Sentence 1: My old air conditioner was too weak. 
 Sentence 3: It was very powerful 
 Sentence 4:  But it still had trouble keeping me cool 
 Sentence 5:  And I realized how much trouble it is to live in a hot climate 
 Option 1: So I bought a new one. 
 Option 2: I threw it out since the weather was so cool where I lived.