Why Hotel Room A/C Never Gets Cold
If you have ever set a hotel room air conditioner to its lowest setting and still felt too warm, you are not alone. Most hotel A/C units physically cannot cool a room below about 19 to 20°C, and the temperature most guests actually find comfortable sits between 22 and 24°C. Here is what is really going on, and what the best hotels do about it.
Most hotel air conditioners can’t go as low as you think
Using data from more than 100 A/C units, SensorFlow found that 80% of hotel units cannot cool a room below 19°C, and 60% cannot get below 20°C. Even with the thermostat set to 19°C, the actual room temperature rarely drops below about 21.5°C. So the number on the panel and the temperature you feel are often two different things.
The temperature guests actually want is 22 to 24°C
Across a sample of 1,000 guest rooms, SensorFlow found that the average guest’s preferred temperature lands between 22°C and 24°C. Guests tend to push the dial far lower than that on arrival, then quietly turn it back up once the room stops getting colder. The very low setting was never the comfortable one, it was a guess.
Turning it down to 16°C does not cool the room faster
This is the most common myth. An air conditioner does not work harder or faster because you set it to 16°C instead of 23°C. It simply runs longer chasing a target it will probably never reach, which wastes energy without making anyone more comfortable. Setting the thermostat close to your real preferred temperature, around 22 to 24°C, gets you comfortable just as quickly.
Guests leave, the A/C keeps running
Comfort is only half the story. SensorFlow’s data shows guests are not in their rooms about 50% of the time after check-in, yet fewer than 10% turn the A/C off when they leave. A 2016 study by the energy company E.ON found that one-third of hotel guests admitted using more energy than they would at home, even though half said a hotel’s sustainability mattered to them. Most people want to do the right thing, they just need the room to help them.
How smart hotels fix this automatically
This is where hotel operators come in. Instead of relying on guests to manage the A/C, smart hotels let the room manage itself. SensorFlow’s smart hotel energy management system uses wireless sensors and IoT automation to:
- Detect when a room is empty and ease the A/C back automatically, then restore comfort before the guest returns.
- Hold rooms at a comfortable, efficient set point instead of an unreachable 16°C.
- Let staff adjust any room remotely in response to a guest request.
- Monitor occupancy to plan housekeeping, and flag maintenance issues before they become complaints.
The result: SmartREM has been shown to cut hotel energy costs by up to 30% per room, without guests ever noticing a drop in comfort. SmartREM is a hotel energy saving solution purpose-built for exactly this kind of guest-comfort balancing act. HVAC is roughly 70% of a hotel’s energy use, so guest-room A/C is the single biggest lever a property has. (The same guest behaviour also drives up humidity, which is a comfort and maintenance problem in its own right; see fighting humidity in hotels.)
The takeaway
Guests are not really using the A/C wrong, the room is simply asking them to do a job it should do itself. For guests, the trick is to set the thermostat to around 22 to 24°C and skip the 16°C sprint. For hotels, the opportunity is bigger: automate the guest room and turn one of your largest costs into a measurable sustainability win.
CTA: Curious how much your property could save? Try the energy-saving calculator or book a demo.
FAQ
Why won’t my hotel room air conditioner get cold?
Most hotel A/C units cannot physically cool a room below about 19 to 20°C. SensorFlow found 80% of units can’t go under 19°C. Even set to 19°C, the room usually settles around 21.5°C, so the panel number reads colder than the room actually feels.
What temperature should I set a hotel room air conditioner to?
Around 22 to 24°C. Across 1,000 guest rooms, that was the average guest’s preferred, comfortable range. Setting it there is comfortable and reaches a steady temperature just as fast as any lower setting.
Does setting the A/C lower make the room cool faster?
No. An air conditioner cools at the same rate regardless of the target. Setting 16°C instead of 23°C only makes it run longer toward a temperature it may never reach, wasting energy without cooling any faster.
Why is my hotel A/C not cold even on the lowest setting?
Because the unit’s real floor is often 19 to 20°C, not the number shown. Room factors like sun, sealing and unit size push the achievable temperature higher, so the lowest setting rarely delivers a truly cold room.
How can hotels reduce air conditioning energy costs?
By automating guest-room A/C. SensorFlow’s occupancy-based automation eases cooling in empty rooms and holds efficient set points, cutting energy costs by up to 30% per room while keeping guests comfortable.
