An honest 'Thursday at the earliest' books more work in a cold snap than a maybe
During a deep freeze your constraint is trucks rather than leads, and the shops that keep the work are the ones that tell people the truth on the first call.
What usually happens instead: the phone says today if we possibly can, the customer waits until early afternoon, calls somebody else, and your technician arrives at five to an empty house or a cancellation. You paid for the click, the call and the windshield time.
Give the phone a script that names a real window, offers a firm later slot, and offers a place on a cancellation list. Add the safe things a homeowner can check in the meantime, and a clear instruction to leave and call the gas utility immediately if they smell gas.
Capture the ones you cannot take. A callback list from one freeze week is a replacement pipeline for March, and almost nobody keeps it.
Give the phone visibility of same-day capacity. Dispatchers should not be discovering the board is full at the same moment the customer does.