Air conditioner not cooling

Why my Air conditioner not keeping up with thermostat

As summer comes the use of air conditioners increases way more than any other appliances in the home. What is more upsetting is the fact that the air conditioner is not keeping up with the thermostat? Slow cooling? Is the air conditioner not cooling at all? 

The reasons why your air conditioner is not keeping up with thermostat is Leak of Refrigerant, Fan Motor or Compressor Issues, Dirty Coils, non-calibrated thermostat, Metering Device defects are the reasons why your air conditioner behaves oddly.

As I also went through the same air conditioner problems in the past I have encountered and learned what is the reason behind this.

If you are also facing these problems with your air conditioner unit this article might be very helpful to you.  

To know more about these issues and how can you fix these air conditioner problems keep reading this article.

Non-calibrated thermostat

The thermostat helps you to maintain room temperature. By sensing the outside temperature and accordingly changes the indoor temperature as your comfort and setting.

Sometimes the thermostat calibration gets disturbs and requires recalibration from time to time.

How can you check if your thermostat needs calibration or not?

If you have set your thermostat cooling temperature to 71 degrees Fahrenheit and your air conditioner shows 68 degrees Fahrenheit,

It means that your thermostat requires calibration.

How to calibrate your thermostat?

You can calibrate your thermostat by two means, yourself or calling a thermostat service professional.

If you don’t know anything about thermostats then I recommend you to call your nearest service center to help you with this.

As they are professionals they will charge you some bucks for their service.

You can calibrate your thermostat by yourself easily if you have some basic knowledge of thermostats.

Calibrate your thermostat by resetting your thermostat to the factory setting and reprogramming your cooling setting again, which is easy to set up.

You can take help from our how to reset the thermostat guide and how to program your thermostat.

Refrigerant leaking

air conditioner condensor coil

Leakage in the air conditioner unit is one of the reasons why your air conditioner behaves oddly.

If your air conditioner is leaking there are chances that the reason your air conditioner is not cooling efficiently and not cooling at all.

How to check your air conditioner is leaking?

To check that your air conditioner is leaking or not.

You have to open the front cover and look for any stain or moisture in the coil, wielded area, and at the joints.

You can also run a leakage test for your air conditioner unit which requires an outsourced gas refrigerant unit.

Connect it to your air conditioner unit and pass the high-pressure gas and observe the leak with the help of soap water and normal water.

How can you fix your leaking air conditioner unit?

To fix the leaking in your air conditioner you will require a brazing unit to wield the leaking pipe or part which requires a professional and experienced person for the job.

I will recommend you to call your customer support service center to get it fixed.

Defect in Fan Motor

fan motor air conditioner

Defect in fan motor unit is one of the reasons why your air conditioner not keeping up with thermostat.

What it does is when your fan module runs it gets heat up quickly and to cool down the motor,

The air conditioner stops the fan unit, and your room temperature starts increasing after the motor gets cool it takes time to reach the set temperature in the home again.

How you can check that your air conditioner fan motor is faulty?

The Dust and dirt particles stuck in the shaft of the fan motor unit increases the stress and strain in the motor and slow down the fan speed and start heating quickly.

Look for any dirt in the motor shaft and clean it thoroughly for free movement of the motor shaft.

Faulty Compressor Unit

comperssor unit air conditioner

Sometimes the faulty compressor is the reason why your air conditioner not keeping up with thermostat.

Faulty compressor leads to, Slow cooling in the room, No cooling in the room, air conditioner not blowing cold air, and many more.

There are many ways your compressor unit get defects.

Check your outside unit working fine. If not working fix the issue immidieatly.

 Overheating of compressor

Overheating of the compressor unit is the most common defect you can find in most of the air conditioner unit in summer because of the long-running hours and continues cooling make your compressor unit get overheat.

Slow pressure buildup in the Compressor unit

IF your compressor unit starts to slow the pressure building process then it is the sign of a faulty compressor unit that can lead to slow cooling and no cooling at all.

To prevent this you have to clean dirty filters and service your air conditioner from time to time.

Air conditioner compressor making weird noises

Noises your air conditioner makes is the sign of any defect and upcoming issue in your air conditioner never ignore this.

If your air conditioner starts making loud noises then check immediately what causing this noise.

Sometimes the reason behind wired noises your air conditioner makes is loosened parts, empty lubricating oil, and many more.

Dirty Coils

One of the reasons why your air conditioner not cooling the home is dirty coils. There are two types of coils in the air conditioner.

Condenser coils, and evaporator coils. The condenser coil is located in the outdoor unit and the evaporator coil is located in the inside unit.

Condenser coil unit 

The condenser unit is located in the outside unit of the air conditioner.

as located in the outside unit the chances of getting dirty are more.  dirty condenser coil not efficient to remove heat from the inside.

Dirty condenser coil leads to slow cooling.  it also increases your monthly energy bill.

 cleaning condenser coil from time to time is required. 

Evaporator coil unit

The evaporator coil unit is located in the inside unit of your air conditioner. it helps to transfer cool air and heat air by passing air through the coil. 

Sometimes the evaporator coil gets freeze that makes Movement of air-restricted and your temperature increases.

Cleaning your evaporated coin required professional cleaner. 

Service your air conditioner timely for uninterrupted cooling in your homes.

Defective Metering device

Defect in meeting device is one of the reasons why your air conditioner not cooling the room.

What metering device does is, it provide the amount of refrigerant pass through the evaporator coil for cooling and heating purpose.

If the device is defective the amount of refrigerant that passes through the coil doesn’t cool or heat the air properly. 


As we have seen there are many factors that can affect the cooling of the air conditioner. 

Thats why your air conditioner not keeping up with thermostat.

To make your air conditioner work efficiently and cool gently without any issue you have to service your air conditioner regularly. 

Servicing the air conditioner regularly makes your air conditioner work smoothly without any noise and saves your monthly electricity bills.

You can check the below video if your air conditioner not cooling.

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