The no-heat visitor at eleven at night wants one number and an honest answer about tonight
The first screen has to say who you serve, whether anyone is answering right now, and what happens if nobody is.
A house losing heat in January is a different visitor from a house losing cooling in July. The person is usually standing up, holding a phone, deciding within seconds whether to call you or go back to the results.
Put the phone number where a thumb lands and state the after-hours reality next to it. If a service takes messages until seven, say that. Vague promises of round the clock availability produce angry voicemails and one star reviews.
Give the person who arrives outside your hours something to do that works. A short form that gets read first thing, with a plain sentence about when they will hear back, keeps the inquiry instead of donating it to the next contractor.
Skip the slider, the mission statement and the welcome paragraph. Nobody in a cold house reads a welcome paragraph.