Mr. Cool Always Running – What Could Be Wrong?

Having your Mr. Cool always running when you expect it to turn off can be troubling, because it could increase your electricity bills. If you’re wondering what could be wrong, then you are in the right place. We did our research and looked into Mr. Cool reviews about this concern, and this is what we found out.

There is nothing wrong with your Mr. Cool running for several hours. It is equipped with inverter technology that actually doesn’t make your AC cycle turn on/off as central air conditioners do. While your outdoor unit stays on, it uses minimal power to maintain the display temperature. 

Hopefully, this gives you an idea that you have nothing to worry about due to your Mr. Cool always running. Keep reading, as there are other frequently asked questions about Mr. Cool, and we’ll answer them here. First, we’ll cover—in a simple way—how inverter technology works.

Changing the AC level using a remote, Mr. Cool Always Running — What Could Be Wrong?

Why An Inverter AC Unit Is Always Running

Another term for inverter technology is variable frequency drive (VFD). As the name suggests, the frequency varies its speed if the incoming alternating current’s frequency changes.

Air conditioning inverters on the back of the house

With the use of a rectifier and electrical inverter, the desired frequency is achieved, resulting in improved efficiency and less power consumption.

VFD controls the speed of your outdoor fan motor, which in turn, controls the compressor. The compressor pumps the refrigerant (or coolant) through the copper tubes (coils) to exchange the absorbed heat indoors with cooler air.

Unlike a conventional AC that resets the compressor in a cycle, this non-stopping VFD is flexible to changes in reaching and keeping the set temperature.

It uses the required minimum energy to prevent the outdoor unit from going off. It consumes less compared to the energy required starting over the cooling process, helping you save more on your monthly bills.

When the room changes from the degrees in the thermostat, there will be a small increase in the speed of the outdoor fan to balance the slight change.

This mechanism saves more energy than the reset cycle, because it doesn’t fluctuate from complete shut-off to sudden high-power starting to get the desired coolness again.

Does Mr. Cool ever shut off?

Changing the AC temperature using a remote

Yes, it does. You can turn your Mr. Cool off by manually pressing the On/Off button on your remote. If you want to program the device to automatically turn on or off at a certain time, you can use the timer On/Off option.

Every press raises the auto time setting by 30 minutes. When the setting time reads 10, pressing will advance the auto time setting by increments of 60 minutes.

Simply set the auto on time to zero to stop the auto-time programs from running, as shown in this video below:

Similarly, you can do this using the sleep button. In cool mode, it will add two degrees to the room temperature after an hour and add another two degrees in the following two hours. The AC will turn off on its own in 7 hours.

How do I reset my Mr. Cool unit?

There may be times when you want to reset your Mr. Cool unit to see if doing so will make a difference.

Once you've made sure that there isn't a refrigerant leak in the line set and your Mr. Cool unit still isn't cooling, you can try the method shown in the video as a last option to reset the entire system:

Here is a quick read on the steps mentioned in the video:

  1. Start by removing the outdoor unit's top covers.
  2. Find the LED display and the nearby black button.
  3. Press and hold down the button until "CE" appears on the LED display.
  4. Reassemble everything you removed.

When someone asked in the comments how the YouTuber knew that this is a factory reset, Father & Son Handy Skills answered that he was told by Mr. Cool's technical department that this is a reset procedure. He also added that this method solved his issues so far.

What is an auto mode on Mr. Cool?

In the Auto mode, the unit may logically determine the modes of "Cool," "Fan," and "Heat" by detecting the difference between the real-time room temperature and the temperature selected on the remote control.

If you get uncomfortable with the Auto mode, you can choose the desired mode manually.

Why A Non-Inverter AC Unit Is Always Running

An air conditioning unit mounted for the living room

While it is normal for an inverter AC to go non-stop for hours, having a non-inverter AC that is always running is something to be concerned about. Non-inverter ACs are supposed to cycle on and off when attaining the display temperature.

The AC should be checked, and the safest course of action in this situation is to call in a professional.

For a more in-depth guide, you can check out our previous article that delves into this topic.

Why is the air conditioner running continuously with no cooling effect?

Changing the temperature of the AC using a remote

Checking the air filter should be your first step if your AC runs continuously but doesn't give any cooling effect. A clogged filter prevents air from entering your home through your cooling system.

Clogging in the condenser coil could also be the cause of your AC running but failing to lower the room temperature. The outdoor fan sucks air into the condenser coil to remove collected heat from your house.

Airflow restrictions are among the most frequent causes of an AC running non-stop. In order to cool your home, your AC requires a specific volume of airflow.

The AC system will operate longer in an effort to bring in enough air if something is obstructing the airflow, resulting in a device that overheats and performs poorly.

Is it OK for AC to run all day?

An AC often runs for several hours each day, and it is made to do that, although it is important to take note that its compressor should not operate continuously throughout the day.

The compressor should turn off automatically when the temperature in the room reaches the specified level.

Is it bad to keep turning AC on and off?

Changing the temperature of the living room air conditioning unit

It is bad for your cooling system when it continually turns on and off. Your AC requires more energy to start up than it does to function smoothly over longer cycles. Additionally, it puts additional strain on the systems that switch on your AC.

Your home will become warmer when it’s not supposed to, and your energy bill will increase as a result of your AC having to run at lower speeds for shorter periods of time (short-cycling) because of frequent on and off cycles.

This activity puts more stress on your AC unit, which could cause it to age prematurely and force you to replace it.

Do mini-splits save on electricity?

A mini-split system has several benefits, including being energy efficient. According to a study from the University of Texas, a mini-split with zoning can save your energy costs by as much as 34 percent.

A mini-split's efficiency is mostly due to its lack of ducting operation. Mini-splits do not experience the energy losses that conventional AC systems suffer.

Ductless mini-splits use around 700 to 1,800 watts per hour. A mini-split AC system will consume more watts per hour if all of the zones are set to cool. If a single zone is being used, it will be near the minimum end of the range.

If you're just about to install a mini-split, you might need support for your outdoor unit. We recommend using a lightweight but sturdy mounting bracket.

Click here to see this mounting bracket on Amazon.

In Closing

Changing the AC level using a remote

There are two distinctions in the technology AC systems use today: inverter AC and non-inverter AC. Mr. Cool mini-splits are inverter ACs, so it's normal to be running for several hours.

Remember that it adjusts its power usage accordingly to your room’s changing temperature.

If you are using a non-inverter AC, however, and your system doesn’t cycle on and off in an hour even upon reaching the set temperature, don’t hesitate to call in an HVAC technician. 

We have some other related articles that will help you learn more about ACs. If you liked this post, you might also like the following:

Air Conditioner Fan Running Too Slow—What Could Be Wrong?

Why Is My Air Conditioner Light Blinking?

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