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What does cool on mean on thermostat?

Author

Jessica Hardy

Updated on February 22, 2026

What does cool on mean on thermostat?

Cool On means that you have turned on your air conditioner. Be aware, sometimes people install a heat/cool thermostat but don't have an air conditioner. So only heat on works.

Thereof, what does cool on mean on Honeywell thermostat?

Check the thermostat's display to confirm that there's a call for cooling, usually indicated by the words "cool on" or a snowflake icon. If the "cool on" or the snowflake icon is flashing, the thermostat is in delay mode, which can take up to 5 minutes. This delay is to protect your equipment from short cycling.

Likewise, should AC be on auto or on? The fan setting controls your AC's blower; A fan inside your system that helps distribute air throughout your home. AUTO means the fan turns on “automatically” ONLY when your system is heating or cooling your air. When the thermostat reaches your temperature setting, the system, including the blower fan, shuts off.

Additionally, why is my thermostat flashing cool on?

Most Honeywell thermostats blink when in a time delay for the cooling (or heating if it's a heat pump) this time delay feature protects the compressor form cranking too soon following a short off cycle or a power outage. The cool on, heat on, snowflake or flame icon will be blinking if this is the case.

How do I set my thermostat to cool?

You can prep the system to cool the home by moving the switch or pressing the button until you reach the “cool” setting. You will see a number on the thermostat display. This number is the ambient temperature in your home. Use the up and down arrows on the thermostat to set the temperature you want the home to reach.

What does it mean when your thermostat has a snowflake on it?

Check the thermostat's display to confirm that there's a call for cooling, usually indicated by the words "cool on" or a snowflake icon. If the "cool on" or the snowflake icon is flashing, the thermostat is in delay mode, which can take up to 5 minutes. This delay is to protect your equipment from short cycling.

What is a good temperature to set your thermostat in the summer?

78F

How do I reset my AC thermostat?

Here are the steps you need to take to reset your AC thermostat.
  1. Shut Down Your AC at the Thermostat. The first step in resetting your AC thermostat is to turn it off at the AC unit.
  2. Find Your Circuit Breaker Box.
  3. Reset the Circuit Breaker for Your AC Unit.
  4. Wait 30 Seconds.
  5. Turn the AC Thermostat Back On.

How do I know if my Honeywell thermostat is bad?

4 signs your thermostat is bad
  1. Sign #1: Your thermostat has no power or is unresponsive.
  2. Sign #2: Your heater or A/C won't turn ON.
  3. Sign #3: Your A/C or heater runs constantly and won't turn OFF.
  4. Sign #4: Room temperature and setting don't match.
  5. Step #1: Make sure thermostat is on the right setting.

Is 72 a good temperature for air conditioning?

The Ideal Summer Thermostat Setting
For most people, the normal comfort zone temperature sits around 72-73 degrees—but an air conditioner isn't a highly scientific machine. Setting the thermostat at 78 degrees typically keeps enough cool air in the room for comfort.

Will low batteries affect thermostat?

When low batteries eventually die, you'll see a black display screen, the thermostat will stop working and your heating or cooling units won't function. The heating and cooling system cannot respond to nonexistent temperature commands. Follow these steps to replace the batteries in your thermostat.

How do I reset my thermostat after changing the battery?

How to Reset a Honeywell Programmable Thermostat
  1. Set the thermostat switch to "Off."
  2. Insert a coin into the slot on the battery door to push it open.
  3. Remove the batteries.
  4. Insert the batteries backward, so that the negative pole lines up with the positive terminal.
  5. Remove the batteries and put them back in the correct way, then close the battery door.

Why Does My Honeywell thermostat say temporary?

Your thermostat is programmed to achieve certain temperatures at certain times this is your “program“, when you deviate from that program and adjust the temperature it will say temporary, if you hit hold it will say either permanent hold or temporary hold depending on your thermostat.

Will a Honeywell thermostat work without a battery?

Once the batteries go completely dead, the display will be blank and the thermostat will not operate the heating and/or cooling system. Replacing the batteries once a year should prevent the heating/cooling system from shutting down due to lack of battery power.

How do you reset a Honeywell thermostat?

You can also click here to learn how to reset your thermostat. To perform a factory reset, press and hold the settings button while you remove and re-insert one battery. You'll then need to re-link your doorbell push button and any other Honeywell ActivLink devices.

Why does my thermostat say return?

On this particular thermostat, return is indicating that you are currently in the "return" time period of your schedule. You have 4 time periods per day, Wake, Leave, Return and Sleep. Your thermostat will display which time period you are currently running in the programming.

How do I turn off my thermostat?

How to Turn Off a Programmable Thermostat
  1. Lift the cover on the programmable thermostat.
  2. Identify the different controls. You should see a switch for the blower, which allows for either automatic or manual operation.
  3. Move the tab on the switch labeled cooling, heating and off to the off position.
  4. Close the cover on the programmable thermostat.

