Corey Mullins
HVAC tradesman-turned-entrepreneur who started Cool By Design and acquired a small legacy HVAC business, then grew and sold the combined company to a private equity platform for $3.25M in under four years.
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Mar 26, 2026 • 1h 27min
Turning $25k into a $3.2m Exit in Under 4 Years
Corey Mullins, an HVAC tradesman-turned-entrepreneur who founded Cool By Design and bought a legacy HVAC shop, tells his $25k to $3.25M build-and-exit story. He discusses buying a failing business for its phone number and truck. He covers growth via online marketing, hiring mistakes, building-to-sell financials, and choosing private equity over searchers.
