Serial Number Decoder
Instantly find the manufacture date and age of any HVAC system or appliance. Supports 20+ top brands — free, no sign-up required.
How to Decode a Serial Number
Step 1: Find the Serial Number
Locate the data plate on your unit — usually on the side, back, or inside the access panel. Look for "Serial No." or "S/N".
Step 2: Enter & Select Brand
Type the full serial number exactly as shown. Select your brand from the dropdown, or leave it blank for auto-detection.
Step 3: Get Your Results
Instantly see the manufacture year, month, week, and approximate age of your unit.
Supported Brands
Click any brand for a dedicated decoder and detailed guide.
Why Does Your Unit's Age Matter?
🔧 Warranty Claims
Many manufacturer warranties are 5–10 years. Knowing the manufacture date confirms if you're still covered before paying for repairs.
💰 Repair vs. Replace
The general rule: if repair costs exceed 50% of replacement cost on a unit over 10 years old, replacing is smarter.
⚡ Energy Efficiency
Older HVAC units can use 50% more energy than modern units. Knowing your unit's age helps calculate potential savings from upgrading.
🏠 Home Buying/Selling
Real estate agents and home inspectors use equipment age to assess home value. Buyers should decode serials during inspections.