While. Avoid the indiscriminate use of this word for and, but, and although. Many writers use it frequently as a substitute for and or but, either from a mere desire to vary the connective, or from uncertainty which of the two connectives is the more appropriate. In this use it is best replaced by a semicolon.
| The office and salesrooms are on the ground floor, while the rest of the building is devoted to manufacturing. | The office and salesrooms are on the ground floor; the rest of the building is devoted to manufacturing. |
Its use as a virtual equivalent of although is allowable in sentences where this leads to no ambiguity or absurdity.
While I admire his energy, I wish it were employed in a better cause.
This is entirely correct, as shown by the paraphrase,
I admire his energy; at the same time I wish it were employed in a better cause.
Compare:
| While the temperature reaches 90 or 95 degrees in the daytime, the nights are often chilly. | Although the temperature reaches 90 or 95 degrees in the daytime, the nights are often chilly. |
The paraphrase,
The temperature reaches 90 or 95 degrees in the daytime; at the same time the nights are often chilly,