When Zhang Anan saw His Majesty ask this question, he immediately stepped forward with a smile to promote his product.

"Your Majesty, this item only costs three coins to make!"

"Three coins?"

Li Shimin almost jumped up when he heard this.

"Three coins isn't expensive, how much does a bushel of rice cost?"

"Your Majesty, don't you even see how heavy this thing is!"

"A honeycomb briquette weighs at least four pounds, yet it only costs three coins. Isn't that much cheaper than charcoal?"

"Oh, if you put it that way, this item isn't really that expensive."

"Then I will purchase 100,000 honeycomb briquettes to replace firewood and charcoal!"

"By the way, pass down the order to have all levels of government offices in the capital replace charcoal with honeycomb briquettes!"

"This servant obeys the decree!"

Zhang Anan ran out happily, but he hadn't gone far when he saw Li Jue waiting for him.

"How's it going, Uncle Zhang? Has my uncle agreed to buy honeycomb briquettes?"

Zhang Anan smiled slightly at Li Jue.

"Done!"

"His Majesty ordered the palace to purchase 100,000 briquettes, and also sent me to instruct all levels of government offices in the capital to replace all charcoal with honeycomb briquettes, hehehe!"

"Eldest grandson, aren't we rich now?"

Li Jue nodded happily upon hearing this.

"I'm rich!"

"As long as the imperial palace and all levels of government offices in the capital use our honeycomb briquettes, the people of the capital will follow suit. Chang'an has a population of over a million, consuming at least hundreds of thousands of briquettes a day. Even if each briquette only costs three coins, the total amount over a year will be astronomical, hahaha!"

Just as the two were happily discussing their money-making plans, Li Er's sinister voice suddenly came from behind them.

"OK!"

"You two actually conspired to swindle my money!"

Upon hearing this, Zhang Anan was so frightened that he knelt down with a thud, while Li Jue turned to run away. However, this time Li Shimin was prepared and grabbed him back.

"Trying to run away!"

"Grandpa, please calm down. Your grandson didn't mean to run away, hehehe..."

"Get over here now!"

"Oh oh oh..."

Seeing His Majesty carrying his eldest grandson back to Ganlu Palace, Zhang Anan couldn't help but ask a question timidly.

"Your Majesty, shall I go and deliver the imperial decree?"

"go!"

Upon hearing this, Zhang Anan immediately understood that His Majesty was not angry, but was just joking with his eldest grandson. He then happily ran off to deliver the imperial decree.

Li Shimin carried Li Jue back to Ganlu Hall and pointed to the five stoves inside the hall.

"You figured all of this out yourself?"

"yes……"

Why doesn't this thing emit smoke?

"Reporting to you, sir, this item is first washed to remove impurities, and then mixed with clay, saltpeter, and other materials and pressed into this special shape to eliminate the smoke."

"Oh, oh, oh."

"This thing is definitely harmless to humans, isn't it?"

After a slight hesitation, Li Jue decided to tell the truth.

"It's hard to say!"

"Grandpa, actually this thing is just like charcoal. Even if you can't see smoke when it burns, carbon dioxide will still be produced..."

"carbon dioxide?"

"Sigh, you don't need to know what carbon dioxide is. You just need to know that burning too much charcoal indoors will make people feel stuffy."

"The same goes for this thing; if too much of it is burned in a closed room, it can still suffocate a person."

"Therefore, it is important to ensure proper ventilation."

"It would be best to build a stove and use a chimney to vent the excess smoke out."

"Oh oh oh!"

Upon hearing this, Li Shimin immediately recalled the heating system he had seen at the Jinghu Villa in Xianyang.

"By the way, could you please bring the heating from Mirror Lake Villa to the palace?"

"This..."

“Grandpa, that thing is very expensive. It would cost several thousand strings of cash to use at Mirror Lake Villa. If you wanted to use it in the palace, it would probably cost no less than a million strings of cash.”

"So expensive?"

Li Jue nodded upon hearing this.

"This is just the initial installation cost; the subsequent maintenance and upkeep will be much more troublesome."

"this……"

When Li Shimin heard that it would cost so much money, he immediately felt a pang of heartache.

"Then let's put it off for now and build a Lizheng Hall for you and your aunt first."

"Your aunt has a breathing problem and can't stand the smell of smoke!"

Li Jue was secretly moved upon hearing this, never expecting that Li Er would actually care so much about Si Zi and himself.

"Grandpa, why don't we install a set in your Ganlu Palace as well?"

"As long as it's not for the entire palace, but just for one or two palaces, it doesn't actually cost much."

"oh?"

Li Shimin was very tempted by the offer, but he declined because he was also responsible for promoting honeycomb briquettes for this grandson.

"I won't need it for now; this stove is enough for me."

"By the way, how much did this iron furnace cost?"

"Reporting to Grandfather, this stove is a bit expensive, it costs one string of cash..."

"A string of cash..."

Li Shimin thought for a moment and then said.

"The people of Chang'an are wealthy, and they should be able to afford it with one string of cash. Let's sell it at that price!"

"promise!"

"Grandpa is wise! I never intended to make money from the stove. As long as the people of Chang'an use honeycomb briquettes, I can make a fortune! Hahaha!"

Li Shimin frowned slightly upon hearing this; he hated this grandson's mercenary look the most.

"You haven't been reading lately, have you?"

"ah?"

Upon hearing this, Li Jue felt a chill run down his spine. Sure enough, Li Shimin then threw a book at him.

"I have a collection of poems here. I'll give you the morning, and I'll personally test you this afternoon."

"Even a single wrong word!"

At this point, Li Shimin pointed to the roof beams of the Ganlu Hall.

"I'll strip you naked and hang you from the rafters to beat you!"

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