Guardian HVAC Age Lookup Tool

Guardian comes from York Unitary Products, the Johnson Controls division, and shares its platforms with York, Coleman, and Luxaire. Knowing the age helps you plan maintenance and budget for an eventual replacement. Enter your Guardian serial number, free and with no sign-up, to see the build date and age.

Selected Brand

Guardian HVAC System

Change

2Enter Your Serial Number

Affiliate Partner

Need an HVAC pro? Get free quotes from trusted local HVAC contractors

Get Quotes Are you an HVAC contractor? Learn about our partner program

Affiliate Partner

Protect your HVAC system and 20+ home systems with a home warranty

Get a Free Quote

Finding Your Guardian Serial Number

Check these four spots on your HVAC system

Common Locations

Outdoor unit

data plate on the side

Electrical panel

inside the access door

Indoor air handler

inside the cabinet door

Rating plate

top or rear of the unit

What to Look For

White or metallic manufacturer sticker
Labeled "Serial No." or "S/N"
Typically 8–12 characters long
Usually near the model number

Can't find it? Try the electrical access panel on the front of the outdoor unit or inside the air handler cabinet.

Serial Number Examples

Guardian

W0F7982700W0K5896070

2nd & 4th characters = year, 3rd character = month (letter code)

Don't worry if yours looks different — each brand has multiple formats and our system can decode most variations.

About Guardian HVAC Systems

Owned by Johnson Controls (York Unitary Products)

Guardian is a value-focused residential brand from York Unitary Products, the heating and cooling division of Johnson Controls. It is a trademarked brand of Fraser-Johnston within the Unitary Products Group and shares its platforms with York, Coleman, and Luxaire. The branding and warranty package are the main differences from its sister brands.

Guardian serial numbers use the standard York and Johnson Controls format. The 2nd and 4th characters combine to form the two-digit year, and the 3rd character is a letter that gives the month of manufacture.

Common Guardian HVAC Models & Series

The most-installed Guardian residential systems on the market today, organized by tier. Knowing your series helps narrow down service parts and warranty terms.

Series	Type	Tier	Efficiency	Notes
Single-Stage Air Conditioner	Air Conditioner	Entry	Up to 14.3 SEER2	Single-stage scroll on the York platform; the Guardian volume unit.
Higher-Efficiency Air Conditioner	Air Conditioner	Mid-range	Up to 16 SEER2	Single-stage with an improved coil.
Single-Stage Heat Pump	Heat Pump	Entry	Up to 15 SEER2	Single-stage heat pump for moderate climates.
Gas Furnace	Gas Furnace	Entry	Up to 80 AFUE	Single-stage 80% furnace.

Guardian HVAC Quick Facts

Warranty

Guardian generally offers a 10-year parts warranty with registration, dropping to a shorter base term if not registered. As a builder and distributor brand, terms can vary by project.

Expected Lifespan

AC / Heat pumps: 13 to 18 years
Furnaces: 18 to 25 years

Where It's Built

York Unitary Products plants, including Norman, Oklahoma, where Johnson Controls builds its residential ducted equipment.

Price Positioning

Budget tier within the York and Johnson Controls family.

Known Guardian Issues to Watch For

A short list of patterns reported on Guardian equipment. Most have been addressed with revised designs or service bulletins, but they're useful context if you're diagnosing an older system.

•Guardian shares the York and Johnson Controls platform, so it behaves like York, Coleman, and Luxaire equipment of the same era.
•As a value and builder line, Guardian units often carry fewer features than the York-branded versions of the same equipment.
•Parts cross-reference across the York family and can be sourced through any York or Johnson Controls dealer.

Guardian HVAC FAQs

Find the data plate on the side of the outdoor condenser near the service valves and inside the furnace cabinet. York-format serials use the 2nd and 4th characters for the year and the 3rd character for the month.