What does 'chiller free' mean in a Dubai rental?

'Chiller free' means the landlord pays the district-cooling (air-conditioning) charge, so you won't get a separate cooling bill - though you still pay DEWA for electricity, water and gas. It's effectively baked into the rent. Always confirm it's written in the tenancy contract; if cooling isn't named as the landlord's cost, you could still be billed for it.