What size should I choose for my air conditioner? Before facing this question, you may still have a doubt: what does "1 HP" air conditioner represent? Today we will discuss these two issues in depth.

# The "p" and "w" on the air conditioner

When we go to the mall and ask the guide: How big is this air conditioner?

You'll probably hear two answers: "It's a 1 horse" or "It's a 26". Both of these statements are true, but the latter is more standard.

First of all, phi: phi refers to 1 horsepower, and the relationship between phi and watt is "1 phi = 735.5 watts". The air conditioner will blur this number and consider about 800w as 1 horsepower.

When "hp" is used as a unit in air conditioners, it generally refers to the input power of the air conditioner, which is the power consumption.

Back then, the technical level of air conditioning was relatively poor, and there was no concept of efficiency. The more you eat, the more work you do. So the greater the input power, the greater the output power.

So there is a convention: each horsepower input power, corresponding to 2600w output power.

But it is clear that in today's environment, where there are high and low product efficiencies, this argument is outdated.

The more popular term today is "so-and-so": the "so-and-so (number)" here refers to the thousands and hundreds digits. For example, 26 type, refers to the power of 2600w (the actual designation is rather vague, the power of about 2600w are called 26 type).

When the air conditioner is "type" as the "unit", it refers to the output power (cooling capacity) of the air conditioner. We choose the size of the air conditioner, not to see how much food it eats, but to see how much work it can do. So "so-and-so type" this statement, more practical and more formal.

In the formal occasions of air conditioning, or formal advertising, you can hardly see the "phi", are saying "so-and-so type".

PS: Inverter air conditioners also say "this is how many horsepower". But in the inverter air conditioner, it is "2600w output power corresponding to 1 horsepower input power" backwards. In reality, if you look at its input power, it does not reach 800w.

Therefore, in inverter air conditioners, "phi" is redefined as 1 phi = 2600w input power - a definition that can only be applied to inverter air conditioners.

# Air Conditioner Size Influencing Factors

There are three factors that influence the choice of air conditioner size.

1. room area, the larger the area, the larger the air conditioner should be.

2. insulation situation, west sun, roof, no external wall insulation layer, etc., will affect the room insulation effect, the choice of air conditioning should also choose a slightly larger.

3. closed situation, such as the bedroom, is relatively closed. But the living room, often the living room, dining room, hallway together. This room, it belongs to the open room. Open room, you should also choose a larger air conditioner.

4. heating needs, that is, whether you need to rely on the air conditioning heating in winter. The heating effect of the air conditioner will be worse than the cooling effect, so if you need to use it for heating, you need to buy a larger one.

# Selection of air conditioner size

First of all, a basic figure is estimated according to the room area: 150w cooling capacity per square meter is required.

For example, a room of 15 square meters requires a cooling capacity of 150x15=2250W, which is a 23-type air conditioner. The smallest air conditioner on the market is the 23 type, and for rooms under 15 square meters, you should choose the 23 type.

Look at the other cases mentioned earlier: insulation/closure/heating needs.

For each situation encountered, add 30W/sqm to the base cooling capacity.

For example, for a 15 square meter living room, you need 180x15=2700W, or 27 type air conditioners - there is no 27 type on the market except 26 type or 28 type, what if there is no 27 type?

There are a few words in air conditioner shopping, "buy big, not small". So we have to go up one step and choose 28 models.

What to do with this same 15m2 living room, again encountering the top floor? The answer is to add two 30w, and the cooling capacity requirement per square meter becomes 210w.

The size of the air conditioner needed for a 15 m2 living room on the top floor is 210 x 15 = 3150 W. Therefore, we have to buy a 32 type air conditioner.

The same is true when the insulation is poor and there is a demand for heating. For each kind encountered, add 30w.