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—Heating and cooling

Keeping a pool cooler in summer

Cooling a pool is a mix of removing heat and stopping it getting in. The right combination depends on the pool and the budget.

Mechanical cooling with a chiller or combined heat and cool unit removes heat directly and can hold a set temperature. Passive measures reduce heat gain: shade over the water, reflective covers when the pool is not in use, and avoiding dark finishes in fully exposed pools. Evaporation from water features also cools slightly, at the cost of water loss.

Temperature guides explain how pools in a hot climate are heated in winter and cooled in summer.

Running circulation and cooling at night, when air is cooler, can improve efficiency for some units. Combining shade with a moderately sized cooling unit is often more effective than relying on either alone. The choice depends on how cool you want the water and how much of the summer you want to swim.

01Summary

What matters most here

  • Remove heat

    Chillers and combined units.

  • Block heat

    Shade and reflective covers.

  • Combine methods

    Often more effective together.

02Detail

Cooling methods

  • Chillers

    Dedicated cooling units.

  • Combined units

    Heat in winter, cool in summer.

  • Shade

    Sails and structures over the water.

  • Features

    Moving water adds evaporative cooling.

  • Night running

    Cooling when air is cooler.

03Before you start

Before choosing

  • Decide target temperature

    For summer use.

  • Assess shade potential

    Over the pool.

  • Check power capacity

    For a cooling unit.

—In practice

How to use this

Combine passive measures — shade over the water, reflective covers when the pool is not in use, avoiding dark finishes in full sun — with mechanical cooling where it is genuinely needed. If a chiller or combined unit is chosen, have it sized to your target temperature and the pool’s exposure, assuming the passive measures are in place.

Mistakes worth avoiding

Relying on water features
Features cool water slightly through evaporation, but waste water doing it and rarely make a real difference in peak summer.
Ignoring shade
Shade reduces heat gain cheaply and permanently. It is usually worth considering before any cooling equipment is bought.

04FAQ

Common questions about this

Can shade alone keep a pool cool?
It helps, but in peak summer many pools still warm up.
Do water features cool the pool?
Slightly, through evaporation.
Is a combined unit worth it?
If you want both summer cooling and winter heating.
When should cooling run?
Often at night for efficiency; settings depend on the unit.

05Read next

More pool guides on this

Filed under heat & cool system installation. Every pool guide is listed on the pool guides page.

—NEXT

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