Tools of the Trade
An illustrated glossary of 30 common HVAC tools with plain-language explanations, plus a pro-vs-DIY and safety note for each.
Last updated: 2026-09-15
Tools glossary
Manifold gauge set
Reads refrigerant high/low pressures to diagnose system charge.
Digital manifold
Electronic version with temperature clamps for live superheat/subcooling.
Refrigerant scale
Weighs refrigerant in/out for accurate charging.
Vacuum pump
Removes air and moisture from lines before charging.
Micron gauge
Measures deep vacuum to confirm a dry, sealed system.
Recovery machine
Legally recovers refrigerant instead of venting it.
Electronic leak detector
Sniffs for refrigerant leaks along coils and joints.
UV dye leak detector
Dye + UV light finds slow leaks over time.
Multimeter
Measures voltage, resistance, and continuity in controls.
Clamp meter
Measures current without breaking the circuit.
Capacitor tester
Tests start/run capacitors safely after discharge.
Thermometer / psychrometer
Measures dry/wet bulb for temperature and humidity.
Manometer
Measures duct pressure for leakage and airflow.
Combustion analyzer
Checks furnace flue gases for efficiency and safety.
Carbon monoxide detector
Portable CO meter to check for unsafe levels.
Duct blaster / blower door
Pressurizes ducts/home to measure leakage (HERS).
Airflow hood
Measures CFM at each register for balance.
Anemometer
Measures air velocity at grilles and coils.
Tubing cutter
Cuts copper refrigerant lines cleanly.
Flaring / swaging tools
Forms flare and swage joints in copper tubing.
Brazing torch + nitrogen kit
Brazes joints while purging with nitrogen to prevent oxidation.
Nitrogen regulator
Controls nitrogen pressure for purging and pressure testing.
Fin comb
Straightens bent condenser fins to restore airflow.
Coil cleaner sprayer
Applies coil cleaner and rinses for efficiency.
Duct tape vs. mastic
Tape is temporary; mastic sealant is the durable duct seal.
Sheet-metal snips / seamers
Cut and fold sheet metal for ducts and plenums.
Crimper
Crimps male ends on round pipe for slip-fit joints.
Core removal tool
Removes/replaces Schrader cores without losing charge.
Thermal camera
Shows insulation gaps, duct leaks, and hot spots.
Smart thermostat setup tools
App + C-wire testing for smart thermostat install.