It’s a stinking hot day, you’re heading out the door, the house is locked up… and your dog is about to spend hours in whatever temperature the place turns into by mid-afternoon.
That’s why so many people ask the same question every summer: should you leave the air con on for your pets?
Sometimes, yes. Other times, you can set things up safely without it. The goal is not to freeze them. It’s simple: your pet needs a reliable way to cool down.
At Jordan Dog Training, we look at it like this: comfort affects welfare, and it affects behaviour too. A pet that’s too hot can’t properly rest, can’t settle, and often ends up more anxious, restless, barky, or destructive.
Quick answer
If your home heats up during the day, you’ll be away for hours, or your pet is in a higher-risk group, leaving the air conditioner on (even lightly) can be the safest choice.
If your house stays genuinely cool and your pet has good cooling options (cool surfaces, airflow, shade, fresh water), you might not need to run it all day.
Why heat sneaks up on pets
Dogs cool themselves mainly through panting. Cats often cope by finding cool hiding spots and sleeping through the heat.
The issue is when the environment works against them, like:
- still air
- warm rooms with direct sun
- a house that traps heat
- limited access to cooler surfaces
A pet can look “fine” for a while, then gradually become uncomfortable or distressed as heat builds over the day.
Signs your pet is too hot
Every pet is different, but these are common signs they’re struggling with the heat.
Dogs
- Heavy panting that doesn’t settle
- Drooling more than usual
- Restlessness, pacing, can’t relax
- Lethargy, seeming flat, not wanting to move
- Seeking tiles, bathrooms, shaded corners
- Vomiting or diarrhoea
- Looking distressed
Cats
Cats often hide and sleep more, but panting in a cat isn’t normal and should be taken seriously.
If your pet looks distressed, weak, or “not right”, it’s always safest to seek veterinary support promptly.
Pets that are more likely to struggle in the heat
Some pets have a smaller safety buffer in hot weather, including:
- Flat-faced dogs and cats (short-nosed breeds)
- Older pets
- Pets carrying extra weight
- Pets with heart or breathing issues
- Thick-coated dogs
- Very young animals
- Small pets in hutches or cages (they can overheat quickly)
If your pet fits any of these, it’s worth leaning more cautious on hot days.
When to leave the air con on for your pets
Here’s the plain-English version.
Leave the air con on (even lightly) if:
- Your home warms up quickly during the day
- You’ve got sun-facing rooms that heat up (west-facing windows are a classic)
- It’s humid and muggy
- You’ll be out for a full workday with no one checking in
- Your dog or cat is in a higher-risk group
You might not need it if:
- Your home stays genuinely comfortable inside
- Your pet can move around and choose cooler areas
- You’ve set up shade, airflow, and water properly
- Your pet reliably settles in cooler spots
A simple gut-check is: would you feel okay sitting in that house for eight hours with no way to cool down?
If the answer is no, your pet shouldn’t have to either.
Quick checklist before you leave
This covers the big risks without overthinking it.
Before you head out:
- Water topped up in more than one bowl
- Blinds or curtains down in the hottest rooms
- Your pet can access tiles or a cool surface
- Airflow is reasonable (not a sealed, still “hot box”)
- No heat-trap rooms (direct sun + no ventilation)
- Higher-risk pet? Air con on at a moderate setting
How to set up a “cool zone” at home
Whether you run air con or not, a cool zone is one of the best things you can do.
Pick one main room and set it up as your pet’s comfort base:
- Blinds down to block heat
- Fresh water nearby
- A comfortable bed plus a cooler surface option (like tiles)
- A calm setup so your pet can actually rest
A quick crate note
If your dog is crate trained, that’s great, but make sure the crate is in the coolest part of the home with decent airflow. A crate in a warm corner can hold heat.
If you don’t want to run air con all day
You can still keep pets comfortable, as long as you give them real cooling options.
Practical ideas:
- Keep pets in the coolest part of the house during the hottest hours
- Create safe airflow (internal doors open where appropriate)
- Use fans safely (stable placement, cords not accessible)
- Extra water stations so one tipped bowl doesn’t become a problem
- Frozen water bottles wrapped in a towel as a “cool pack” option
- For water-loving dogs, a shallow paddling pool in deep shade can help
What you want to avoid is the classic trap: outside in “shade” with still air, where the shade moves and the heat builds anyway.
The Jordan Dog Training take
This isn’t just a “comfort” issue, it affects behaviour too.
A dog that’s too hot is far more likely to be restless, barky, clingy, and unable to settle. If you’re trying to build calm routines and domestic good manners, managing heat is one of those quiet wins that reduces the daily chaos.
Less discomfort, less stress, more freedom.
If you want more practical, real-life dog ownership tips, the Jordan Dog Training website has a stack of searchable blogs that can help.
Frequently Asked Questions
What temperature is too hot for pets inside?
There isn’t one perfect number. It depends on your pet, their health, humidity, and airflow. A better guide is this: if your pet can’t settle, is panting heavily, and can’t find a cooler place to rest, your home is likely too warm for them.
Should I leave a fan on instead of air con?
Fans can help with airflow, which many pets appreciate. Air con can be more reliable on very hot or humid days, especially for higher-risk pets.
Should I leave my dog outside in the shade instead?
Only if you can guarantee deep shade all day, excellent airflow, cool ground, and plenty of fresh water. Many outdoor areas still become heat traps, even in shade.
Should I leave the air conditioner on for my dog when I’m at work?
If your house heats up, you’ll be gone all day, or your dog is higher risk, leaving the air con on at a moderate setting is often the safest call.
Disclaimer: The information provided in this blog is intended as general guidance and is based on our experience as dog trainers and behaviourists. It is not veterinary advice and should not replace consultation with a qualified veterinarian. If you have any concerns about your dog’s health, wellbeing, or mobility, we always recommend speaking with your vet to ensure the best care for your dog.
