Pets in the RV
Leave the dog. Know the temperature. Have a plan.
The air conditioner fails quietly, and an RV in the sun heats faster than a parked car. A monitor cannot stop that. It can make sure you find out in minutes rather than hours, and that is the whole difference.
The failure
It is almost never the weather. It is the power.
You left at nine with the AC running and the rig at 72. What happens next is rarely a heatwave. It is the pedestal breaker tripping, a neighbor’s rig pulling the park’s voltage down until your AC compressor stalls, a surge protector doing its job and cutting the power to save the appliances. The AC stops. Nothing beeps. The rig starts climbing at a rate that depends on the sun, the shade and the insulation, and none of those are on your side.
The animal inside has no way to tell you. The only signal that leaves the rig is the one a sensor sends.
Two alerts, not one. A shore power monitor tells you the power went, the moment it goes. A temperature sensor tells you what that did inside. The first gives you a head start measured in the time it takes a rig to heat up; the second confirms whether you need to use it.
Placement
Two sensors, and where they go
One sensor in the shade reads a comfortable number while the bunk under the skylight is baking. The rig is not one temperature.
Where the animal is
At their height, not yours. A crate, the floor by the sofa, the bed they actually use. Heat stratifies, and the reading a foot off the floor is the one they are living in. Keep it out of the AC’s direct airflow, or it reports the vent and not the room.
Where the sun hits
The bunk under the skylight, the dinette by the big window, the side the afternoon sun reaches. This one climbs first and fastest, so it is your early warning. If the animal can get there, it is also where they will be found.
On the pedestal
Not a temperature sensor: a Bluetooth surge protector between the pedestal and the rig. It reports the power going out the second it goes, which is the earliest warning there is, and it protects the AC from the low voltage that stalls it in the first place.
Any verified temperature sensor works. The sensor comparison covers which to buy and why, and the compatibility list is the full set. Setup for the most common one is in the Govee H5075 guide.
Thresholds
Set the alert lower than the danger
The alert is not “the animal is in trouble.” The alert is “the AC has stopped and you have however long it takes to get back.” Set it where a working AC would never let the rig reach, so the first alert is the earliest possible sign that something changed. The app’s example ceiling is 82°F; on a hot day a rig with a working AC sits well below that, and one without climbs through it within the hour.
How hot is too hot for your animal is a question for your vet, not for us. Breed, age, weight and coat all move it. The AVMA’s guidance on pets in vehicles is the place to start, and the honest summary is that the number is lower than most people assume.
Rate of change matters as much as the number. A rig at 78 and steady is a different situation from a rig at 78 and climbing two degrees every ten minutes. The history chart shows the slope. When the alert arrives, look at the chart before deciding how fast to move.
The chain
Every link has to hold, and the last one is a person
For the alert to work: the sensor has to be in range of the hub, the hub has to have power, the hub has to have internet, our servers have to be up, your phone has to have signal, you have to see it, and then someone has to get to the rig. A monitor covers the first six. Nothing covers the seventh but a plan.
- Power the hub from 12V, not the AC outlet. If the pedestal trips, an AC-powered hub goes dark at the same moment the AC does, and you get an offline alert instead of a temperature. Power and connectivity has every combination.
- Bring your own connection if you can. Campground Wi-Fi goes down on the campground’s schedule.
- Have a second number. A campground host, the neighbor in the next site, anyone with a key and a ten-minute walk. Put them in the alert list. The alert reaching you in a canyon with no signal is the same as no alert.
- Test it before the hike. Unplug the pedestal, watch the alert arrive, plug it back in. Sixty seconds, and the one test that matters.
The long version, written from the trailhead: the temperature check you cannot make from a trailhead.
Straight answer
What a monitor cannot do
It cannot restart the air conditioner, open a window, or cool anything. It cannot reach you where your phone cannot. It cannot alert you about a hub that has lost power, beyond telling you that it has. And it is not a life-safety device: RoamVitals is not a substitute for the CO and LP alarms your RV is required to carry, and it is not a substitute for the person with the key.
What it does is turn “I hope the AC is still running” into a number on your phone, and the moment it stops into a message. For an animal in a metal box in the sun, that moment is everything.
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