šŸ’ø The AI Side Hustle: How I Would Use ChatGPT + Lindy to Sell Services to HVAC Bros in Berlin

Lindy

This is a low-effort, high-potential side hustle I accidentally stumbled on… and now I’m sharing it before I turn it into a ā€œmasterclassā€ and charge $997.

Here’s the deal:

You can use ChatGPT to find real leads (like HVAC companies, plumbers, dentists), organize them into a table, and start cold emailing them your offer.

Then, to scale it? You throw in Lindy, the AI assistant that does 80% of the grunt work for you. While you nap, eat, or do literally anything else.

Let’s break it down.


🧰 Step 1: Use ChatGPT to Get Free Leads

šŸŽÆ The Prompt:

Just copy/paste this into ChatGPT:

ā€œGive me a list of 10 air conditioning companies based in Berlin. Include their name, website, and email address. Organize the info into a markdown table.ā€

šŸ” Repeat this for:

  • Other cities (Hamburg, Munich, Stuttgart… go global!)

  • Other industries (plumbers, gyms, dentists, dog groomers)

šŸ’” Want more leads per run? Just change it to ā€œGive me a list of 20ā€¦ā€
Want niche B2B? ā€œGive me a list of commercial HVAC companiesā€¦ā€


šŸ“Š What You’ll Get:

Lead Gen

Once you get that sweet table of prospects, you’re officially in business.


šŸ“© Step 2: Write a Killer Cold Email

This is where most people overthink it. Don’t be that guy.

Keep it short, personal, and valuable.

āœļø Copy-Paste Cold Email Script:

Subject: Quick win for your website

Hi [First Name],

I came across your business, [Business Name], while looking for local HVAC pros in Berlin. Your site looks great — but I had a few ideas to help you get even more local leads.

I specialize in helping companies like yours improve visibility with simple SEO and Google Business tweaks. Would you be open to a quick 10-minute call next week?

Best,
[Your Name]
[Your Website or LinkedIn]


šŸ’” Pro Tip: Personalize the first line! Use ChatGPT again:

ā€œWrite a friendly intro line for a cold email to ā€˜KlimaKƶnig GmbH’ based on their website.ā€

Now you’re doing high-touch cold outreach… at scale.


šŸ¤– Step 3: Automate It with Lindy (The Fun Part)

Lindy is your virtual assistant that can do the WHOLE process on autopilot. No more copy-pasting like a caveman.

šŸ› ļø Lindy Setup (Step by Step)

  1. Sign up at Lindy and get to know it!
    (It’s free to start, no stress.)

  2. Create a new ā€œAssistantā€
    Call it something fun. Like ā€œLead Hustler 3000.ā€ 

  3. Give it these instructions:

“Every day at 9 AM, search for 10 HVAC companies in a selected city (e.g. Berlin), gather their name, website, and email, and put the results in a Google Sheet. Then, generate a personalized cold email using the provided script. Send the email via Gmail to each contact.”

  1. Connect these tools:

    • Gmail (to send emails)

    • Google Sheets (for storing contacts)

    • ChatGPT API or built-in AI (for writing)

    • Optional: Zapier or Make.com if you want to expand this beyond Lindy

  2. Schedule the workflow
    Run it every morning, or even better — trigger it manually when you want to hit a new city or niche.


šŸš€ Advanced Hustle Tips

  • Want to go full agency? Use this to get SEO/web/social media clients.

  • Offer your service as a monthly subscription — $250/month for ā€œlocal visibility optimization.ā€

  • Upsell them on:

    • Google Business optimization

    • Site speed fixes

    • Review generation

  • Use ChatGPT to write reports and monthly check-ins automatically.


šŸ’„ TL;DR — The Lazy Lead Gen System

  • Use ChatGPT to find 10-20 leads per city, per niche

  • Drop that into a table

  • Use the cold email script to pitch your services

  • Automate everything with Lindy (or Zapier if you’re spicy)

  • Charge monthly, scale globally

  • Eat tacos while your AI assistant hustles for you


 

About the Author

DJ

Founder & CEO / passionate to write about innovation, startup, biotech and bioeconomy. Interested in AI, SEO, copywriting and breeding unicorns šŸ¦„šŸ¦„šŸ¦„

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