# Free 15-Minute HVAC Ad Call with MD RANGA BABU

> A free 15-minute call with Ranga for HVAC owners. Tell me which jobs you want more of and where your crews work. I'll tell you honestly whether Facebook and Instagram ads make sense for your company right now, and what I'd run first.

- Host: MD RANGA BABU
- Duration: 15 min
- Location: Google Meet
- Host time zone: Asia/Dhaka
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/merangababu/hvac-ad-call
- Event type id: 7875729

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7875729&start=YYYY-MM-DD&end=YYYY-MM-DD&timeZone=<IANA time zone>
cal-api-version: 2024-09-04
```

The response is `{"data":{"YYYY-MM-DD":[{"start":"<ISO 8601 with offset>"}]}}`; no API key is needed.

## Book

```http
POST https://api.cal.com/v2/bookings
cal-api-version: 2026-02-25
Content-Type: application/json

{
  "eventTypeId": 7875729,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "What-do-you-sell--and-who-do-you-sell-it-to": "…",
    "attendeePhoneNumber": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `What-do-you-sell--and-who-do-you-sell-it-to` (What do you sell, and who do you sell it to?)
- Optional fields: `attendeePhoneNumber` (Phone number), `notes` (Additional notes), `guests` (Add guests)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.