Facing a seasonal dip in high-quality leads, HVAC provider Comfort Systems launched a targeted email campaign to re-engage its customer base. The single, modular email deployment was designed to drive both immediate service bookings and long-term replacement estimates. The campaign achieved a 28% open rate and an impressive 4.5% click-through rate, far exceeding industry benchmarks. This translated directly into a 22% increase in qualified service leads within the first two weeks. The "Book Service" call-to-action saw a 3% conversion rate, while the "Request Free Estimate" link generated a significant pipeline of high-value replacement opportunities. Ultimately, the strategic combination of clear service modules, compelling social proof, and a time-sensitive offer revitalized their sales funnel. The mobile-first design and prominent trust badges were key to building immediate credibility and driving action.