Why is my Air Conditioner Not Keeping Up With Thermostat?

Air conditioning problems are always a headache. There could be any number of reasons why something happens and pinpointing that reason can be difficult. A lot of people have trouble with their air conditioner not keeping up with thermostat. This can be a major issue as during the summer in the heat no one wants to have to deal with their air conditioner blowing hot air when it should be blowing cool. So, let's dive into why this happens and if it does happen to you, how can you fix it.

​Plan Ahead

Plan Ahead

If your air conditioner is not keeping up with its thermostat, a good solution is to plan ahead. If you will be leaving your home for a given amount of time, leave your AC on. You do not have to turn it on a super cold setting either. A good temperature like 80-degrees is sufficient enough to have your AC ready for the warm summer day. Preparing your AC in this manner will help it get a head start for the day. So, before you leave to go to work in the morning, try turning your AC on at a good temperature. Also make sure that your AC has a great SEER Rating. Click here for our article on Best Ductless Air Conditioner! Top Mini Split AC Heat Pump Reviews

Check Those Evaporator Coils

Placing your hand over the air vent of your conditioner and feeling no cold air being blown out can be traced down to dirty evaporator coils. The evaporator coils are what the cold air is blowing through. So, if you have dirty coils, air will have a hard time getting past them. Overtime, these dirty coils can freeze up and eventually block all the cool air that you are looking for. Cleaning your evaporator coils is already a recommended maintenance, so, doing so might fix your problem. 

Dirty Coils

Let’s start off with a common cause for your air conditioner not keeping up. Many people fail to see the importance of AC maintenance. As such, they will let their coils get dirty. This is a major fault and cause of AC malfunction. There are two types of coils in your air conditioning system: condenser coils and evaporator coils.

Condenser coils are important for cooling off air. The way air conditioning systems work is​ they take in the hot air outside, cools it off, and then spits it back out. The condenser is primarily responsible for this. Once the condenser coils inside the condenser get dirty, they start to fail at cooling off the air.

Evaporator coils are the secondary coils that this cool air will pass through. These coils can also get dirty. However, since the air that is blowing on these coils is already cold, the dirt on the evaporator coils can easily freeze over. This build-up can cause a blockage of the cool air and can lead to your air conditioner not keeping up.

A simple fix to both of these problems is to unplug your air conditioning unit and clean them. Using a wet cloth and possibly some coil cleaner solution, you can get rid of the dirt and debris that would affect your AC negatively.

Check Those Evaporator Coils


Another common issue that can cause your air conditioner to not keep up with your thermostat is a leak. Most new AC units do not require a freon charge. This may be the case for you. If no cold air is being blown out, it may be due to lack of freon. However, it can also be due to a refrigerant leak. If your fridge is not keeping up, this can be the problem. In the case that your refrigerant is the issue, your AC may stop working completely.


Sometimes, your thermostat may be the culprit. The AC is designed to cool air to the temperature set on the air conditioning unit. However, if your thermostat is malfunctioning in any way, you will not get the cold air that you want. As with a meter device, getting a professional electrician to check in and replace the thermostat is suggested.

Another tip is to try and keep your air conditioner on as much as possible. This way, it has a better chance of cooling once a heat wave comes in. You do not always have to have it on or even set at a low temperature. However, having it already set to go does help increase the coldness efficiency of the AC unit.

Meter Device

There are a few components in your AC unit that can malfunction and cause your air conditioner to not keep up. The meter device inside is one of these. Checking whether or not the meter device is working can help solve your problem. If the meter device is malfunctioning, you will need to contact a professional electrician to help get a new meter device installed. However, faulty meter devices are rare.


Fan Motor Malfunction

Sometimes the fan motor inside of your AC can malfunction. If it does, that will result in your compressor overheating. This will of course cause your air conditioner to not keep up with its thermostat. The issue with this problem is that it can be hard to notice. Your motor can overheat and then start working again and then overheat again. This can cause your air conditioner to sporadically keep up with the thermostat.


There are many different reasons your air conditioner not keeping up with thermostat. Finding which specific issue that you are facing can be difficult since there are different causes for it. Nevertheless, identifying the problem can be done. Once you do so, fixing your air conditioner should not be difficult. Check out how they work if you need more info!