How to Protect Your Pool During a Texas Freeze

The 2021 freeze destroyed more pool equipment in Texas than any single event in the state's history. Pipes burst. Pump housings cracked. Filter tanks split open. Heaters were ruined. Homeowners who'd never dealt with frozen pool equipment were facing $2,000 to $10,000 repair bills — and every pool technician in North DFW was booked for months.

The worst part: almost all of that damage was preventable. The homeowners whose pools survived did one thing — they kept their pumps running. That's it. Moving water doesn't freeze. The concept is that simple. The execution requires a plan.

Texas freezes don't follow a schedule. Some winters barely touch 32°F. Others drop into the teens with ice storms that knock out power for days. You can't predict when it'll happen, but you can prepare so that when it does, your pool equipment survives intact.

Why Freezes Damage Pool Equipment

Water expands approximately 9% when it freezes. Your pool plumbing system — PVC pipes, pump housing, filter tank, heater, chlorinator, valves — is rigid. It cannot accommodate that 9% expansion. When water inside these components freezes, the ice pushes outward against the walls of the pipe or equipment until something cracks.

The damage often isn't visible immediately. A hairline crack in a buried PVC pipe won't show itself until the ice melts and water starts seeping into the ground. A pump housing crack might not leak until the pump runs and builds pressure. This is why freeze damage often doesn't get discovered until weeks later when homeowners notice dropping water levels or soggy spots in the yard.

The components most vulnerable to freeze damage, in order of risk:

Exposed plumbing at the equipment pad — pipes coming out of the ground and connecting to the pump, filter, and heater have no insulation and are fully exposed to air temperature.
Pump housing — the pump's volute (the spiral-shaped housing that holds water) is a single piece of molded plastic. One crack and it needs full replacement.
Filter tank — especially multiport valves on sand filters, which have thin walls and internal passages that trap water.
Heater — internal copper heat exchangers are expensive to replace and freeze easily if water isn't circulating through them.
Above-ground plumbing — any pipe running above ground between equipment is at highest risk.
Buried plumbing near the surface — pipes buried less than 18 inches deep can freeze in prolonged hard freezes, especially in North DFW's clay soil which conducts cold effectively.

The Single Most Important Rule: Keep Water Moving

Moving water resists freezing. A garden hose with water flowing through it won't freeze at 28°F. The same principle applies to your pool plumbing. As long as the pump is running and water is circulating through the entire system, the moving water carries enough thermal energy from the pool (which is much warmer than the air) to prevent ice formation in the pipes and equipment.

Run your pump continuously — 24 hours a day — whenever air temperature drops below 35°F. Don't wait until it hits 32°F. Pipes and equipment cool down faster than you'd expect, and water sitting in an exposed pipe can freeze before the air temperature technically hits freezing.

Keep the pump running until temperatures rise back above 40°F and stay there. A few dollars in electricity beats thousands in repairs.

If You Have Automation: Set Up Freeze Protection

Most modern pool automation systems (Pentair IntelliCenter/EasyTouch, Hayward OmniLogic/AquaRite, Jandy iAquaLink) have built-in freeze protection. When an air temperature sensor detects temperatures approaching freezing, the system automatically turns on the pump and keeps it running.

Critical checks before freeze season:

Verify the air temperature sensor is working. This small sensor is usually mounted on the equipment pad or attached to the automation panel. If it's failed, unplugged, or reading incorrectly, freeze protection won't activate. Test it by comparing its reading to your phone's weather app on a cold morning.
Set the freeze protection threshold to 38°F, not 32°F. Give yourself a buffer. Water in exposed pipes can freeze before air temperature officially hits 32°F due to wind chill and radiative cooling.
Make sure freeze protection activates ALL equipment. Some systems only turn on the main pump by default. Verify that the spa pump (if separate), water features, and heater circulation are also included in the freeze protection program.
Test it. On a cold night in November, verify that the system actually kicks on. Don't discover that freeze protection isn't working during the first real freeze.

If You Don't Have Automation: Manual Freeze Plan

Many older pools in North DFW — especially in Allen, Murphy, and established Plano neighborhoods — use simple timers without freeze protection. You'll need to manage this manually.

Set phone alarms. When weather forecasts show temperatures dropping below 35°F overnight, set an alarm to turn on your pump before the temperature drops. Turn it off when morning temperatures climb back above 40°F.

Consider a freeze guard device. Aftermarket freeze guards ($50 to $150) plug into your timer system and override the schedule to run the pump when temperatures drop. This is the cheapest way to add automatic freeze protection without a full automation upgrade.

