Bedroom Split Units
Noise at night is the most common complaint we get called out for.
Noise Diagnostic
What Our AC Noise Diagnostic Covers
Every AC noise has a physical cause, and most are simple to find once an engineer knows where to look. Our noise diagnostic covers the full unit, indoor casing to outdoor cabinet, so you get a clear answer and a fixed repair price, not a guess.
- ✓Full listening test through the unit's complete operating cycle
- ✓Indoor casing, panels and mounting bracket inspection
- ✓Outdoor cabinet, panels and fixing screws checked and re-secured
- ✓Fan blade inspection for cracks, warping or imbalance
- ✓Capacitor and electrical connection test
- ✓Compressor mount and vibration isolation check
- ✓Relay and control board diagnostic
- ✓Refrigerant line and joint inspection for leaks
- ✓Written diagnostic report identifying the confirmed cause
- ✓Fixed repair quote agreed before any work begins
Diagnose the Sound
What Different AC Noises Mean
Match the sound you're hearing to the likely cause below — it's a useful first step, though only an on-site check confirms it.
| Noise | Likely cause | What we do |
|---|---|---|
| Rattling | Loose outdoor panel, mounting screws or debris in the fan cage | Tighten panel and screws, clear debris, refit fan guard |
| Buzzing | Failing capacitor, loose electrical connection or worn contactor | Test and replace the capacitor or connection, check the contactor |
| Clicking (repeated) | Failing relay or control board, or a fan blade catching | Test relay and control board, realign or replace the fan blade |
| Hissing / whistling | Refrigerant leak at a joint, valve or coil | Locate and seal the leak, then refrigerant gas refill |
| Banging / knocking | Loose compressor mount or a bent fan blade | Re-secure the compressor mount, straighten or replace the fan blade |
Real Visits
Where We Hear These Complaints Most
Some rooms and unit types generate far more noise call-outs than others.
Living Room Systems
Rattling and buzzing on larger units, especially older installs.
On-Site Noise Diagnosis
Full listening test and component check before any part is replaced.
Before You Call
Self-Check: Signs You Need a Repair Call
These checks narrow down the cause before an engineer arrives, and flag when a call-out shouldn't wait.
- ✓The noise only happens when the unit starts up or shuts down
- ✓The sound has gotten louder or more frequent over the past few days
- ✓The noise is paired with weaker cooling or a burning smell
- ✓The outdoor unit visibly vibrates or shakes when running
- ✓You can see a loose panel, missing screw or gap in the outdoor casing
- ✓The noise changes with the fan speed setting
- ✓The sound is new and the unit is more than 5-7 years old
Our Process
How We Diagnose & Fix AC Noise
From your first message to a silent unit again, here's what to expect.
Describe the sound
Call or WhatsApp with when and where the noise happens, indoors, outdoors, startup or running.
On-site listening test
The engineer runs the unit through its full cycle to isolate the exact source.
Component inspection
Panels, screws, capacitor, fan blades, mounts and refrigerant lines checked.
Fixed quote
The cause is confirmed and the price agreed before any part is touched.
Repair & retest
The fix is carried out and the unit run again to confirm the noise is gone.
Warranty issued
A 2-year written workmanship warranty covers the completed repair.
Pricing
What Affects the Price of a Noise Repair
What drives the price is which component has actually failed, not how loud the noise is — a screeching bearing and a faint hiss can cost very differently to put right. A loose panel or screw is often fixed on the diagnostic visit itself; a failing capacitor, compressor mount or refrigerant leak needs the part or gas on hand and a short follow-up. The diagnostic callout starts from €75 and is waived if the repair goes ahead, with the exact price always confirmed in writing before any work starts.
| Factor | Why it matters |
|---|---|
| Which component has failed | A tightened screw costs far less than a replaced capacitor or compressor mount. |
| Access to the outdoor unit | Units mounted high or in tight spaces take longer to service safely. |
| Whether refrigerant recovery is needed | Hissing or leak repairs may require refrigerant recovery and a full regas. |
| Age and warranty status of the unit | Parts still under manufacturer warranty may be replaced at reduced cost. |
Why Square Meter
Certified Engineers, Fixed Prices, Real Warranty
Square Meter's AC division is the certified, insured HVAC arm of the wider Square Meter renovation, plumbing and electrical group in Valencia, so noise faults are diagnosed by an English-speaking engineer who understands both the unit and the wall or ceiling it's mounted in.
2 yrWorkmanship warranty on every repair
24hEmergency response, 7 days a week
1 DayQuote turnaround for non-urgent requests
7Major brands serviced and repaired
Coverage Area
Where We Fix Noisy AC Units
We diagnose and repair AC noise faults across Valencia city and the surrounding towns and neighbourhoods:
ValenciaMislataBurjassotPaternaTorrentAlborayaManisesQuart de PobletRuzafaBenimacletCampanarPatraixExtramurs
FAQ
Air Conditioning Making Noise — Common Questions
Rattling is almost always mechanical, coming from a loose outdoor unit panel, mounting screws that have vibrated loose, or debris caught in the fan cage. It is usually a simple, low-cost fix once an engineer opens the unit and tightens or clears the cause.
A buzzing sound typically points to an electrical issue such as a failing capacitor, a loose electrical connection, or a contactor beginning to fail. It should be checked promptly since electrical faults can escalate to a full breakdown or compressor damage.
A single click when the unit starts or stops is normal, usually the casing expanding or contracting with temperature, or the relay switching. Repeated or continuous clicking during operation can indicate a failing relay or control board and is worth having checked.
A hissing or whistling sound from an air conditioner is one of the more serious noises, usually indicating a refrigerant leak at a joint, valve or coil. It should prompt a professional inspection rather than a simple gas top-up, since the leak itself needs to be located and sealed.
A banging or knocking noise from the outdoor unit is often caused by a loose compressor mount, a bent fan blade, or a fan motor bearing wearing out. It should be switched off and inspected before it causes further internal damage.
Square Meter's diagnostic callout starts from €75, waived if the repair proceeds, and most noise-related repairs, such as tightening panels, replacing a capacitor or refitting a compressor mount, are completed in a single visit with a written quote provided before work begins.
Related Services
Other Ways We Can Help
Noise problems often overlap with wider AC health — these related services cover diagnosis, upkeep and replacement.
Strange Noise? Let's Get It Checked.
Don't wait for a rattle or hiss to become a breakdown — call, WhatsApp or request a quote and we'll pin down the cause and quote a fixed price before we start.