If you're a pet owner in the Phoenix area, you already know how brutal our summers can get. But have you ever stopped to think about what your dog or cat is dealing with inside the house while you're at work or on vacation? Getting the thermostat setting right is one of the simplest things you can do to keep your furry family safe and comfortable. As an HVAC tech and pet owner myself, I want to walk you through exactly what temperatures to aim for, how to adjust for your specific animal, and when your system might need professional help.
For most healthy dogs and cats, the ideal house temperature when you are away is typically between 68 and 75°F. If you have a mixed household with both types of pets, 72°F is a safe perfect temperature setting that works as a reliable starting point. Short-haired or small pets usually do better at 70 to 73°F, while thick-coated breeds can stay comfortable closer to 68 to 70°F.
Living in the Phoenix area adds a layer of urgency to this conversation. Our summer heat is extreme, and indoor summer thermostat settings should rarely be higher than 78°F for pets, even when the house is empty. On the flip side, do not set the thermostat higher than 85°F, as that can cause discomfort, increase the risk of heat-related illness, and even encourage mold growth.
Here's a quick recap of the essentials:
Pets regulate body heat very differently than humans do. Dogs rely heavily on panting to cool down because they can only sweat through their paw pads, which doesn't do much when the air around them is already hot. Cats have even fewer sweat glands and typically reserve panting as a last resort. Instead, they rely on behaviors like stretching out on cool surfaces, grooming, and finding the warmest or coolest spots in the house depending on the season. Because of these differences, what feels fine for you might not be comfortable or safe for your pet.
Dogs and cats can overheat or become chilled indoors if the thermostat setting is too extreme. During Arizona summers, a house with the AC turned off or set too high can heat up fast, pushing indoor temps into dangerous territory within hours. And while our winters are mild compared to most of the country, desert cold snaps in January can catch pet owners off guard, especially at night when temperature drops are steepest.
Here's something worth noting for multi-pet homes: most cats prefer slightly warmer temperatures than most dogs. Cats can tolerate warmth up to the mid-80s°F, while many dogs start getting uncomfortable in the upper 70s. That means your household needs a middle-ground thermostat setting that keeps everyone reasonably happy, and 72°F tends to hit that sweet spot.
Several factors narrow the recommended temperature ranges even further:
This is your quick reference section. If you only remember one thing from this article, let it be these numbers. The ideal thermostat setting for pets is between 65°F and 78°F, but the best temperature for most situations falls in a narrower band.
Summer away-from-home range:
Winter away-from-home range:
Multi-pet households:
Homes in Tempe, Phoenix, and nearby communities should be especially cautious not to exceed 78°F indoors in late June through early September, even if no one is home. Our extreme outdoor heat means that walls, windows, and ductwork absorb and radiate warmth, so the actual temperature in some rooms may be several degrees above what the thermostat reads.
Collins Comfort Masters technicians can help fine-tune these recommended temperature ranges based on your specific system, insulation, and home layout. Sometimes the difference between a comfortable pet and a stressed one comes down to ductwork or calibration, not just the number on the wall.
There is no single perfect temperature setting that works for every animal. A Siberian Husky and a Chihuahua have very different needs, and coat type is one of the biggest factors to consider when you determine what works best.
Coat type adjustments:
Age adjustments:
Health adjustments:
I always encourage pet owners to speak with their veterinarian about specific needs and call Collins Comfort Masters to make sure the hvac system can reliably hold these temperatures without hot or cold spots throughout the house.
Phoenix and Tempe have unique climate challenges that most of the country simply doesn't deal with. We're talking triple-digit heat from June through September, with outdoor highs regularly reaching 105 to 115°F. Then winter rolls around, and while our days are mild, desert nights can drop into the 40s or even 30s in December and January. Each season calls for a slightly different approach.
Summer thermostat guidance:
Winter thermostat guidance:
Humidity and dry air:
Schedule routine HVAC maintenance with Collins Comfort Masters in early spring and fall to make sure your equipment can maintain these recommended temperature ranges for pets all season long. A well-tuned system is more reliable and costs less to run.
Thermostat numbers are only part of the story. Watching your pet's behavior is just as important, because no two animals react the same way to a given temperature. Here's what to look for.
Signs your pet is too hot:
Signs your pet is too cold:
Try a simple temperature journal:
For a few days, note the thermostat setting, time of day, and your pet's behavior. This helps you determine the best temperature for that specific animal in your specific house. You might discover that 74°F works perfectly for your dog in the afternoon, but your cat wants it a touch warmer at night.
If your pets regularly show these signs even with reasonable thermostat settings, a Collins Comfort Masters technician can check for uneven room temperatures, duct issues, or thermostat calibration problems. Sometimes the issue is not the setting itself but how well air reaches the rooms where your animal actually spends time.
