Most tool lists online are written by people trying to sell you something. This one's sorted by what you'll actually do around your house. Grab the first group now. Pick up the rest when you've got a real project lined up.
Everyday maintenance
- Nut drivers, 1/4" and 5/16": pretty much every service panel on furnaces and condensers uses these two sizes.
- Wet/dry shop vac: clears out condensate lines, drain pans, and the mess around your outdoor unit.
- Fin comb: straightens bent coil fins so air can actually get through.
- Coil cleaner: grab a foaming no-rinse type for indoor coils, plus an outdoor condenser cleaner.
- Headlamp: furnace closets and attics are never lit well enough.
Electrical troubleshooting
- Non-contact voltage tester: quick first check to see if something's live. Don't trust it by itself to confirm power's off though.
- Multimeter with capacitance and a clamp: checks voltage, tests capacitors, and measures motor current. A true-RMS meter is worth the little bit extra.
- Insulated screwdrivers: for anything near the contactor or capacitor.
Installing a mini split
This is where costs stack up fast, so borrow or rent what you can.
- Torque wrench with flare crowfoot adapters: flare nuts need exact torque values.
- Vacuum pump and micron gauge: see the vacuum guide. The micron gauge matters more than whatever pump brand you get.
- Flaring tool: only if you're cutting and flaring line sets yourself. An eccentric cone flaring tool gives you consistent flares.
- Hole saw for the wall penetration: check your manual for the right size, usually around 2.5 to 3 inches.
- Level and stud finder: the indoor unit's mounting plate has to be level and solidly anchored.
What you can skip
Unless you've got an EPA 608 certification, a manifold gauge set is mostly for pressure-testing and pulling vacuum, not for charging. Buying and adding refrigerant to most systems is regulated in the US. If a system needs refrigerant, it's also got a leak, and that means calling a technician.