HVAC's AI Voice Receptionist Development

AI Receptionist & Voice Agent for HVAC Business (n8n + ElevenLabs + OpenAI)
I am looking for an experienced AI Automation Developer to build a production-ready AI Voice Receptionist for a US HVAC company.
The AI should answer inbound calls 24/7, sound natural, and automate customer interactions from start to finish.
Required Features
Answer incoming phone calls with a human-like voice
Schedule new appointments
Reschedule existing appointments
Cancel appointments
Handle emergency HVAC requests
Qualify customers before booking
Answer FAQs using a knowledge base
Handle objections naturally
Transfer calls to a human when necessary
Send SMS confirmations
Email confirmations
Sync appointments with Google Calendar
Store customer information in a CRM or Google Sheets
Call recording and conversation logs
Tech Stack
n8n
ElevenLabs Conversational AI
OpenAI GPT-4.1 or GPT-5
Twilio (Voice & SMS)
Google Calendar API
Google Sheets / Airtable / CRM
Webhooks & APIs
Deliverables
Fully working n8n workflow
Complete source files
Prompt engineering for the AI agent
Documentation
Setup instructions
Error handling and fallback logic
Testing before delivery
Experience Required
Please share:
Previous AI Voice Agent projects
n8n workflows you've built
ElevenLabs experience
Twilio integrations
Similar automation portfolio
Budget
Open to fixed-price proposals depending on experience and quality.
The final solution should be production-ready, scalable, reliable, and easy to maintain. No beginner freelancers please. Only apply if you have real experience building AI voice agents with n8n and ElevenLabs.