Answers
Where should the outdoor unit go?
Airflow clearance, drainage, height above grade, lineset length, salt exposure and your neighbor’s bedroom window.
The short answer
Somewhere with free airflow on all sides, solid support, good drainage away from the foundation, a short lineset run to the indoor head, and distance from bedroom windows on both properties. In our climate, add height above grade so defrost meltwater and leaf litter do not sit in the base pan.
Airflow and clearance come first
The outdoor unit is a heat exchanger and it needs to breathe. Boxing it into a tight fence corner or under a low deck lets it recirculate its own discharge air, which drops capacity exactly when you need it and raises operating cost year round. Follow the manufacturer’s installation manual clearances rather than eyeballing it, and leave service access on the panel side so a technician can actually work on it.
Get it up off the ground
In heating mode the outdoor unit produces meltwater during every defrost cycle, and that water needs somewhere to go besides a puddle that refreezes around the base. We elevate on a pad, riser stand or wall bracket, drain away from the foundation, and keep it clear of roof drip lines and downspouts. In the foothills, height also means above expected snow, and on a steep lot it usually means brackets.
Salt air, mature trees, and other Whatcom specifics
Near salt water, put it on the leeward side away from direct spray and plan on a rinse routine. Coastal exposure is reported to shorten equipment life by two to four years without corrosion protection. Under mature maples and cedars, keep it out from under the heaviest leaf and needle drop.
Noise, sight lines and lineset length
Site it away from your bedroom window and your neighbor’s, and away from a hollow deck that will act as a sounding board. Keep the lineset run short, because every extra foot of pipe costs capacity and money. On a narrow city lot the best available spot is often the least obvious one, so we walk the whole perimeter before choosing.
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