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Cost to run a dehumidifier in Western Australia (2026–27)

WA reference tariff · 33.3c/kWh

$0.13 per hour at 400 W

Typical use (8 h/day, 120 days a year at 400 W) ≈ $128/year on the Western Power (SWIS) rate.

Source: WA Government Standard Electricity Prices 2026–27 (Synergy Home Plan A1), effective 1 July 2026

Dehumidifier cost in WA at 8 h/day, 120 days/year (33.3c/kWh)
Model bandPer hourPer dayPer monthPer year
Efficient (200 W)$0.07$0.53$16.18$64
Typical (400 W)$0.13$1.06$32.36$128
High (900 W)$0.30$2.39$72.80$287

Appliance running-cost calculator

WA

Dehumidifier: 200–900 W typical range.

~8 h/day in damp months.

$0.13 per hour · $128/year at your settings
Per day (8 h)
$1.06
Per month
$32.36
Per year (120 days)
$127.73

Tariff: 33.3c/kWh — WA Government Standard Electricity Prices 2026–27 (Synergy Home Plan A1) for the Western Power (SWIS) network, effective 1 July 2026. Wattage basis: EcoFlow AU — dehumidifier power consumption. Full dehumidifier costs in WA →

The same appliance in other states

Cutting the cost

Shut the room's windows and doors so it isn't fighting a fresh supply of damp air, and empty or plumb the tank so it doesn't keep cutting out and idling. Set a sensible target humidity rather than the driest possible setting, and run it only where damp is a genuine problem. Clean the filter regularly. Fixing the source of the moisture cuts the run time more than any setting can.

Frequently asked questions

What does a dehumidifier cost per hour in WA?
$0.13 at the typical 400 W draw on WA's reference rate of 33.3c/kWh (Western Power (SWIS) network). Efficient models run $0.07, high-draw models $0.30.
How is this calculated?
Watts ÷ 1,000 × the tariff = cost per hour, then × hours × days for the period figures. Every figure on this page uses WA's 2026–27 reference rate — change the assumptions in the calculator above.
Is the tariff here what I actually pay?
It's the WA Government Standard Electricity Prices 2026–27 (Synergy Home Plan A1) usage rate for the Western Power (SWIS) network — the government reference. Your market offer may be a little under it; your zone may differ. See WA rates by zone.

Related

Sources — figures current as at 17 July 2026.

~8 h/day in damp months.