, not just how big it is.
We offer a Precision HVAC Sizing Scan that uses LiDAR technology to do exactly that. If your system turns out to be oversized, you’ll at least know what you’re dealing with — and you can make a smart decision about whether to live with it, adjust it, or replace it when the time comes.
Either way, you deserve to know the truth about your system. That’s kind of the whole reason we do what we do.
Expedition Heating & Air is a licensed HVAC contractor serving Garland, TX and the Dallas–Fort Worth metroplex. License TACLB112648E. Call 469-905-4822.