How do I turn on my cool Honeywell thermostat?

You must manually change the temperature if you prefer a warmer or cooler house. Press any button to back light the screen. Press the "Fan" button to set the fan on Auto or On. Press the "System" button to put the thermostat in Heat, Cool or Off mode.

What is the best setting for air conditioning?

78 degrees Fahrenheit

What should AC be set at?

78 degrees Fahrenheit

Which mode is best for AC?

Tips for making best use of room air-conditioners
  1. 1 – Cool Mode.
  2. 2 – Fan Mode.
  3. 3 – Dry Mode.
  4. 4 – Energy Saver Mode or Smart Fan Mode.
  5. 5 – Sleep Mode.
  6. 6 – Temperature Setting.
  7. 7 – Fan Speed Setting.
  8. 8 – Timer-Off Setting.

Should fan be on with AC?

It's a common belief that ceiling fans should not be used along with Air Conditioners. With a ceiling fan running, you can raise the thermostat of the Air Conditioner by 2 to 4 degrees with no reduction in comfort. Increasing the temperature on the air conditioner can reduce your electricity bills significantly.

Is it OK to leave ceiling fans on all the time?

Air Circulation
Generally, it is acceptable to leave your ceiling fan on for a long time. It's even safe to leave it on when no one is in the room if the purpose of leaving it on is to circulate air and maintain consistent room temperature.

Is it OK to run AC all the time?

Running AC 24/7
It may seem easy to just let your air conditioner run full blast all day long, but doing so wastes a fair amount of electricity. Your body can tolerate higher temperatures when asleep than when awake; moreover, leaving your AC unit idle as temperatures fall helps to prevent freezing up in the morning.

How do I make my air conditioner more efficient?

Air conditioning systems operate most efficiently at full speed during longer periods of time. So kicking it on a lower temperature when you get home will save you more money than the AC cycling on and off while you're away. A programmable thermostat can make it supereasy to keep your AC at the right temperature.

Why does my house feel humid with the AC on?

The inside AC unit has a cold evaporator coil to cool down the air. When running, the coil's temperature is below the dew point, meaning that it's at a temperature where water will leave the air and condense. So as your AC runs, it's pulling moisture/humidity from your air!

What is the best temperature to leave an empty house?

You should set the temperature around 50 to 60 degrees Fahrenheit (℉). Most of the time, dropping the thermostat to 50 °F to save some heating bill is fine. You don't need to set your thermostat too high if your plumbing runs within the interior walls. You should have no issues by leaving the thermostat at 50 °F.

What is the best temperature for sleeping?

In general, the suggested bedroom temperature should be between 60 and 67 degrees Fahrenheit for optimal sleep. When lying in bed trying to snooze, your body temperature decreases to initiate sleep—and the proposed temperatures above can actually help facilitate this.

How should I set my thermostat in the summer?

Operate Your Thermostat Efficiently
  1. Set your thermostat as high as comfortably possible in the summer.
  2. Keep your house warmer than normal when you are away, and lower the thermostat setting to 78°F (26°C) only when you are at home and need cooling.

What temperature should I set my AC at night?

The best temperature for sleeping is said to be between 60° and 67°F. Opening the windows while you sleep is a good solution if you live in a cool climate. Then, closing the windows in the morning before it gets hot traps cool air inside and gives your air conditioner a head start.

Why does my thermostat change by itself?

There are several reasons why your HVAC thermostat keeps changing temperature on its own, but the most likely cause is you have it in program mode. The word 'hold', or 'permanent hold', or something similar should appear on the digital thermostat.

Is it cheaper to keep AC on all the time?

In general, it is cheaper to leave the AC on all day during very hot temperatures. However, turning off the AC during a heat wave can quickly introduce a lot of heat and humidity into your home. After even just a couple of hours, your AC will have to work hard to lower the temperature back to a comfortable level.

Is it better to keep your thermostat at a constant temperature ac?

In most cases, leaving the thermostat temperature constant is aimed at keeping the thermal energy (heat) inside the homes constant. The higher the temperature difference between the two points, the faster the heat loss to the surrounding area. The same applies to house temperatures.

Should I turn off my thermostat in the summer?

Don't ever turn off your thermostat completely off, no matter what time of year. The risks for damage to your home are too great. In the summer or warmer months, we recommend you set your thermostat no lower than 73 – 78 degrees. Remember, little adjustments in temperature really do make a difference!

Is 75 a good temperature for air conditioning?

Typically, our bodies are most comfortable when the air inside our home is 74-76 degrees. So, a safe setting is 75 degrees. However, this is only necessary when you're in your home. If you're like most, you are gone during the day.

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