In Palo Alto, outdoor heat pump units installed under the City’s instant permit must be rated under 65 dBA, can’t go on the roof, and can’t sit between the street and the house or in view from the public right of way. The permit calculates a minimum setback from the property line. Quiet, variable-speed units in side or rear yards are the usual answer.
The rules that shape placement
Under the City’s instant permit for residential heat pumps:
- Units must have a noise rating under 65 dBA
- No rooftop installations
- Not between the street and the home or visible from the public right of way
- A minimum setback from the nearest property line is calculated and verified at inspection
- Noise is calculated for clusters within 10 feet; units farther apart need separate permits
Choosing a quiet unit
Variable-speed (inverter) heat pumps run at low speed most of the time and are much quieter than older single-stage units. Compare sound ratings when choosing equipment, since a few decibels can make a big difference in where a unit can go.
Placement tips
- Rear yards usually make setbacks easier and keep units out of view.
- Avoid bedroom windows, yours and your neighbors’.
- Leave clearance for airflow and service, typically at least a foot or two on the coil sides.
- Use a solid pad or stand, and anti-vibration pads to reduce transmitted noise.
- Plan line set routes to keep them short and tidy.
Small lots
On narrow lots, like many in College Terrace, the setback calculation can rule out some spots. Picking a quieter unit can open them back up. We run the numbers before you choose.
When the instant permit doesn’t fit
If no location meets the criteria, the City’s standard pre-application process is the path. It takes longer, but it allows review of special cases.
See heat pump installation and our instant permit guide.