"Coolhouse" is a fun and catchy term used to describe a stylish and modern residence, but there are several other synonyms that can be used to describe such a house. For example, a "chic abode" or a "fashionable dwelling" would convey a similar meaning. Another option could be to use words such as "sleek" or "sophisticated" to describe the house's design. Additionally, using words such as "trendy" or "contemporary" would evoke a similar image in the reader's mind. Ultimately, there are numerous synonyms that can be used to describe a coolhouse, and the choice of words will depend on the writer's personal style and the tone of the piece.