HVAC & Mechanical Noise: Mountain View vs San Jose
How do hvac & mechanical noise rules compare between Mountain View, CA and San Jose, CA?
Mountain View and San Jose have similar restriction levels.
Mountain View, CA
Santa Clara County
HVAC noise in Santa Clara County must comply with 55/45 dBA residential limits at neighbor property lines. New installations often need acoustic screening and setback compliance.
View full Mountain View rules →San Jose, CA
Santa Clara County
San Jose regulates HVAC equipment noise under SJMC Chapter 20.30 (zoning) and Chapter 10.16 (noise). Mechanical equipment must be set back at least 5 feet from the rear property line and screened with a 5-foot masonry wall or solid fence. Noise must not be plainly audible past the property line during nighttime hours.
View full San Jose rules →Key Facts Comparison
| Fact | Mountain View | San Jose |
|---|---|---|
| Day Limit | 55 dBA at property line | - |
| Night Limit | 45 dBA (10 PM to 7 AM) | 75 dB(A) at property line |
| Setback Minimum | 3 feet from side-yard typical | - |
| Tonal Penalty | +5 dBA for pure-tone hum | - |
| Permit Required | Mechanical permit for install | - |
| Rear Setback | - | 5 ft minimum |
| Screening | - | 5-ft masonry/wood fence |
| Code | - | SJMC Ch. 20.30, Ch. 10.16 |
Highlighted rows indicate differences between cities.
Mountain View FAQ
My neighbor installed a loud AC compressor. What can I do?
Document times and call Code Enforcement. If measured levels exceed 45 dBA at night, the neighbor must mitigate with enclosures or relocation.
Do heat pumps need special approval?
Yes, a mechanical permit. Sound ratings are reviewed, and placement must meet setback and noise rules.
San Jose FAQ
Where can I place an outdoor HVAC unit in San Jose?
In rear setbacks with a minimum 5-foot setback from the rear property line. Not permitted in front setbacks or front yards. Must conform to side setback requirements.
Do I need to screen my HVAC equipment?
Yes. A masonry wall or solid wooden fence of at least 5 feet in height is required to screen mechanical equipment.
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