My city just built a heat adaptation network in one summer by borrowing space it already had. It opens on a published temperature trigger

This is a concrete adaptation measure rather than a projection, so I thought it was worth sharing.

Bratislava, Slovakia, around 475,000 people. Our all time national temperature record fell this summer. The previous maximum was 40.3 C from 2007, and this year the south went past 41 C. We also had two separate episodes above 40 C about a month apart, which has not happened here in one season before.

At the end of July the city launched a network of just over 30 free cooling spaces. What I find useful about it is how unglamorous and fast it was.

The service standard is fixed. Every site must have an air conditioned space, seating, drinking water and a toilet. Some add Wi-Fi, books, board games or a children's corner. Nothing has to be bought, which matters because a lot of the sites are commercial.

The network is not open permanently. It activates on a published forecast trigger from the national weather service: three consecutive days at 33 C or higher, or two days at 35 C or higher, or one day at 38 C or higher.

The delivery is mixed. Eight city districts and several municipal organisations run sites, plus private partners including shopping centres, IKEA, two supermarket chains and a bookshop chain. The city says openly that it only coordinates the network and does not operate the individual sites.

Why I think it is interesting: almost none of this is new construction. It is mostly formalising public access to space that was already cooled and already open, then putting a map and a trigger on top. That is why they got roughly 30 sites in a single season instead of a handful over a decade. For cities that keep saying adaptation is too expensive to start, this is a fairly cheap first step.

The honest weakness, and the thing I would like other perspectives on: the city has outsourced the actual guarantee. Hours vary by site, none of them are promised to be open, and a shopping centre was going to be air conditioned anyway. So the real added value is wayfinding plus explicit permission to sit without spending money.

Two genuine questions:

1. Has anyone seen evidence on whether trigger based activation works? My concern is that a network that is only sometimes on is much harder to communicate than one that is always on, and people stop checking whether today counts.

2. Is there usage data anywhere on who actually shows up at cooling centres? The group most at risk here is elderly people in top floor flats without air conditioning and with limited mobility, and I am not convinced they travel to a mall. If someone has seen a city solve the "the people who need it most do not come" problem, I would like to read about it.