A few ideas for Air conditioned eateries:
Brasserie Balzar, a wonderful time capsule of the 1960s but with air-conditioning! Perfectly executed French classics (as well as a killer Caesar salad), this brasserie is one of the lesser-known historic landmarks of literary Paris; it was a hub for the African American café society that congregated around Richard Wright and James Baldwin.
The air conditioned lobby of Hotel de l’Abbaye Saint Germain is a little haven of peace for an iced tea and nibbles. Laptops welcome.
La Rotisserie d’Argent is classic bistrot with great views.
Alcazar does a great brunch in the 6th and Les Editeurs is classic local’s spot.
Restaurant Boubalé in the Marais
Around the Louvre, hang around in a hotel lobby with character and cool off with some ice teas and snacks at Hotel Regina, one of the old palace hotels that still feels like an old grand dame.
Le Coq & Fils specialises in French chicken like you’ve never eaten it before.
Caché – a secret restaurant in an old button factory in the 20th
Museums with air conditioning
How about going underground? To the catacombs museum or the Musee des Egouts (sewers museum – promise it’s not smelly and way more interesting than you’d think!)
Musée de Cluny (5eme) – a wonderful museum containing all the weird & wonderful stuff medieval Parisians did.
The Musee Arts et Metiers (3eme)
Le musée de la magie & Musée des automates (3eme)
Musee de la Chasse (3eme)
Hotel de la Marine (1st)
The Atelier de Lumières (10eme)
Musee Bourdelle (15eme)
Le musée Marmottan Monet (16eme)
The aquarium de Paris (16eme)
Le musée de la Préfecture de Police (crime museum next to Messy Nessy’s Cabinet!)
Not a museum, but an Art Nouveau masterpiece, walk around the Samaritaine department store, a little less crowded than Le Bon Marché and certainly Galeries Lafayette.
Head to the cinema!
Le Champo is my favourite vintage picture house and it has AC (like most cinemas in Paris).
Swimming!
The Josephine Baker public outdoor pool along the Seine.
Piscine de Pontoise Art Deco public pool.
The iconic pool at Piscine Molitor is open to hotel guests, club members, and those who have booked an Escale Molitor at the spa. So if you’re looking to swim, book a massage and enjoy the rest of the incredible amenities the hotel offers (pools, steam room, sauna, fitness room). Check this link for more information.
Why not try swimming in the Seine! At the base of Pont Louis Phillippe facing the Ile Saint Louis there’s a controlled swimming area, as well as several other spots. There are also air mist “showers” on the Paris Plages if you’d rather not get your swimming costume.