Answer first
The nearest wall is not always the best wall. The survey should compare candidate positions against manufacturer clearances, planning rules, sound, exposure, maintenance and the internal plant location.
Do not box the unit in to hide it. Restricted recirculating air can reduce performance, increase noise and make servicing difficult.
Manufacturer clearances and discharge space must be protected
View sourceLocation and neighbouring receptors form part of siting
View sourceThe unit needs safe future maintenance and replacement access
View sourceHave FLO compare outdoor-unit positions at your home
Tell FLO about the property and current heating. A survey turns the general guidance into a room-by-room design and written quote for the complete system.
Air must enter and leave freely
The fan moves a large volume of outside air across the coil. Walls, fences, planting and covers can cause discharged cold air to recirculate.
Follow the chosen manufacturer’s clearances rather than one generic sketch. Keep leaves, snow and stored items away from the intake and discharge.
Sound is a site decision
Fan and compressor sound changes with output and conditions. Distance, reflections, corners, bedroom windows and neighbouring amenity all affect perception.
The planning and MCS assessment should use the proposed model and exact position. Moving the unit slightly can be more effective than relying on an enclosure later.
Plan water, frost and weather
Defrost produces water around the outdoor unit in cold conditions. Drainage should not create ice across a path or damage the building.
The base must remain stable and allow clearance from ground conditions. Exposed coastal or elevated sites may need specific corrosion and wind considerations.
Short pipework is useful, but not the only goal
A direct insulated route can limit heat loss and complexity, yet accessibility, appearance and indoor plant arrangement also matter.
The survey should show the chosen route, penetrations, drainage and isolators so the finished installation is predictable.
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Questions people also ask
Can I put the unit in a garage?+
An air-source unit normally needs free outdoor air; an enclosed garage is generally unsuitable unless specifically engineered.
Can it go under a window?+
Possibly, but clearances, sound, condensate and planning must be checked for the exact model and site.
Can I build a cover around it?+
Only a manufacturer-approved arrangement that preserves airflow and access; decorative boxes often create problems.
Evidence used for this answer
Figures are explained in context and links go to the independent source. Prices, tariffs, scheme rules and standards can change, so check the source again before making a financial or technical decision.
- MCS domestic heat-pump guideConsumer guidance covering design, installation, controls, handover and maintenance.
- MCS heat-pump design standardTechnical requirements for heat loss, equipment selection, domestic hot water and system design.
- Energy Systems Catapult: home surveys and installation reportEvidence from 742 installations, including radiators, cylinders, survey constraints and typical installation duration.