A Plano pool gets through a Texas freeze on moving water, with the pump running nonstop and the valves open to every line. The exposed equipment freezes long before the pool water does, so the equipment is what you are protecting, and if the power fails the plan becomes draining the equipment, never the pool.
The plan has to hold for days, not hours. The National Weather Service in Fort Worth recorded 139 consecutive hours at or below freezing at DFW Airport in February 2021, from the evening of February 13 through midday on February 19. On February 15, its event summary notes, “DFW’s high temperature was lower than the record low for the date,” and the power failed across Texas partway through that week. That combination is why so much pool equipment cracked, and it is the case a freeze plan has to survive.
Why freezes crack pool equipment
Water expands when it freezes. When water sitting still inside your pump, filter, plumbing, or valves turns to ice, it pushes outward with enough force to crack a pump housing, split a filter, or burst a pipe. The pool itself, with thousands of gallons of relatively warm water, doesn’t freeze solid in our climate. The vulnerable parts are the small volumes of water in the exposed equipment above ground, where the cold air reaches them directly, and keeping that water moving is the whole strategy.
| Conditions | Risk level | What to do |
|---|---|---|
| High 30s F overnight | Low, but this is where your equipment starts protecting itself | Confirm any built-in freeze guard is enabled. Pentair automation engages near 36 F, Hayward defaults to 38 F |
| Brief dip slightly below 32 F overnight | Low to moderate | Run the pump overnight |
| Below freezing for 12+ hours | Moderate to high | Run the pump continuously, monitor |
| Hard freeze, low 20s or teens for a day or more | High | Run pump nonstop, check equipment, be ready to act |
| Hard freeze plus a power outage | Severe | Equipment is exposed; relieve pressure and seek help |
Before the freeze: get ready
North Texas usually gives you a day or two of warning before a hard front arrives. Use it.
- Confirm your pump will run continuously. If you run on a timer, set it to run 24 hours through the freeze event, or switch it to manual on. The pump shutting off in the middle of the night is the classic failure.
- Clear leaves and debris from the skimmer and pump baskets. Good flow matters more than ever when you’re relying on circulation.
- Make sure the water level is normal. Too low and the skimmer can suck air, which breaks circulation. Top off if needed before it gets cold.
- Enable any freeze-protection features. Many newer systems have a built-in freeze guard that kicks the pump on automatically when it gets cold. Know whether yours has one and that it is enabled.
- Set the valves so every line circulates. If you have a spa, waterfall, or spillover, running it during the freeze keeps water moving through those lines too. Any plumbing with still water in it is a candidate to freeze.
- Insulate exposed equipment if you can. Wrapping the pump and exposed pipes with towels, blankets, or pipe insulation buys you margin, especially if the power flickers.
A gas heater on the pad deserves separate attention. A heat exchanger full of still water that freezes is the single costliest failure on the pad, and unlike a pump housing it isn’t a modest part swap. Some heaters have their own internal freeze protection, but it depends on the unit having power like everything else here. Before a hard freeze, know where the heater drain plugs are. During an extended outage, they come out along with the pump and filter plugs.
The freeze guard problem most owners miss
Most homeowners assume a freeze guard means the pool is handled. It’s more limited than that, and what it does depends on which of three setups you have.
| Your setup | What happens when it gets cold | What you have to do |
|---|---|---|
| Mechanical time clock | Nothing. It runs the hours its pins are set to and stops | Set it to run continuously yourself, by hand, before the freeze |
| Automation panel with freeze protection | Overrides the schedule and runs the pump below its setpoint, near 36 F on Pentair, 38 F by default on Hayward | Confirm it is enabled and the setpoint is sane, then set your valves |
| Variable-speed pump with a freeze mode | Starts the pump at a preset speed, which may be lower than normal circulation | Check the programmed speed moves water through everything |
Four traps sit inside that table. The first is the biggest: freeze protection is a feature of powered equipment. It does nothing during an outage, which is the exact scenario that broke so much equipment in 2021.
The second is valve position. Freeze protection circulates water through whatever path your valves are currently set to. If a three-way valve is turned to pool only, the spa plumbing, the spillover line, and the waterfall feed all sit full of still water while the pump runs. Raised spas and sheer descents are usually the most exposed plumbing on the property, which makes this an expensive thing to get wrong.
The third is speed. A variable-speed pump in freeze mode runs at whatever RPM it was programmed to, and a low, energy-saving preset can satisfy the pump without keeping water moving through a long run of exposed pipe. If you have a variable-speed pump, find out what speed its freeze mode uses before you need it.
The fourth is where the sensor lives. Freeze protection triggers off an air temperature sensor, and a sensor mounted in a sheltered spot, in direct afternoon sun, or inside a warm equipment enclosure will read several degrees higher than the pipes it is meant to be protecting. That gap is why the manufacturers set their defaults in the high 30s rather than at 32 in the first place.
During the freeze: keep it moving
During a freeze, don’t turn the pump off. Let it run continuously, day and night, until temperatures climb back above 32 degrees and stay there. Check on the equipment periodically through the cold snap to confirm the pump is still running and water is still flowing. If you see flow stop, that’s the moment to act rather than wait.
A power outage is the real emergency
The dangerous scenario is a hard freeze combined with a power outage, exactly what happened across Texas in 2021. With no power, your pump stops, water goes still, and the equipment is exposed. If you can’t restore power quickly, relieve pressure: open the drain plugs on the pump, filter, and heater so expanding ice has somewhere to go instead of cracking the housing. Switch the pump breaker off too, so it doesn’t kick back on and run dry when power returns. If you aren’t sure how, call us, because we would rather walk you through it than see you replace a pump.
After the freeze: check for damage
Once any ice has thawed, walk the equipment before you assume everything is fine:
- Look for leaks around the pump, filter, valves, and visible plumbing. A hairline crack from freezing often shows up as a drip or a puddle once the system is running normally again.
- Check the pump basket and lid for cracks, and watch that the pump primes and holds pressure.
- Watch your water level over the next few days. A slow, unexplained drop can mean a freeze-cracked line.
- Listen and look for odd behavior from the equipment, such as new noises, low flow, or pressure that won’t build.
Catching a small freeze crack early can mean a simple part replacement instead of a flooded equipment pad and a larger repair bill. If the walk-around turns up something, our guide to freeze damage covers the restart sequence, what each repair runs around here, and the point at which to stop and call.
Plano pools don’t need winterizing
A Plano pool doesn’t need winterizing the way northern pools do. Our winters bring short freeze events rather than months of cold, so the pool stays full and running year-round and the equipment gets protected when a freeze comes through. Draining a pool in our expansive clay soil can do real harm, since an empty pool can shift or pop out of the ground.
What does help over winter is keeping up on basic chemistry and circulation at a reduced level, and running a pool through the winter covers the schedule, including why a salt pool makes no chlorine in a cold snap. A pool that goes into a freeze already balanced and clean comes out the other side in better shape. If you would rather not stand outside at midnight checking your pump in an ice storm, watching freeze events and setting systems up to ride them out is part of what a service plan does.
Going into a cold snap unsure about your setup?
If you aren’t confident your pump, timer, or freeze guard is ready for the next hard front, reach out. An equipment inspection ahead of time means you aren’t figuring it out at 11 PM when the temperature is dropping. Start with our contact form or give us a call.
