I was so excited to see the Jacuzzi size bathtub because I do n't have a bathtub at my house . Since it was about 40 degrees ( Remember that Mark Twain quote about the " coldest winter I ever spent was a summer in San Francisco " ? Turns out , it 's true .

Question: Why did the narrator opt for a Jacuzzi at their house ?
Answer: Mark Twain recommended one .They wanted to emulate Mark Twain 's house .They live in a hot environment .San Francisco is cold .