Free HVAC Tool

HVAC Serial Number Lookup

Pick your brand to instantly decode the age and size of any furnace, air conditioner, or heat pump — then see what it costs to replace it factory-direct and save 40–60%.

21 manufacturers · updated for 2026

Why the age & size matter

If your system is past ~12–15 years and facing a big repair, replacing usually wins. Knowing the tonnage means you can price an exact replacement in minutes. Furnace Direct ships the same equipment the pros install — factory-direct, no markup. Call (888) 762-1334 and we'll read your nameplate with you.

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Tell us about your system and a specialist will call you to get you the right replacement.

Want to talk now? Call (888) 762-1334 — 9 AM–7 PM ET, Monday–Saturday.

Serial/age estimates are provided as a convenience; the manufacturer's rating-plate date governs. All brand names are the property of their respective owners and are used for identification only.