Know your equipment pad. Walk out and identify every piece of equipment that holds water. Every valve, every pipe, the pump, the filter, the heater. When preparing for a freeze, water needs to be moving through ALL of them.

Extended Freeze Events: When Power Goes Out

The 2021 freeze taught Texas a brutal lesson — freeze protection only works if you have electricity. When the grid fails and your pump can't run, you need a backup plan.

Drain Vulnerable Equipment

If you know power will be out during a hard freeze, drain as much water as possible from exposed plumbing and equipment:

Open drain plugs on the pump (there are typically two — one on the strainer housing, one on the volute)
Open the drain plug on the filter
Open the drain on the heater
Open air relief valves on the filter tank
Open any winterization drain plugs on the plumbing

The goal is to get water OUT of rigid equipment so there's nothing to freeze and expand. Your buried underground plumbing and the pool itself are at lower risk — the ground insulates buried pipes, and the large volume of pool water takes much longer to freeze than water in a small pipe.

Insulate Exposed Equipment

If draining isn't practical, insulate everything you can:

Wrap exposed pipes with pipe insulation foam (available at any hardware store, $3 to $5 per 6-foot section)
Cover the pump and filter with moving blankets or heavy towels
Stuff insulation material around valves and fittings
Place a trouble light or heat lamp near the equipment pad (incandescent bulbs generate enough heat to keep a small enclosed area above freezing) — but be extremely careful about fire risk and keep away from flammable materials

Use a Generator

If you have a portable generator, your pool pump should be one of the circuits you power during an extended outage in freezing conditions. A typical pool pump draws 1,500 to 2,500 watts — most portable generators handle this easily.

After the Freeze: Inspection Checklist

Once temperatures recover, don't just turn the pump on and walk away. Inspect everything first.

Before turning the pump on:

Close any drain plugs you opened
Visually inspect the pump housing for cracks — look for hairline fractures around the lid area and the base
Check the filter tank for cracks, especially around the multiport valve
Look at all visible pipe joints and unions for separation or cracking
Check the heater for any visible damage
Inspect the pressure gauge — freeze damage can break gauges

After turning the pump on:

Watch for leaks at every joint, fitting, and equipment connection
Monitor pump pressure — abnormally low pressure may indicate a cracked suction pipe underground
Listen for air in the system — excessive air bubbles from return jets suggest a cracked pipe pulling air
Check for wet spots in the yard between the pool and equipment pad — this indicates an underground pipe crack
Run the system for at least 30 minutes while observing before leaving it unattended

Within the first week:

Monitor water level daily. If the pool is losing water faster than normal evaporation, you likely have a freeze-damaged pipe leaking underground
Test water chemistry and rebalance — stagnant water during a freeze event can shift chemistry significantly
Clean the filter — debris and settled particles from non-circulation during the freeze need to be flushed out

The Cost of Freeze Damage vs. Prevention

Prevention	Cost
Running pump 24/7 for 3 days	$5 – $15 electricity
Aftermarket freeze guard device	$50 – $150 (one-time)
Pipe insulation	$15 – $30 (one-time)
Professional winterization service	$200 – $400
Total prevention cost	$70 – $595

Common freeze damage repairs	Cost
Pump housing replacement	$200 – $500
Full pump replacement	$800 – $2,000
Filter multiport valve replacement	$200 – $400
Cracked underground pipe repair	$500 – $2,000
Heater heat exchanger replacement	$800 – $2,500
Multiple component damage (common)	$2,000 – $7,000
Average freeze damage repair bill	$1,500 – $5,000

The math isn't subtle. Prevention costs 1 to 10% of what repair costs.

Freeze Preparation Timeline for North DFW

October: Inspect and test freeze protection systems. Replace the air temperature sensor battery if applicable. Buy pipe insulation and have it ready. Know where your equipment drain plugs are.

November: Set freeze protection threshold to 38°F. Test the system on the first cold night. Verify all equipment is included in the freeze protection program. If you don't have automation, buy a freeze guard or set up your manual plan.

December – February: Monitor weather forecasts actively. Run pump continuously whenever air temperature approaches 35°F. Keep insulation materials accessible. If extended freeze with power outage is forecast, drain equipment proactively.

March: Final inspection for any latent freeze damage from the winter season before spring startup.

Want freeze protection set up before winter? Hydra Pool Services provides freeze preparation, equipment winterization, and year-round maintenance across Frisco, Plano, McKinney, Allen, Murphy, and The Colony. Don't learn this lesson the expensive way. Schedule freeze prep →