Ventilation without drafts

For many rabbit respiratory problems, airflow matters more than temperature. Rabbits tolerate cold far better than they tolerate stale, ammonia-laden air. The goal is steady fresh air without a cold draft blowing across resting animals — and those are two different things.

Why ventilation beats warmth

Urine breaks down into ammonia, which you can often smell before it reaches harmful levels. Ammonia and trapped humidity irritate the delicate lining of a rabbit’s airways and are a common trigger for the sniffles and other respiratory issues. A hutch sealed up tight to keep rabbits “warm” traps exactly the air you most want to move out. Well-ventilated and a little cool almost always beats warm and stuffy.

Draft vs. ventilation — the key distinction

A draft is a focused stream of cold air blowing directly onto the rabbit at rest — chilling, and a stressor. Ventilation is the gentle, whole-space exchange of stale air for fresh. You want lots of the second and none of the first. The difference is usually about placement and speed, not the amount of air.

Aim for steady air exchange

A common husbandry target is around six air changes per hour in an enclosed rabbit space — enough to clear ammonia and moisture without a gale. You do not need instruments: if the air smells clean at rabbit level and surfaces are dry, you are close.

Design for passive cross-flow

• Put vents low on one side and high on the opposite side. Cool air enters low, warms, rises and carries stale air out the top.
• Keep those vents away from where the rabbit sleeps so moving air never blows straight onto it.
• Cover vents with ½-inch hardware cloth so ventilation never becomes a predator entry point.
• Never rely on a single opening — one hole is a draft; two placed well is cross-flow.

Bedding and cleaning are ventilation too

The best airflow cannot outrun a wet, dirty floor. Keep bedding dry, remove soiled material often, and use a hay rack so hay stays clean and off damp bedding. A drop tray or sloped floor that moves urine away from the living area cuts ammonia at the source.

Summer and winter adjustments

• Summer: rabbits handle cold better than heat. Increase shade and airflow, add frozen water bottles, and watch for heat stress (panting, lethargy) above roughly 80°F.
• Winter: block wind and rain, not air. Give a sheltered, draft-free nook out of the wind, but keep upper vents open so moisture and ammonia still escape.

Signs your ventilation is failing

• You can smell ammonia at rabbit level.
• Condensation, damp walls or persistently wet bedding.
• Repeated sneezing, runny noses or watery eyes across several rabbits.
• A stuffy, warm feeling when you put your head near the floor of the hutch.

If you notice these, improve airflow first, then deep-clean — and if respiratory signs persist, seek veterinary advice.

This is general husbandry guidance, not veterinary advice. Respiratory illness in rabbits can be serious; if a rabbit is sneezing, wheezing or has nasal discharge, consult a rabbit-savvy veterinarian.