In high-performance homes, whole-house cooling is incredibly efficient!

In high-performance homes, whole-house cooling is incredibly efficient!
A single air conditioner is installed in the attic to cool the entire house, mainly on the second floor.
It has been almost two years since I started using this method, and in the second summer
Now that we have arrived, we have come to understand quite a few things.
With this method, we recommend leaving the air conditioning on 24 hours a day if possible.
You might be thinking "What a waste!" but that's not the case at all.
Many people have solar power generation, so if you are particular about it, you can check how much power your air conditioner consumes.
It will report on the progress of the results. I have collected several results, and on average,
It seems that most of the time, they consume around 200W to 250W of power.
By the way, the rated cooling power consumption of an air conditioner for a 6-tatami room is 450W, so 200 to 250W is
This is equivalent to the power consumption of about three tatami mats according to electrical appliance manufacturers.
The home of the client who contacted us today is 32 tsubo, or the equivalent of 74 tatami mats, so it is 1/20 of the tatami mat size.
This means that the entire house is being cooled gently.
Considering that this house uses the standard A-type electricity plan that is common in the Kansai region,
1kW = approximately 26.5 yen.
0.2KW x 24 hours x 26.5 yen = 127 yen/day, which comes to a cooling cost of 3,810 yen/month.
For those who have signed up for the all-electric Happy Plan
0.2kW x (8h x 10.5 yen + 16h x 32.5 yen) = 121 yen/day, or 3,630 yen/month.
Is this expensive?
Even in homes with poor performance, where the air conditioning is only used when you are in the room, the cooling bills are higher than this.
I think it's mostly houses.
Moreover, this method is not only comfortable, but because it is not a direct cooling system, you won't feel tired in the morning even if you keep it on all night.
In addition, the humidity is kept at about 60%, so the occurrence of mold and dust mites is extremely rare.
It is very hygienic and reduces the chances of contracting various diseases.
I don't do it, but I think it would be incredibly valuable if you tried.
So how is this possible?
First of all, in ordinary houses, the eaves are not properly designed, the heat-insulating glass is not used, and the size of the windows on the east and west sides is not properly designed, so strong direct sunlight enters the house.
In addition, because the roof and walls have low insulation, heat penetrates through them.
The initial conditions are so hot that they consume a lot of electricity for the first hour or two after they are switched on.
It is the combination of these factors that leads to these kinds of differences.
Even if our customers refuse to use air conditioning and live with mold, dust mites, and heat,
The savings would be just under 4,000 yen.
Over the course of a day, that comes to just 130 yen, or the price of a can of juice.
Even with all this, do we still dislike air conditioning and hope for barely any ventilation?
It may be possible in a cool place surrounded by rice fields and mountains, but in a residential area, it seems unreasonable.
I think so.