Austin does not really do winter. Not the way Chicago does, anyway. But ask anyone who owns a pool here and they’ll tell you the same thing: that water gets cold a lot sooner than you expect, and it stays cold through stretches of the year when the air outside feels perfectly fine.
That gap is the whole reason a pool heater exists. You built a beautiful pool. A heater is what lets you actually use it in March, in late October, on those crisp Hill Country evenings when the deck is warm and the water is, frankly, not. So let’s talk through what a pool heater does, the three main types, and how to think about running costs before you commit.
What a pool heater actually does
Simple version. A pool heater pulls water from the pool, raises its temperature as it passes through, and sends it back. Run it long enough and the whole pool climbs to whatever you set.
What it does for you is less about the machine and more about the calendar. A standard Austin swim season runs maybe May through September if you leave it to nature. Add a heater and you can stretch that on both ends, comfortably reaching into spring and fall, and on milder winters you can dip in whenever the mood hits. People with a spa attached to the pool lean on the heater almost year-round, because a hot spa in January is one of the genuine pleasures of Texas living.
The three types of pool heater, and which fits Austin
Not all heaters work the same way, and the right pick depends on how you plan to use the pool.
Gas heaters
Gas heaters burn natural gas or propane to heat the water, and they are the speed champions. You can take a cold pool and have it swimmable in a few hours, regardless of what the weather is doing outside.
That makes gas the right call for anyone who heats on demand. You host on weekends, you want the pool warm Saturday morning, you shut it down Sunday night. Gas does not care if it is 45 degrees and windy. The tradeoff is operating cost. Natural gas prices move around, and if you run a gas heater constantly, the bill gets your attention fast.
Electric heat pumps
A heat pump does not generate heat so much as move it. It pulls warmth out of the surrounding air and transfers it into the water. Because of that, it is dramatically more efficient than gas, often several times more for every dollar spent.
For most Austin homeowners, a heat pump is the sweet spot. Our climate actually plays to its strengths, since heat pumps work best when the outside air is mild, and “mild” describes a huge chunk of our year. The catch is speed. A heat pump heats gradually, so it suits people who like to keep the pool at a steady temperature rather than firing it up from cold the night before a party. If energy-efficient pool systems are a priority for you, and for a lot of our clients they very much are, this is usually the conversation we start with. ENERGY STAR keeps a useful rundown of efficient pool equipment over at energystar.gov if you want to compare models.
Solar heating
Solar systems route pool water through panels, usually roof-mounted, where the Texas sun does the work for free. Once installed, the running cost is close to nothing.
Austin has the sunshine to make solar genuinely viable. The honest drawbacks are two. It needs adequate, well-oriented roof space, and it only heats when the sun cooperates, so output drops on cloudy days and after dark. Plenty of homeowners in Lakeway and Bee Cave run solar as the main system and keep a small gas or heat pump unit as backup for the gloomy stretches. Best of both, if the budget allows.
Why a heater matters more here than you’d guess
This is where Austin owners often get surprised.
We get real cold snaps. Not many, but they arrive, and our overnight temperatures swing hard even in the so-called warm months. A pool can lose a startling amount of heat overnight, especially on a breezy Hill Country lot where there is nothing to block the wind. You can have an 88-degree afternoon and water that feels like a lake by sunrise.
Then there is the shoulder season problem. April and October are some of the most pleasant months of the entire year in Central Texas. The air is great. The pool is unused, because without a heater it is just a touch too cold to be fun. A heater quietly buys back those months, and they are often the months you most want to be outside anyway, before the August furnace or after it.
A cover helps too, since it traps heat and cuts evaporation, and pairing a cover with a heater is the single most efficient way to run the whole setup. We bring that up with nearly every client.
Sizing and running costs
A heater that is too small will run forever and never quite get there. One sized correctly does its job and rests.
Sizing depends on a handful of things: the surface area of your pool, the temperature you want to hold, how exposed the pool is to wind, and whether you use a cover. This is not a guess-and-hope situation, and it is genuinely worth having a professional run the numbers for your specific backyard. A pool tucked behind a Westlake privacy wall has very different needs than an open lot out in Dripping Springs.
On cost, think in two buckets. There is the upfront equipment and installation, and there is the month-to-month energy use. Gas tends to be cheaper to install and pricier to run. Heat pumps cost more at install and far less to operate over the years, which is why they so often win on total cost once you do the long math. Because that upfront number is real, many homeowners fold the heater into their overall pool budget, and Longhorn Pools offers financing options that make it easier to do the project right the first time instead of retrofitting later.
A real-world scenario
Consider a family in Cedar Park with a mid-sized inground pool. (Illustrative, not a specific customer, though the pattern is common.)
They swam all summer, loved it, and then noticed the pool sat dead from October clear through April. Six months of a beautiful feature nobody touched. They added a properly sized heat pump and paired it with an automatic cover. The result was not “year-round swimming in shorts.” It was better than that, honestly: comfortable spring and fall swims, a warm spa on cold nights, and a pool that finally felt like it earned its place in the yard instead of hibernating half the year.
That is the realistic win. Not magic. Just more of the thing you paid for.
How Longhorn Pools builds heating into the plan
The smartest time to think about a heater is before the pool is built, not two years after.
When heating is part of the original design, we can size the equipment pad correctly, run the gas line or electrical capacity you’ll need, and position everything so it runs efficiently and stays easy to service. Retrofitting a heater onto a finished pool is absolutely doable, and we do it often, but planning it in from day one is cleaner and usually cheaper.
If you are still in the early stages, our residential pool services cover the full build, heating included, and our inground pool installation guide walks through how the pieces come together. Already have a pool and just want to extend your season? We can help there too.
Want to figure out which heater actually fits your backyard and how you swim? Get in touch for a consultation. We’ll look at your pool, your lot, and your habits, and point you to the system that gets you the most swim days for your money.