Key takeaways
- Modern variable-speed units are quiet most of the time because they run at low speed.
- Indoor ductless heads are whisper-quiet on low; outdoor units are similar to a modern AC.
- Placement and mounting matter as much as the model.
Putting the numbers in context
Decibels are logarithmic: every 10 dB sounds roughly twice as loud. Manufacturer ratings are measured in specific conditions, so compare models using the same kind of rating.
Placement tips
- Keep the outdoor unit away from bedroom windows — yours and your neighbours’
- Use a solid pad or wall bracket with anti-vibration mounts
- Avoid tight corners and narrow side yards that reflect sound
- Leave room for airflow — a starved unit runs faster and louder
- Ask about a “quiet” or night mode
Defrost sounds
During defrost you may hear a short “whoosh” as the valve switches. It’s normal and brief.
Common questions
Is it louder in winter?
It can be on the coldest days, when the compressor runs faster. Most of the time it runs at low speed and is quieter than an old AC.
Are there noise rules?
Municipalities have noise bylaws. A reputable installer places equipment with neighbours in mind.