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All answers having "Cooler" as clue:

3 Character Answers:

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ADE

CAN

FAN

ICE

PEN



4 Character Answers:

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CELL

ICER

JAIL

STIR

TANK



5 Character Answers:

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ILLER

JOINT

POKEY



6 Character Answers:

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FRIDGE

ICEBOX

LOCKUP

NEATER



7 Character Answers:

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ICECUBE

LESSHOT

NIFTIER

SEDATER



8 Character Answers:

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GROOVIER

HOOSEGOW

ICECHEST



9 Character Answers:

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ICEBUCKET



11 Character Answers:

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OCEANBREEZE



12 Character Answers:

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REFRIGERATOR