How to Eliminate Background Noise When Recording at Home

Every home recording has noise. The question is whether it's noise the listener will hear. After 1,400 episodes, I've found that 90% of the noise issues come from five identifiable sources — and each one has a fix that costs under $30.

In my first year of producing podcasts, I spent more time fighting background noise in post than recording the actual interviews. After 1,400 episodes, I've developed a more systematic approach: identify the noise source, fix it at the source, only then reach for a plugin. The plugin work goes from "two hours per episode" to "five minutes per episode" when the front-end is right.

Diagnose before you fix

Before fixing anything, record 30 seconds of silence in your room with everything you'd normally have running during a session. Open the recording in your DAW and look at the spectrum. You'll see noise at specific frequencies — the kind of noise tells you the source:

Low rumble (under 100 Hz): HVAC, refrigerator, traffic, computer fans.
Steady mid-range hiss (1–5 kHz): Mic preamp self-noise, cheap microphone hiss.
Buzz at 50 or 60 Hz (and harmonics): Ground loop or electrical interference.
Intermittent clicks or pops: Cable issues, wireless interference, USB grounding.

Knowing which is which determines the fix.

1. Computer & equipment hum

Your laptop's cooling fan is probably louder than you think. So is its hard drive (if it has one), its power supply, and the high-pitched whine of certain capacitors under load. Together these often produce 20–40 dB of broadband noise that climbs above the noise floor of your room.

Fixes, in order of cost:

Free: Move the computer as far from the mic as your cable allows. Sound pressure drops as the square of distance. Six feet of separation produces a meaningful audible difference.
$15: A USB extension cable lets you put the computer on the floor under the desk, or in another room entirely. For interface-to-computer connections, a 10-ft USB-C extension works fine.
$50: A small acoustic enclosure for the computer (just dense closed-cell foam panels around it, leaving airflow). Cuts another 5–10 dB.

2. HVAC, fans, and fridges

The single noisiest device in most homes is the HVAC system. The single most overlooked is the refrigerator, which cycles on and off without warning during recording.

Fixes:

Turn off HVAC during recording sessions. Yes, even in summer. Record in 25-minute blocks, give the room two minutes to cool/heat between takes.
For the refrigerator, if it shares a wall with your recording space, the noise is usually compressor cycling and you can't make it quieter. You can identify which cycle phase is loudest (typically the first few minutes after a kick-on) and record around it.
Box fans, oscillating fans, anything mechanical: off during sessions. Period.

3. Outside noise

Traffic, neighbors, lawnmowers, garbage trucks, sirens. You cannot eliminate these. You can reduce their audibility through window plugs and curtains (covered in my soundproofing guide), but more importantly, you can time around them.

I keep a noise log for any new podcast client during their first two sessions. We identify when the recurring noise events happen — recycling pickup Tuesday at 7 a.m., elementary school recess at 10:15, that one neighbor's leaf blower most Saturday mornings — and schedule recording during the gaps. This sounds tedious. It saves more time than any plugin ever has.

4. Handling and vibration noise

Many home recordings have a low-frequency rumble that appears whenever the speaker shifts in their chair, types, or even taps their foot. The mic is picking up vibration through the desk and stand.

Fixes:

Boom arm instead of desk stand. Boom arms typically decouple the mic from the desk surface much better than tripod stands.
Shock mount. An elastic suspension between the mic and its stand kills most mechanical noise. $25 for a universal one. Worth it.
Mouse pad under the keyboard. Yes, really. Reduces the thud-thud-thud that a hard typing surface transmits into the desk and into the mic.

5. Electrical & RF noise

The single-frequency buzz at 50 Hz (Europe) or 60 Hz (North America), or a high-pitched whine, almost always means ground loop or RF interference.

Ground loop: Plug all your audio gear (computer, interface, mixer, monitors) into the same power strip on the same outlet. This is fixed 80% of the time.
RF interference: Move your phone, Wi-Fi router, and wireless devices away from your interface and mic cable. USB cables, especially long ones, can pick up nearby RF — try a shielded one.
Dimmer switches: Dim LED lights in the recording space and you can introduce significant electrical hum. Use full-on lighting or candles, not dimmed LEDs.

When to use denoise plugins

After all of the above, there will still be some residual noise. This is when a plugin earns its keep:

Steady-state noise reduction: iZotope RX Spectral De-noise, Waves NS1, Accentize dxRevive. Free options like Audacity's Noise Reduction work fine for podcasting if you give them a clean noise sample.
Low-frequency rumble: A high-pass filter at 80 Hz (for voice) or 60 Hz (for full-range music) removes most rumble without affecting the audible content.
Clicks and pops: RX's De-click module is genuinely magical and worth the price if you do this a lot.

The rule: every minute spent fixing at the source saves ten minutes in post. Every dB of noise you don't capture is a dB you don't have to remove. More on the podcast-specific workflow here.