I thought about why people think that air conditioner electricity bills are so high

As was the case yesterday, except for those of us who are considering energy conservation,
I think many people still think that the electricity bill for air conditioning is high.
This is not particularly unusual, and most people probably feel this way.
I think you have an image or a preconceived notion.
Regarding the person from yesterday, "I thought air conditioning was expensive, so
I tried to use oil heaters and heated carpets."
They were making efforts that were the exact opposite of saving electricity.
I don't think this is even particularly unusual.
So why has this image become so established?
I've thought of a few reasons why.
First of all, people have a tendency to hold on to the image they have formed.
It is also true that in the past, COP was much worse than it is now, as shown in the graph below.

This table is from 2004, so it fits in at about 5, but if you're using the latest model,
It has reached 7. The actual COP is usually about 70% of the catalog value.
When the COP was around 1.5, the actual COP was the same as that of an electric heater.
Moreover, as is still the case today, there were almost no well-insulated houses at that time.
Even if the same amount of heat is being taken, it is difficult to feel warmer with an air conditioner that only heats the air inside the room.
It was not possible to do so, and as a result the temperature had to be set quite high.
You can imagine that this would have cost much more than an electric heater.
I think this is still true today. In my experience, the Q value exceeds 4.2.
In homes that do not meet the old energy conservation standards, it is not possible to feel warm using only air conditioning.
I think it's almost impossible. The temperature difference between the top and bottom is large, and the cold radiation from the windows is also a problem.
The floor is also cold. In this condition, if you try to achieve a sensible temperature of 20°C,
The room temperature must be brought up to nearly 30 degrees Celsius.
The COP may be offset, and the air conditioner alone may not provide enough heat.
You probably won't even realize it.
This is because many ordinary people experience it, and in low-performance homes, the radiation environment is locally
Hot carpets, electric stoves, kotatsu, oil heaters, etc. are used in combination to improve the environment.
In that sense, I think that people who build low-performance houses are more likely to find ways to improve things.
It can be said that ordinary people are more wise than others. At the same time, it is also clear that most Japanese homes are of low performance.
This is also an example that shows how this is the case.
The reason why underfloor heating is so highly touted is because the insulation is weak and without underfloor heating it would be difficult to live comfortably.
This is the same as saying, "Our houses are of low performance!"
On the other hand, it is an air conditioner that can perform heating, cooling, and dehumidification with the highest efficiency yet is inexpensive.
In order to make the most of the wonderful equipment that Japan boasts, the house should be more than just a next-generation energy-efficient one.
You could also say that there is.
So, my final advice is for those who live on the middle floor or in the middle room of an apartment building.
Among those who have lived in a house built by a major housing manufacturer within the past 10 years, or had their house built by a construction company
People who built houses in places that were selling next-generation energy-saving standards are now relying solely on air conditioners.
I think you can reduce your utility bills by doing this. If this is the first time you've heard of it, I highly recommend you give it a try.
Finally, on a separate note, the Building Fuel Efficiency Navi study group was featured prominently on the cover of the latest issue of Shinken Housing.
It was introduced. We plan to hold similar information sessions and circles all over the country in the future. Stay tuned!