However, Hu Changan didn't know the twists and turns in Sun Yi's mind.

Hu Changan just calmly picked up the pen and drawing tools and drew on the paper.

Soon, a draft of the warm wall took shape.

This is a type of warm wall structure that was very popular in the Qing Dynasty.

Make two layers of walls, the inner layer is hollow.

The hollow part can be connected to the outer furnace.

As long as the stove is burning, the air inside the hollow wall is heated, and the heat is continuously dissipated.

When the walls are warm, the interior is naturally warmer.

And it's so warm and even.

Things like air conditioners and stoves, after all, can only warm a small area.

Only by relying on air circulation can the whole area be warmed.

Therefore, sometimes when the indoor air is not well circulated, the problem of uneven heating will occur.

It may be warm next to the stove, but it can be shivering away from the stove.

Warm walls don't have this problem.

No matter where you are in the room, it will be warm like spring.

Seeing that Hu Changan had already finished painting, Sun Yi leaned over to see what kind of ghost Hu Changan had drawn.

As an old craftsman, he has seen too many cows, ghosts, snakes, and gods.

There are not many Hu Chang'an, and there are many Hu Chang'an.

He seemed to have been able to anticipate the tragic situation drawn by Hu Changan.

However, it was just like this, Sun Yi was completely stunned.

I saw that on the paper, the design drawings were neatly drawn!

With Sun Yi's vision of building a house for many years, this drawing can definitely be used!

Sun Yi couldn't help but be interested, and hurriedly stepped forward to take a closer look.

However, it was this look that Sun Yi was completely stunned.

The design of this warm wall is so ingenious!

Sun Yi has built a house for many years, and he can't imagine such a wonderful design!

As long as you put a fire in the stove, the house will naturally heat up.

And thanks to the design of the independent flue, the smoke from the stove is discharged directly to the outside and does not accumulate indoors.

This means that if you are indoors, you can enjoy the warmth of the room anytime and anywhere as long as you let the people outside set up a stove!

After being stunned for a moment, Sun Yi couldn't help but praise: "Master Hu, I don't know how you came up with such a subtle design?" Even if you want to break your head, you can't think of it! ”

Seeing this, Hu Changan also smiled slightly and did not say much.

Before Sun Yi's team arrived, he had already redeemed the building guide in the system.

Hu Changan's hand, but he traced it several times according to the architectural guide before it could be successfully reproduced on the spot.

Sun Yi was moved, and a bold idea slowly formed in his mind: "Hu Gongzi, I don't know your plan for the construction of this warm wall, can I recommend it to others?" ”

The keen Sun Yi has already seen business opportunities in it.

With such an ingenious warm wall, which noble family doesn't want to have it in winter?

If he could extend this method of warm walls to the entire Yingtian City, then he would definitely be able to make a lot of money!

However, Hu Changan ruthlessly broke Sun Yi's illusions: "Craftsman Sun, you want to recommend this plan, you can." ”

"But you have to introduce it to others, this is the recipe I Hu Changan came up with."

"And for every warm wall you build, you have to pay me a certain fee."

Just kidding, Sun Yi can think of this, can't he Hu Changan think of it?

Hu Changan will never let go of this piece of fragrant bread.

First, this can enhance Hu Changan's reputation in Yingtian City.

If all the nobles of the family use the warm wall invented by Hu Changan, then in their hearts, they will naturally have a little more affection for Hu Changan.

In the future, above the court, even if they may not take the risk to support Hu Changan, at least they will not fall into the trap or deliberately harm Hu Changan.

In this way, Hu Changan has an extra guarantee above the court.

Second, this is also a way to make money!

In later generations, what else is there to say about design fees and patent fees, Hu Changan is not allowed to charge some fees for this invention.

No matter how small the mosquito legs are, they are still meat, and when they add up, they will definitely be an objective income.

And Sun Yi thought for a moment and agreed to Hu Changan's proposal.

Although Sun Yi may have to pay some money in the future and help Hu Changan publicize it, this is definitely a first-class beauty for Sun Yi.

Generally, families build houses, but they are built in pieces!

People like Hu Changan, who only build one house, are still a minority after all.

The families are not bad for money, if they knew that Sun Yi had such a comfortable winter warm house here, they would definitely give priority to Sun Yi to build a house.

In this way, Sun Yi is not making money from a house, but from a house!

With so much income, what does it matter if Hu Changan is paid a little?

As a result, Sun Yi and Hu Changan happily reached a consensus.

And in order to show the sincerity of cooperation, Sun Yi also said that Hu Chang'an's room, he did not accept a penny!

After all, in Daming, building a house is not as much as the cost of later generations.

The land and the house, that were bought separately.

Buying land is the big deal.

Bought land, the money to build a house on it is only a small head, and it will not be too much.

Even if Hu Changan built a brick house this time, the bricks were all built of clay!

Clay is not just a casual dig in the ground, as long as there is a shovel.

So the cost of building a house is really not too expensive.

Seeing this, Hu Changan also happily accepted Sun Yi's suggestion about being free.

After all, there are free houses to build, and who is not happy?

Although Sun Yi and the others have no money to get, they work very hard.

As the saying goes, science and technology are the primary productive forces.

Thinking that they would be able to make a fortune in the future with this craft of building a warm wall, they naturally worked extremely hard.

With the hard work of all the craftsmen day and night, in less than a month, Hu Chang'an's greenhouse took shape.

Hu Changan hurriedly ordered someone to add honeycomb coal to the furnace outside.

Soon, as the honeycomb coal burns, the room slowly becomes warmer.

Although it was late autumn at this time, it was still warm as spring in the small house!

Hu Changan is inside, and even as long as he wears spring clothes, he can move freely.

And Sun Yi was also very emotional when he saw the situation when this greenhouse was in use.

Originally, Sun Yi only saw it on the drawings, but he didn't intuitively feel the magic of this warm wall.

Now that I have experienced it myself, it is really extraordinary!

It's a miracle that can reverse the seasons!

At this moment, Hu Changan and Sun Yi were very satisfied.

Seeing that the house had been completed, Sun Yi also said goodbye to Hu Changan and prepared to continue to work at the next house.

And Hu Changan also touched his chin, ready to invite someone to visit his new house.