Best Air Conditioner – Buying Guide

Summer is coming, and with a summer temperature of 35 ° C, even 40 C °. Last year, before the end of August, we were all on the edge of our nerves – such a dramatic situation is not forecast for this year. Still, it is far from being that there will be no work for the climate.

The air conditioner does not only have to cool – but it can also heat and very efficiently. Therefore, it is a complete product, the procurement of which should be approached carefully. In the next few minutes, we will try to answer some of the most critical questions about buying air conditioners.

What are air conditioners, and what types are there

An air conditioner is a heat pump – which can transfer heat from one place to another. This is possible primarily due to the unique chemical compounds found in them. You’ve probably heard of them – they’re freons.

When the air conditioner cools down, the freon absorbs heat from inside the room and releases it outside. When it heats up, the process is reversed.

Cooling is still synonymous with climate for many, but heating is becoming an increasingly popular option, primarily because of its energy efficiency compared to electric competitors.

These are the basics, and a more profound elaboration awaits those interested in the following text. Now, we come to the part where we talk about the middle ground. So what types of climates are there?

Standard and inverter air conditioners

Climate inverters consume significantly less, which is their primary but not the only advantage. The main advantage of standard ones is that they are considerably cheaper.

Standard climates always run at full power. When they reach the temperature, they stop and turn on again when the sensor says it should. And they are doing all this with full force. The inverter is more intelligent. It can recognize that it is close to the set temperature and reduce the intensity of work accordingly – that is, it works as it should.

This means not only lower costs – but also a more uniform temperature. Standard models make much larger amplitudes than inverters, making the atmosphere more excellent and more pleasant. Inverter air conditioners are less noisy, and another essential thing is that they can work at much lower outdoor temperatures than standard ones. The mentioned advanced SEER and SCOP classification is also applied to them. They reach the set temperature faster and are longer lasting.

Both types are split systems – a recognizable variant where you have an indoor and outdoor unit. Also, both species rotate the indoor air, which only takes away or adds heat.

In conclusion, standard air conditioners are quite a respectable device. It would help if you understood things. Simple – inverter is a major league.

Mobile climates

Mobile air conditioners or portable air conditioners have wheels so that you can move them from room to room.

Since, just like the windows, they are not a split system, everything is in one device that looks like a giant suitcase. They have a hose that blows out hot air, and you have to carry it somewhere. One option is through the window, but a better option is in the chimney if you can.

They are not exactly champions of energy efficiency or quiet work. This device is used if you are in a specific situation so that you cannot reach for the installation of a classic split system.

Window climates

Window climates are similar to mobile environments in that it is also all in one box. Unlike split systems, they let in fresh air from outside the room.

They are not mobile but can be relocated more easily than split systems. They are installed in the window and come already filled with gas. In principle, you can install them yourself if you are a little more skilled at home, unlike split systems where independent attempts are not recommended. They are noisy at work.

How much capacity is needed?

The primary item is, of course, the size of the space: larger room – more robust climate, and vice versa.

This is a rough calculation:

  • Room from 20 to 35 square meters – capacity of 9000 BTU.

BTU is otherwise a label for climate capacity. The abbreviation means “British thermal units.” Let’s not get into the story of why this measure is used. That’s it. Also, in the jargon, for the device of 9000 BTU, it is said: “nine,” “twelve” for 12000 BTU, and so on.

To continue, the room from:

  • 35 to 60 square meters – capacity of 12000 BTU
  • 60 to 80 square meters – capacity 18000 BTU
  • 80 to 110 square meters – capacity 24000 BTU

Why do we say roughly? Because, of course, there are a few more factors. Sun exposure, the size of the windows, the number of people present, whether you may have some devices in the room that emit heat significantly, and the like.

But this is a good starting point. Most people generally live in rooms that are subject to average conditions. If you have a specific situation, think about it and try to adjust this basic calculation.

Power consumption

The following data are essential here: energy class, EER, and COP, as well as SEER and SCOP.

