Prime Big Deal Days 2026: Dehumidifier Prices to Beat (UK)

Amazon's Prime Big Deal Days runs on 6 and 7 October 2026, 48 hours of Prime-only discounts. For dehumidifiers the timing is hard to ignore: it lands just as the heating goes on, the washing moves indoors and the first condensation appears on the windows.

The problem with any sale is the "was" price. A strikethrough figure tells you what a seller once asked, not what the product has actually been selling for. So instead of guessing at deals that don't exist yet, this page records what each dehumidifier cost on Amazon UK on 25 September 2026, a week and a half before the event. If the Prime price on the day isn't below the figure here, it isn't much of a deal.

How to use this list

1. Pick the type first, then the model. Compressor units are the cheapest to run in a heated home. Desiccant units keep working in cold garages, conservatories and caravans where compressors struggle. Our dehumidifier comparison by room size covers the choice in more detail.
2. Compare the Prime price against the 25 September price below, not against the "was" price on the listing.
3. Check it is sold by Amazon or the brand. Several popular models have dropped out of stock at Amazon and are only available from third-party sellers at higher prices. We've left those off this list.

Prices on 25 September 2026

Ratings are Amazon's star rating with the number of reviews in brackets, also taken on 25 September.

What's already discounted

Four of these are already showing a strikethrough price before the event starts:

• Pro Breeze 30L Smart: £189.99 against a listed £199.99.
• EcoAir DC12 MK3: £123.99 against a listed £133.38.
• Avalla X-300: £99.98 against a listed £119.99.
• Hillington 250g car bags: £8.49 against a listed £9.99.

Those are this week's prices, not Prime prices. If the October deal only matches them, you'd pay the same by buying now, and you'd have the dehumidifier running a fortnight earlier.

Which ones to watch

Under £100, one damp room: the Cosi Home 12L is the benchmark. It has the most reviews of any compressor unit here and is already the cheapest. Anything that undercuts £79.99 for a 12L compressor is a genuinely good price. The Avalla X-300 is the quieter alternative if it's going in a bedroom. We compare the whole range in Avalla dehumidifiers compared.

Whole house or drying laundry indoors: the Pro Breeze 30L and Air Pro 20L sit within £30 of each other. At full price the Pro Breeze gives you half as much capacity again for the difference.

Cold rooms, garages and caravans: the Meaco DD8L and EcoAir DD1 are the two desiccant units. They're priced about £5 apart, and the Meaco has far more reviews behind it. Desiccant units rarely get deep discounts, so any drop below £150 is worth taking.

Cars and cupboards: the Hillington bags are cheap enough that a sale saves pennies. Buy them when you need them. Our car dehumidifier guide covers which size suits which vehicle, and there are more options for spaces with no socket in battery and cordless dehumidifiers.

Currently unavailable at Amazon

These were on the list but are showing as "currently unavailable" from Amazon on 25 September. They're only available through third-party sellers, usually at higher prices: Avalla X-150, Avalla X-200, Ebac 2250e, Meaco DD8L Junior and Midea DE 10L. If any come back into stock as a Prime deal, check the seller before buying.

Is it worth waiting until 6 October?

If you have condensation or mould now, probably not. A dehumidifier costs pennies an hour to run, and the damage from a fortnight of damp walls costs more than most Prime discounts will save. If you're buying ahead of winter and nothing is getting worse, waiting costs nothing. Note the price here, check it again on 6 October, and only buy if the Prime price actually beats it.

Prices and ratings were checked on Amazon UK on 25 September 2026 and will change. Prime Big Deal Days prices are only available to Prime members. As an Amazon Associate we earn from qualifying purchases.