Cold water is the whole point
Almost every other aquarium pet wants warmth added; an axolotl wants it kept away. Its water should sit roughly between 60 and 68 °F, and sustained warmth above that range suppresses its appetite and immune system and invites the fungal problems axolotls are known for. That single fact reorganises the room: there is no heater in the tank, the filter and lights should add as little heat as possible, and the tank thermometer becomes the most-checked instrument in the house. Everything else in this article — where the tank stands, how the room is heated, what happens in a heatwave — is a consequence of defending that cool band.
What your central heating does to the tank
The awkward season is winter, not summer. A living room held at comfortable shirt-sleeve temperature all evening will pull a still tank up with it, degree by degree, until the water sits warmer than the axolotl should live in — and the radiator on the same wall speeds the whole process along. Site the tank on an internal wall away from radiators and sunny glass, choose the coolest suitable room rather than the most sociable one, and expect to run a clip-on fan across the water surface or mesh lid to buy a few degrees of evaporative cooling. In a genuinely warm spell, a dedicated aquarium chiller is the honest solution; frozen bottles are a stopgap that swings the temperature rather than holding it.
A dim animal in a bright home
Axolotls have no eyelids and come from deep, murky, plant-choked water, so they experience bright light as exposure, not ambience. The room changes that follow are simple but non-negotiable: no direct sun falling on the tank at any hour, no bright white aquarium light fitted for the plants' benefit, and enough hides — pipes, caves, plant cover — that the animal can always choose darkness. A low, warm-toned light for viewing in the evening is fine, and a naturally shaded room with indirect daylight suits an axolotl better than a bright south-facing one. If the tank shares a room with a television or reading lamps, angle matters more than brightness: keep the direct glare off the glass.
The household compromises an axolotl asks for
Keeping one axolotl quietly renegotiates the room for everyone in it. The thermostat stays a touch lower than some people would choose, curtains may stay drawn on the tank's side of the room through a sunny afternoon, and guests need gently telling that turning the heating up or switching the tank light on for a better look are the two unhelpful kindnesses. None of it is extreme — the room stays perfectly liveable — but it works only when the rules are shared rather than carried in one person's head. Put the axolotl's temperature ceiling, cooling plan and lighting rules on its KinsLe profile through Family Sharing, so the whole household works from the same details.