The tatami mat measurements shown in air conditioner catalogs are completely unreliable.

Anyone who has studied the thermal environment properly knows this, but
Since there are few people, I think few people know about it.
When you go to an electronics store, there are professional salespeople, but they are not professional in electronics.
Even if I have some knowledge, I am a complete novice when it comes to housing and thermal environments.
In times like these, the tatami mat measurement is a good guide.
That number of tatami mats would be three times as much if it were a new house built by a housing manufacturer.
I don't think that's an exaggeration.
For more details, please read the April issue of Architectural Knowledge, which will be released soon.
So what is that tatami mat number display all about?
I don't recall the way tatami mat numbers are displayed having changed since I entered this industry.
In other words, the tatami mat number system has been carried over from a long time ago when there was almost no insulation.
That's why.
However, old houses still exist, and even when it comes to new construction from housing manufacturers, there is a significant difference in quality.
Even if the same manufacturer and product are used, the area where the building is being built, the location, the placement of windows, the distance to neighboring houses, and the floor plan shape can all vary.
It depends on various other factors.
There are also differences depending on whether the operation is continuous or intermittent.
In these circumstances, we are forcibly allocating the number of tatami mats.
In my opinion, if I just turn up the air conditioner temperature setting to the maximum, I can somehow endure it.
I think the best options would be houses with a Q value of up to about 4.
Even in such a house, it will still work as long as you follow the tatami mat number indications...
I think it's good to think of it that way.
However, from the perspective of electronics manufacturers and retailers, there is a lot of value in the number of tatami mats displayed.
Yes. First of all, machines that are larger than necessary can be sold without any trouble.
And it reduces the chances of complaints after a purchase has been made.
On the other hand, there are disadvantages for the buyer.
Not only will the initial cost be higher, but it will also be larger than necessary.
The equipment will also be less efficient.
Selecting the right air conditioner model is the most difficult aspect of designing an energy-efficient home.
think.