Smart thermostats are a game changer for Tempe pet owners who are away at work or traveling during peak summer heat. I've had customers tell me they used to worry constantly about their pets during the day, and a smart thermostat basically eliminated that stress. Being able to pull up your phone and see exactly what the house temperature is, then make a quick adjustment if needed, is worth every penny.
Smart thermostat features that help pets:
Integration with cameras and sensors:
What Collins Comfort Masters can do:
This technology reduces worry during summer vacations, weekend trips, or long workdays when pets stay indoors. You can save energy by letting the system run only as much as needed while still keeping things in a safe range for your pet.
Your thermostat setting is the foundation, but a few simple home tweaks can make that temperature feel even better for your pets. Think of it this way: the thermostat controls the air, but your pet's actual experience depends on where they rest, how much water they have, and whether the sun is baking their favorite nap spot.
Create cooler or warmer zones:
Airflow and shading:
Hydration and safety:
Test before you commit:
Try your planned thermostat settings on a weekend when you are home so you can observe how your pets react. Watch for the behavioral signs covered above. This lets you protect your pet by dialing in the right setting before leaving them alone for a full workday or trip.
If you struggle to keep your house temperature within the recommended temperature ranges for your pets, the hvac system may need professional attention. A thermostat set to 76°F doesn't mean much if the system can't actually maintain that number when it's 112°F outside.
Schedule a visit if you notice:
What Collins Comfort Masters offers:
Air conditioning repair, seasonal HVAC maintenance, smart thermostat installation, and duct cleaning for homes in Tempe, Phoenix, Chandler, Mesa, and nearby communities. We're set up to handle the unique demands of desert climate control.
Preventive maintenance matters:
Schedule maintenance in early spring and fall to prevent mid-summer breakdowns that could leave pets at risk in extreme heat. A system failure on a 110°F day is not just inconvenient. It's a safety emergency for your animal.
When you call, let us know that you have pets at home. Our technicians can help fine-tune the thermostat setting for both your pet's comfort and energy efficiency, and we can check that every room in your household is getting the airflow it needs.
Using the above information, you can take confident control of your home's climate and keep your pets safe in every season. Whether you need a new thermostat, a tune-up, or just some honest advice about what temperatures to target, Collins Comfort Masters is here to help.
For most indoor dogs, 80°F is usually too warm for long stretches, especially during Phoenix-area summers. That temperature puts dogs closer to the upper boundary of their comfort zone and can increase the risk of heat stress, particularly for larger or thick-coated breeds. Many healthy adult cats tolerate slightly warmer temperatures and can handle the low 80s, but a house temperature between about 74 and 78°F is a safer, more reliable target for mixed-pet households when you are away. Homes in Tempe and Phoenix should stay below 78°F indoors during June through September whenever pets are present.
Small changes of 2 to 3 degrees between day and night are usually fine and can help you save energy without affecting your pet's wellbeing. But big swings of 8 to 10 degrees can stress both pets and the hvac system. Rapid temperature drops make it harder for animals to adjust, and forcing the system to recover from a large setback uses more energy than maintaining a steady range. Using programmable or smart thermostats to make gentle, gradual adjustments is a much better approach than large manual jumps. Keep overnight and daytime settings within the same recommended temperature ranges so your pets are not dealing with frequent major shifts.
Most cats are comfortable around 69 to 72°F when you are home and about 68 to 70°F when you are away for the day. I would advise not letting house temperature drop below roughly 66 to 67°F for short-haired or senior cats, especially at night. Providing warm beds near interior walls can help cats stay cozy even at the lower end of these settings. And remember, do not set the heat below 50°F in any season, as that risks freezing pipes on top of putting your cat in a cold, uncomfortable environment.
Puppies and kittens younger than about six months are more sensitive to cold and heat and usually need the warmer end of the recommended range. I suggest keeping the thermostat closer to 72 to 74°F for young pets when you are away and limiting how long they are left alone. Their small bodies lose heat quickly, and they haven't fully developed the ability to self-regulate the way an adult dog or cat can. If you have very young or very small pets, talk to your veterinarian about temperature needs and consider shorter absences until they are a bit older.
Absolutely. Clean coils, proper refrigerant levels, and clear ducts help your system maintain a steady indoor temperature without big hot or cold spots. A system that's low on refrigerant or has clogged filters has to work harder and still may not cool the house evenly. In the Tempe and Phoenix climate, annual or twice-yearly maintenance significantly reduces the chance of AC failures on 110°F days when pets are home alone. Collins Comfort Masters technicians can also verify thermostat accuracy and check airflow in the specific rooms where your pets spend the most time, making sure the numbers on the wall match what your pet is actually feeling.