A house full of heated enclosures fails differently from a house with one tank. When the power goes, a dozen microclimates begin cooling at different speeds, the sitter cannot watch all of them at once, and well-meant improvisation — candles, hot water bottles, moving animals between rooms — causes its own casualties. Your instructions need to turn a frightening evening into a short sequence of decisions the sitter has already read, in the order they will face them.
Start with a priority list, not a pile of manuals
The first page should rank the enclosures by how fast their occupants get into trouble, with each animal's safe minimum temperature written beside its name. A tropical species in a glass tank in a cold room outranks a brumating tortoise in an insulated box every time, and the sitter should never have to guess which is which at midnight. Tape a copy of the same ranking to the enclosure row itself, so the list survives even if the sitter's phone does not.
The first hour: hold the heat you already have
Most short cuts need no heroics, only conservation. Instruct the sitter to keep every enclosure shut — each opening dumps the warm air you are trying to keep — and to drape blankets or towels over glass tanks, which lose heat fastest. Room doors stay closed, animals stay where they are, and feeding is skipped entirely; a reptile that misses a meal is fine, while a fed reptile in a cold enclosure cannot digest. Write down your electricity company's outage number and how the sitter can check an estimated restoration time, because that estimate drives everything after the first hour.
Backup heat and failed equipment, enclosure by enclosure
For longer cuts, specify your backup heat and its exact rules: hand warmers or heat packs go outside or beneath one end of a container, wrapped, never loose inside where a cold, sluggish animal can lie on one and burn. If you own a generator or battery backup, the instructions must say what it can run — thermostats and heat sources for the priority enclosures first, lights last — and how to start it, in steps a non-keeper can follow. Equipment failure without a power cut gets its own short section: where the spare bulbs, mats and thermostats are stored, which spares fit which enclosure, and the rule that a failed heat source on a priority animal justifies a phone call at any hour.
When to call you, and when to act first
End with decision rules, not vibes. The sitter phones you immediately if a priority enclosure falls below its stated minimum, if the estimated restoration passes a set number of hours, or if anything smells of burning or shows damaged cabling. They act before calling — insulating, applying backup heat, or packing a priority animal into its labelled insulated travel box with a wrapped heat pack — whenever waiting for your reply would lose more heat than the action risks. KinsLe's Care Pass is built for handing over exactly this kind of plan, giving a trusted sitter temporary, clear access to each pet's care routine and key details while you are away, so the instructions live with the sitter instead of in a drawer at home.