In most of Texas, heating demand doesn’t really show up until November, and it fades by April. That’s based on Houston’s 30-year climate normals, the benchmark for this guide. Winter here is short and mild compared to much of the country, but it isn’t nothing. The month you flip the switch depends less on a calendar date and more on when your house actually feels cold enough to need it.
When the heating season starts in Texas
Climatologists don’t guess at this. NOAA tracks a “base” temperature of 65°F, the point below which a typical home needs supplemental heat to stay comfortable. At the Houston Intercontinental Airport reference station, the 30-year normal mean temperature drops below that line in November, which is why heating degree days start accumulating that month. January is the coldest month on the normals, with 366 degree days, and by April the mean climbs back above 65°F, closing out a heating season that runs roughly five months.
That’s an average, not a forecast for any particular week. A monthly normal is built from three decades of data, so the first real cold snap of any given year almost always arrives before the “normal” month suggests it should. Treat November as the month to be ready, not the day to expect frost.
The shape of the season matters as much as its length, and that’s where the monthly breakdown earns its keep. Notice how the table below has no entries for June through September: those months carry zero heating degree days at this station, because the average temperature never dips near the 65°F threshold. Heating in Texas has nothing to do during a Houston summer.
| Month | Heating Degree Days |
|---|---|
| January | 366 |
| February | 236 |
| March | 122 |
| April | 31 |
| May | 1 |
| October | 26 |
| November | 158 |
| December | 325 |
Read it as a season, not a scoreboard. The numbers rise from October, peak around midwinter, and drop back off by spring, and that pattern is what a Texas heating bill actually tracks month by month.
How hard the winter works here
Add up every day of the year at this station and you get about 1,266 heating degree days, a figure that turns climate into something closer to a fuel bill. Degree days are a rough proxy for how much a furnace or heat pump has to work: a house with twice the heating degree days of another, all else equal, burns roughly twice the fuel to stay just as warm.
For context inside the same measuring system, that annual number is modest. It reflects a heating season that’s short rather than one that’s brutal for months on end. The monthly table above is what actually tells that story, since two places can post the same annual total in very different ways, one with a long stretch of gentle chill, another with a short, sharp cold snap that does all the damage in a few weeks.
Worth noting that the same station logs about 3,288 cooling degree days a year, more than double its heating total. That’s the real character of a Texas home’s mechanical system: the air conditioner is the workhorse, and heat is the seasonal guest. Anyone budgeting for a furnace repair here is dealing with a system that runs for a handful of months and then sits idle, which changes how you think about maintenance timing and how much wear a system typically accumulates before it needs attention.
What most homes in Texas actually heat with
Federal survey data on home energy use shows a clear pattern for how Texas houses are actually equipped, not how an engineer might design them today.
| System or fuel | Share of homes |
|---|---|
| Furnace | 61% |
| Central heat pump | 19% |
| Steam or hot-water boiler | estimate suppressed, not reported |
| Natural gas | 42% |
| Electricity | 51% |
| Fuel oil or kerosene | none reported |
| Propane | 2% |
A couple of those entries need translation. “None reported” for fuel oil doesn’t mean zero Texas homes burn it, it means the survey sample found too few to publish a reliable number. “Not reported” for boilers is a different gap: the estimate existed but was judged too shaky to print. Neither is a count of zero, and it would be wrong to write it that way.
The furnace’s dominance, paired with electricity edging out natural gas as the leading fuel, tells you what got built when Texas subdivisions went up, not what’s necessarily right for a given house today. A furnace share this high, split across gas and electric resistance units, reflects decades of cheap electricity and abundant natural gas more than it reflects any judgment about performance. It is not a recommendation, just a record of what got installed.
In practice, a furnace-heavy state means the maintenance item that matters most is the one people skip: the air filter. A clogged filter starves airflow, forces the blower to work harder, and on an electric furnace or heat pump that translates directly into a higher bill. Furnaces also move heat fast and recover quickly after a cold snap, which suits Texas’s short season, but they can leave a house feeling drafty compared to radiant systems more common up north, since forced air cools down the moment the burner or element shuts off.
Run it once before you need it
Every heating call center in Texas fills up on the same night, the first genuinely cold one of the year, and that’s exactly when you don’t want to discover your furnace won’t start. The fix is running the system in November, weeks before you need it, so a problem shows up while there’s still time to book a technician who isn’t already three weeks out.
- Set the Thermostat a few degrees above room temperature and let the system run for five or ten minutes. Listen for anything that sounds like grinding, rattling, or a delayed startup, since those are the cheapest problems to catch early.
- Expect a faint burnt-dust smell the first time the system fires after months of sitting idle. That’s dust burning off the heat exchanger or elements, and it should fade within an hour. A smell that lingers or smells more like plastic or gas is not normal.
- Replace or clean the filter before that first run. A dirty filter restricts airflow across the whole system, and it’s the single most common reason a furnace underperforms or trips a safety switch.
- Clear the space around vents, returns, radiators, or an outdoor heat pump unit. Furniture, boxes, and yard debris blocking airflow force the system to work harder for less heat delivered to the room.
- Test the carbon monoxide alarm before you rely on the system overnight. Fuel-burning furnaces produce carbon monoxide as a byproduct, and a working alarm is the cheapest insurance in the house.
- Call a professional if you notice a burning smell that doesn’t fade, a system that won’t stay on, or any carbon monoxide alarm activation. Those aren’t do-it-yourself situations.
Even a system in perfect working order can quietly waste heat before it ever reaches a room. According to the U.S. Department of Energy, “in a typical house, about 20%-30% of the air that moves through the duct system is lost due to leaks, holes, and poorly connected ducts.” That’s not a measure of how much heat the whole house loses, it’s specifically about the air moving through the ducts themselves, and it’s a national average, not a guarantee about any one house. Still, it explains a lot of the rooms that never quite warm up no matter how long the furnace runs.
What turning it down is actually worth
The Department of Energy puts a real number on the payoff for using a Thermostat setback, and it’s worth quoting exactly rather than rounding it into something simpler. “You can save as much as 10% a year on heating and cooling by simply turning your thermostat back 7-10°F for 8 hours a day from its normal setting.”
That figure covers a full year of heating and cooling together, not a single winter and not a per-degree formula. In a state where the heating season runs about five months and the cooling season runs longer still, a consistent setback schedule has plenty of hours to work with on both ends, whether that’s a colder house overnight in December or a warmer one during a weekday in August. The habit pays off across the calendar, not just during the months this page is about.