Bright Light and Direct Sun Are Not the Same Thing
Your bird needs a clear day and night pattern and benefits from real daylight, but that does not mean its cage belongs in the sunniest square of the room. Bright indirect light, a few feet back from a window where the room is lit but the cage is not baking, gives the visual day length and brightness cues that support sleep, moult and appetite without a heat load. Direct sun is a separate, deliberate activity rather than a cage position: offered in short sessions, partly shaded, with airflow, and then finished. Treating those two things separately is the whole answer to this question, because most overheating stories begin with a cage left permanently where midday sun pours in.
Place the Cage for Light, Shade and Airflow
Choose the everyday cage spot by watching it across a full day, not just in the morning when you set it up. A position that is pleasantly bright at breakfast can sit in a hard shaft of sun by early afternoon as the light swings round, so check where the sun patch lands at several times before deciding. Keep at least part of the cage out of any direct patch at all times, keep the cage away from radiators and cooking heat as well as sun, and favour a spot with gentle natural air movement rather than a still corner or a direct draught from an open door. If the only bright room is a sun trap, sheer curtains soften the light usefully for everyday exposure.
Add Real Sunshine in Short, Deliberate Sessions
For the benefits ordinary glass filters out, offer genuine outdoor or open-window sunshine as a session, a few times a week in fair weather, rather than as an all-day exposure. Carry the cage to a spot that is half sun and half shade, stay nearby, and let your bird position itself, because a bird that shuffles into the sun patch, fluffs and stretches a wing is regulating itself exactly as it should. Keep sessions modest, offer water, and bring the cage back in before the day heats up or the shade you counted on slides away. In darker seasons, a bird-specific full-spectrum light over part of the cage, on a consistent daily timer, can support the light routine, placed so your bird can also move away from it.
Watch the Bird, Not Just the Thermometer
Room temperature alone will not tell you whether your individual bird is comfortable, because a plump, resting bird and a small, active one handle the same warm room differently. Learn your bird's relaxed posture, sleek but not flattened feathers, normal breathing with a closed beak, ordinary eating and calling, and treat wings held away from the body, panting with an open beak or unusual quietness as instructions to cool things down immediately: more shade, cooler air, fresh water, and quiet. If those signs persist once the cage is cool, or your bird seems weak or unsteady, seek an avian veterinarian promptly. On KinsLe, Family Sharing gives relatives you pick access to its profile, so the sharing stays with family you have chosen yourself.