The overflow answering plan you buy in May is the one that saves August
Peak demand and peak understaffing arrive in the same week, and unanswered rings are the single most expensive leak in this trade.
Pull the call records for the worst stretch of last summer and count the calls nobody answered, plus the ones answered after a long hold. Most shops have never looked, and the number is usually worse than the owner expects.
Answer rate is a staffing decision made months earlier. An overflow service, a second trained person on the phones during peak hours, or a rotation that moves someone off dispatch into intake all cost real money, and all of it is less than the work walking away.
Test what the after hours service actually says. Call it at eleven at night from a phone nobody recognizes and listen to the whole thing. The script is often years old and promising something the company no longer does.
Web forms deserve the same scrutiny. A form submitted at four in the afternoon that gets a callback the next morning is competing against whoever picked up the phone in the meantime.