A flexible range for a Domestic Shorthair
A Domestic Shorthair generally does well indoors between about 65 and 75 degrees, because that mixed-ancestry, medium-length coat insulates without trapping extreme heat. Unlike the fine-coated Rex breeds or the heavy northern breeds, he sits in the adaptable middle, so the goal is choice rather than a single perfect temperature. Give him warm and cool resting options in different rooms at the same time and he will regulate himself by moving, which is exactly what a healthy indoor cat is built to do.
Heatwave arrangements a Domestic Shorthair will use
In a summer heatwave, a Domestic Shorthair sheds heat by stretching out on hard, cool surfaces and going quiet through the hottest hours. Help that instinct along with a thin mat or simply clear access to bathroom tile, a shaded hallway floor or the cool side of a kitchen. Keep curtains closed on the side of the home taking direct afternoon sun, because a favorite windowsill bed can become the hottest seat in the house by mid-afternoon. Refresh his water daily and consider a second bowl near his hot-weather resting place so drinking does not require a trip across warm rooms.
Skip ice-cold interventions. A Domestic Shorthair rarely wants a frozen bed or a fan pointed at his face; room air that moves gently and a genuinely cool surface to lie on solve the problem without startling him out of rest.
Cold snap arrangements a Domestic Shorthair will use
In a winter cold snap, the same Domestic Shorthair trades tile for height and padding. Cold air pools at floor level and slips under doors, so raise his winter bed onto a chair, shelf or low platform and give it sides he can press his back against. A folded blanket he can knead before settling helps him arrange the surface himself. Interior rooms that hold steady warmth from cooking or evening occupation usually beat a spare bedroom that cools overnight, even if the spare room bed looks cosier to you.
If he insists on sleeping near a radiator, check that the spot cannot trap him against a very hot surface and that he has an easy step down. Cats seek the heat source; owners manage the edges around it.
One cat, two seasonal maps of the house
Treat summer and winter as two different maps. The Domestic Shorthair who sleeps behind the sofa in January may be under it in July, and both choices are information rather than stubbornness. When a cold snap or heatwave is forecast, set both the raised padded bed and the cool floor mat out before the weather turns, then watch which one fills. That early setup matters most for older or very young shorthairs, who adjust more slowly and benefit from finding the right spot already waiting.
Contact a veterinarian during extreme weather if he refuses food, hides in a place he never normally uses, breathes fast with his mouth open, or feels limp and unusually hot or cold to the touch. Ordinary weather fidgeting settles; those changes deserve a call the same day.
Making the seasonal setup a household habit
The arrangement only works if it survives busy weeks, guests and cleaning days. Write down the summer mat location, the winter bed location and any blanket or cushion he strongly prefers, and keep that list where everyone who tidies the house can see it. Adding that seasonal map to KinsLe Family Sharing means anyone resetting the room puts your Domestic Shorthair's heatwave and cold-snap beds back in the places he has already chosen.