Equipment & Tools

Model and serial numbers, unit age and what to carry.

Model & Serial Numbers

2 guides →

Tonnage, unit age and data plates.

How to Find AC Tonnage from the Model Number

Find the cooling capacity hidden in an air conditioner or heat pump model number, and convert the BTU code to tons.

How to Tell the Age of an AC or Furnace from the Serial Number

Decode the manufacture date from HVAC serial numbers for the major brands, and what to do when a format doesn't match.

Tools & Gear

1 guide →

What to buy first and how to care for it.

HVAC Tool List for New Technicians: What to Buy First

The hand tools, meters and refrigeration tools a new HVAC service tech actually needs first, and what can wait.