Texas homes cool almost entirely with central air conditioning, and the number that matters most is the gap between “has AC” and “has a central system” — a gap filled by window units, mini-splits, and portables. Ceiling fans round out the picture in nearly every house, working alongside whatever cooling equipment is already installed.
What homes in Texas actually cool with
According to the U.S. Energy Information Administration’s 2020 Residential Energy Consumption Survey, 95% of Texas homes use some form of air-conditioning equipment. Of those, 83% run on a central air-conditioning unit, while 16% rely on an individual unit — a ductless mini-split, a window or wall unit, or a portable. Ceiling fans show up in 88% of homes, doing quiet backup duty whether the house has central air or not.
That 16% figure is the gap itself, and in some states it tells the whole story. Connecticut, for instance, reports 90% of homes with air conditioning but only 34% on central equipment — meaning most of that state’s cooling runs through window units and mini-splits. Alabama sits at 94% with AC and 81% central, a mix much closer to what Texas shows. Texas leans hard toward central systems, which tracks with a housing stock built with ducted cooling in mind from the start rather than retrofitted room by room.
None of these shares are a recommendation. They reflect what was affordable and available when each house went up, not what a homeowner should install today. A share is a snapshot of installed equipment, not a verdict on what works best. And where a state’s figure is published as “Q,” that means the sample size was too small to report — not that zero households use that equipment. Texas doesn’t carry a Q in either category here, so the 83% and 16% stand as reported.
How much cooling the year actually asks for
NOAA’s Climate Normals for 1991-2020, measured at the Houston reference station, put the mean number of days reaching 90 degrees Fahrenheit or higher at 102.4 days a year. That’s a count of days, not an average temperature and not a statewide reading — it’s what one weather station logs in a typical year, and it stands in for the heat load a cooling system has to handle season after season.
Here’s where it gets useful: equipment mix and heat load don’t always line up. A state can rack up plenty of 90-degree days and still lean on window units, because the housing stock predates ductwork or never got retrofitted. Or a milder state can be almost entirely central simply because its homes were built more recently, when ducted systems were standard.
Texas is a case where the two figures agree. More than 100 days a year above 90 degrees, paired with 83% of homes on central air, is a housing stock built to answer sustained heat with sustained, whole-house cooling rather than room-by-room patchwork. The 16% running on individual units likely covers additions, garage apartments, and older units where running new ductwork never made sense.
Wet heat or dry heat, and what it changes
NOAA’s monthly normals for the same reference station put summer rainfall at about 14.6 inches across June, July and August, out of 51.8 inches for the year. June brings roughly 6.0 inches, July drops to the driest point at 3.77, and August climbs back to 4.84. That’s a measure of precipitation, not humidity or dew point — but 14.6 inches over three months is a wet summer by any plain reading, and it means an air conditioner here is doing real work beyond just lowering the thermostat number.
An air conditioner does two jobs at once: it drops temperature and it pulls moisture out of the air. Removing that moisture takes run time. In a dry climate, the machine’s job is almost all temperature, and it can cycle off quickly once the room feels cool. In a wet one, a good chunk of the workload is dehumidifying, and a unit that shuts off too fast leaves a house cold on the thermostat but clammy on the skin. That’s exactly what happens with an oversized unit — it satisfies the temperature setting almost immediately and never runs long enough to dry the air.
Given a wet summer like this one, three things matter more than usual:
- Let the system run longer cycles rather than short bursts — resist the urge to crank the thermostat lower to “speed things up.”
- Use the fan setting on “auto” rather than “on,” so moisture collected on the coil drains away instead of blowing back into the room between cycles.
- Size equipment to the space rather than rounding up “to be safe,” since oversizing is the direct cause of the cold-and-clammy problem in a humid summer like this.
Sizing a room unit, from the published chart
ENERGY STAR publishes a cooling capacity chart for room air conditioners, matched to square footage:
| Area to be cooled (sq ft) | Capacity needed (BTU/hour) |
|---|---|
| 100 up to 150 | 5,000 |
| 150 up to 250 | 6,000 |
| 250 up to 300 | 7,000 |
| 300 up to 350 | 8,000 |
| 350 up to 400 | 9,000 |
| 400 up to 450 | 10,000 |
| 450 up to 550 | 12,000 |
| 550 up to 700 | 14,000 |
| 700 up to 1,000 | 18,000 |
| 1,000 up to 1,200 | 21,000 |
| 1,200 up to 1,400 | 23,000 |
This chart is a starting point for a single room unit, published by ENERGY STAR — it does not size a central system, which requires a proper load calculation that accounts for insulation, window area, and duct layout. In a state where 83% of homes run central air, that distinction matters: the chart above is the wrong tool for the whole-house system most Texas homes already have.
Where it does matter is the 16% of Texas homes running individual equipment — the window unit in a converted garage, the mini-split in an add-on room, the portable brought in for a home office. For those situations, this table is the right reference, and the same caution applies: bigger isn’t safer. An oversized room unit cools the air fast, shuts off, and never runs long enough to pull the humidity out of a Texas summer.
What actually needs looking after here
With central air running most Texas homes, duct condition deserves attention before anything else. ENERGY STAR notes that “in a typical house, however, about 20 to 30 percent of the air that moves through the duct system is lost due to leaks, holes, and poorly connected ducts.” That applies to the 83% of homes on central systems here — a house cooled entirely by window units has no ducts to lose air through, so this caution is specifically for ducted equipment.
Beyond the ducts, ENERGY STAR is direct about the single cheapest fix available: “Inspect, clean, or change air filters once a month in your central air conditioner, furnace, and/or heat pump.” That instruction covers all three types of equipment together, which matters for anyone assuming filter care is only a furnace chore. ENERGY STAR also points out why a clean filter matters even when everything else seems fine: “Airflow problems can reduce your system’s efficiency by up to 15 percent.”
A seasonal pass built around what Texas homes actually run looks like this:
- Check or replace the filter monthly through the cooling season, on both central systems and any mini-split or window unit running in an add-on room.
- Have ductwork inspected for leaks before peak summer, given how much conditioned air a typical duct system loses before it reaches a vent.
- Clear the outdoor condenser unit of debris and confirm ceiling fans are set to spin counterclockwise for a cooling breeze.
For equipment-specific detail, the central air conditioning maintenance guide and the ductless mini-split guide on this site’s cooling and heating hub go deeper into each piece of that list.