Hardwiring a Range Hood: Wiring, Circuit and Cord Kit Options

Mounting a new range hood is mostly carpentry. The electrical step is where many installation guides go quiet, and it is the step that matters most for safety. Hardwiring range hood power means bringing a 120-volt supply cable into the hood’s wiring box and joining it with wire connectors, or choosing a plug-in power cord kit that lets the hood plug into a receptacle inside the cabinet above. Either route works, as long as the circuit is sized for the hood and the connections are made with the power off.

Part of our Kitchen Remodeling guide — explore the full guide →

This guide focuses only on the wiring: choosing the circuit, making the junction box connections, evaluating the cord-kit alternative and understanding how the hood’s fan and light switches are wired. Mounting the hood, cutting the duct opening and sealing the exhaust are separate jobs covered in a full range hood installation.

If the cable is already present at the hood location, connecting it typically takes 30 to 45 minutes.

Hardwiring Range Hood Basics: What Power Does a Hood Need?

Almost every residential range hood runs on standard 120-volt household power. Typical under-cabinet hoods draw roughly 1 to 5 amps; high-output island and professional-style hoods with large blowers and bright lighting can draw more. Check the rating plate inside the hood or the installation manual for the amp draw and the recommended circuit.

• Most manuals call for a 15-amp or 20-amp, 120-volt circuit with a ground.
• Some high-CFM hoods require a dedicated circuit, meaning nothing else is powered by that breaker.
• Remote or inline blowers may need their own supply or a separate cable from the hood to the blower.

Cable size must match the breaker: 14-gauge copper for a 15-amp circuit and 12-gauge for 20 amps. If you see a question about range hood wire online, this is the answer most people are looking for, since a mismatched wire gauge on a larger breaker is a genuine fire risk.

Safety Before You Touch Any Wires

Turn off the breaker and confirm power is off with a non-contact voltage tester before opening any box or handling the supply cable. Hold the tester against the cable and each conductor; it should stay silent. Many kitchens share lighting and hood power with other circuits, so switch off the right breaker and test again at the hood location itself. Do not test or measure voltage on live conductors. If you are unsure which breaker controls the cable, or the cable shows no clear markings, stop and bring in a licensed electrician.

Adding a new circuit, extending wiring through walls or installing a new receptacle in the cabinet is electrical work that usually requires a permit and should be performed by a licensed electrician. The steps in this guide assume a properly installed, grounded cable already reaches the hood location.

Tools and Materials

• Non-contact voltage tester
• Wire strippers and lineman’s pliers
• Screwdrivers (Phillips and flat)
• Wire connectors sized for the conductors
• A listed cable clamp or connector for the hood knockout
• Electrical tape
• Range hood power cord kit if you choose the plug-in method
• Flashlight or headlamp

Step-by-Step: Hardwiring the Hood to a Supply Cable

1. Locate the wiring compartment. Most hoods have a small metal junction box or cover plate near the top rear or inside the filter area. Remove its cover and the knockout that aligns with where your supply cable enters.
2. Install the cable clamp. Snap or screw a listed cable connector into the knockout. This protects the cable jacket from the sharp metal edge and provides strain relief.
3. Feed the cable. Pull the supply cable through the clamp, leaving about 6 inches of free conductor inside the box. Tighten the clamp on the cable jacket, not on bare wires.
4. Strip the conductors. Remove about 3/4 inch of insulation from the black and white wires, following the strip gauge on your connectors.
5. Connect ground first. Attach the bare or green supply ground to the green ground screw on the hood or to the hood’s green ground lead with a connector.
6. Connect neutral. Join the white supply wire to the hood’s white lead with a wire connector. Tug gently to confirm it is secure.
7. Connect hot. Join the black supply wire to the hood’s black lead. Again, tug-test the connection.
8. Tuck and close. Fold the wires neatly into the box, making sure no conductor is pinched by the cover, then reinstall the cover.

Restore power and test each fan speed and the lights to finish the hardwiring range hood job. A brief hum at startup is normal; buzzing, flickering or a warm cover plate is not, and means shutting power off and rechecking connections.

The Plug-In Alternative: Range Hood Power Cord Kits

Many under-cabinet and insert hoods can be converted to plug-in operation with a manufacturer-approved range hood power cord kit. The kit attaches to the hood’s wiring box and ends in a standard three-prong plug that connects to a receptacle mounted inside the cabinet above.

Benefits of the cord-kit route:

• Easy removal for cleaning or future replacement.
• No splicing inside the hood once the kit is attached.
• Simpler to swap hoods later without calling anyone back.

Limitations to consider:

• You need a grounded receptacle inside the upper cabinet. If one does not exist, installing it is a job for a licensed electrician.
• Only use a kit approved for your specific hood model; generic appliance cords may not be rated or permitted.
• Chimney-style and island hoods often have no concealed cabinet space for a plug, so hardwiring is the norm there.

Some local inspectors prefer hardwiring over cord kits for hoods mounted in certain configurations, so check with your building department if you are pulling a permit for a remodel.

Switch and Light Wiring Explained

Most hoods have built-in controls: a fan speed switch and a light switch on the front panel. In that case, a single constant-power cable feeds the hood and the hood’s internal wiring handles everything. You should not add a wall switch in series unless the manual allows it, because some electronic controls reset or malfunction when repeatedly cut off.

Older or basic hoods may be wired to a wall switch so the whole hood turns on and off from the wall. If your existing cable comes from a wall switch, confirm with the hood manual that this is acceptable. For hoods with separate fan and light circuits, wiring them to two separate wall switches requires a cable with an extra conductor, which is a job best left to a licensed electrician.

Ducting Considerations That Affect Wiring

People sometimes ask what pipe for range hood exhaust runs they should use while they are in the wiring stage. Use smooth rigid metal duct sized to the hood’s outlet, and keep the electrical cable clear of the duct path so the hot exhaust and sharp duct seams never rub the cable jacket. Route the cable to the hood’s wiring knockout before sliding the duct into place, since access tightens up afterward.

Troubleshooting

• Nothing turns on: Check the breaker, then confirm the black and white connections are secure with power off.
• Lights work but the fan does not: Internal fan wiring or a control board issue; consult the manufacturer.
• Breaker trips when the fan starts: The circuit may be overloaded by other kitchen loads, or the motor has a fault. A dedicated circuit may be needed.
• Controls act erratically: Electronic controls can react poorly to wall-switch cycling or loose neutrals.

Cost Ranges

If a cable is already in place, a DIY hardwiring range hood connection costs only a few dollars in connectors and a clamp. Cord kits generally cost about the same as a small appliance accessory. Hiring an electrician to connect an existing cable typically runs in the low hundreds; adding a new circuit or cabinet receptacle can cost several hundred dollars depending on panel access and wall construction.

When to Call a Licensed Professional

Bring in a licensed electrician whenever there is no suitable cable at the hood location, a new receptacle or circuit is needed, the hood requires a dedicated circuit your panel does not have, or you are unsure which breaker feeds the cable. Most jurisdictions require permits and inspections for new kitchen circuits, and a professional will verify that wire gauge, breaker size and grounding are all correct.