EER and COP are the coefficients of cooling and heating efficiency, respectively. They indicate how much cooling or heating energy you get for 1 W of electricity. So, 3 W of cooling energy for 1 W of electricity gives an EER of 3.0. Accordingly, 3 W of heating energy for 1 W of electricity means a COP of 3.0.

SEER and SCOP are the same, only calculated better. Namely, EER and COP are calculated according to a fixed parameter, at this and that external and set temperature and humidity. SEER and SCOP consider different situations during a typical year (i.e., season, hence S in the name) and represent a more advanced quantification.

And the energy class is nothing but the systematization of all these numbers. (S) EER and (S) COP in some ranges give energy class B. Well, in some other class A and so on.

So, things are pretty simple. The bigger the numbers and the closer the letters to the beginning of the alphabet, the better.

It is important to emphasize that no climate, no matter how energy-efficient, will help with the electricity bill if you keep it on all day. Rational spending is the primary condition for thinner accounts, which is already up to you.


Why is air conditioning an excellent and economical heating option? Because it’s a heat pump, not a heater.

Of course, the consumption of electricity in climate work does exist. But that extra moment, that heat from the outside air that the freon “takes” and adds inside, that’s what the air conditioner emits in terms of energy efficiency.

Air conditioners cannot heat when the temperature drops below a specific limit. Partly because of the physical limitations and icing of the outdoor unit, partially because their efficiency certainly decreases with each lower division.

As strange as it may seem, the outside air has heat to absorb, even at serious disadvantages. However, as the temperature drops, so does the effectiveness of this principle.

But in the conditions of our climate, this is not such a problem. We enjoy relatively mild winters, where we don’t even see too many days below zero. Above zero temperature should be a fairly reliable source of heat. Below that, you need to be prepared for a specific performance supplement.

Additional functions and features

Depending on the model, you may come across different options in addition to the primary job of cooling and heating.

Timers, the presence of certain specific filters, sleep mode where the work is adjusted for a good night’s sleep, ionizer, or say, a function called by the manufacturer and requires the device to target the sensor remotely to achieve a set temperature around it.

These are just some of the accompanying features. The climate has not been bypassed by universal connectivity – Wi-Fi or Wi-Fi ready (no Wi-Fi, but you can install it) options are present in models from a higher price range. Of course, everything is accompanied by appropriate applications for control and monitoring of the device.

Cooling and heating remain critical, but additional options can increase the comfort of use. Imagine a scene where you return by car from work and turn on the air conditioning on your mobile phone at a traffic light near your house. You finally arrive, and you are not greeted by a tropical atmosphere but a pleasant freshness.

The working principle

So, we have already determined that the air conditioner does not produce cold but manipulates heat.

Freon is constantly circulating between the indoor and outdoor units. When he goes inside, he is a liquid. Then it comes to the evaporator part. It buys warm air from the room and turns it into gas.

As it becomes gas, it goes to the outdoor unit, first in the compressor, which increases the pressure and thus the different temperature. It then goes to the condenser, where the incoming high-pressure gas cools and turns into a liquid, releasing the accumulated heat through the outdoor unit.

The liquid enters the indoor unit again through a special valve that reduces the pressure, and the cycle is repeated as long as necessary.

Everything works the same when it comes to heating mode – just the opposite. The evaporator becomes a condenser and vice versa. The compressor remains an intermediary between the two elements.

The market is dominated by Asian brands – Korean LG and Samsung, Chinese Gree, Midea or Galanz, and Japanese Daikin. Take a look at this exciting model –Midea 12,000 BTU U-Shaped Smart Inverter Window Air Conditioner, Ultra Quiet With Open Window Flexibility, Works With Alexa/Google Assistant, 35% Energy Savings, is even more considerate of nature. You will agree that it is an excellent and environmentally friendly choice for cooling off on hot summer days.

On the Amazon site, you can find very favorable climates, those mentioned above, and many other brands, even if you are limited by budget. One thing is for sure – the offer is extensive, and you will indeed find the best and most favorable climate for your home.