The pet hideaway 1 comprises a number of tubular modules 2 connected together using a connection part. The connection part may be integral or separate from the module, and allow a releasable connection. The tubular modules may receive a heating/cooling unit which is a thermal store. The thermal store may be a solid, liquid, gel. There may also be a heating unit using supersaturated liquid or supersaturated gel where the user can initiate crystallisation to release heat energy over time. Also claimed is a plurality of tubular modules and a kit comprising modules and connectors and kits comprising modules and heating and heating cooling units.