Yes, it is sometimes possible to install a heat pump on an internal wall.
While heat pumps are generally easiest to install on an external wall of a building, installation on an internal wall (specifically, a wall dividing two rooms) is not out of the question. According to expert insights, this type of installation is sometimes possible.
Internal vs. External Heat Pump Installation
Typically, heat pump systems, particularly split systems, involve an outdoor unit and one or more indoor units. The indoor unit is most commonly placed on an external wall because it simplifies the routing of necessary components like:
- Refrigerant lines
- Electrical wiring
- Condensate drain line
Connecting these elements from an indoor unit on an external wall directly through to the outdoor unit is usually the most straightforward path.
Why Internal Wall Installation is More Complex
Installing a heat pump on an internal wall is possible, but as referenced, it is usually a more involved and costly process. This increased complexity arises due to several factors:
- Routing Lines: The refrigerant lines, electrical cables, and condensate drain must somehow get from the internal wall location to an external point to connect with the outdoor unit. This often requires running these services through ceilings, floors, or other walls, which is more labor-intensive than simply drilling through a single external wall.
- Condensate Drainage: Indoor heat pump units produce condensation during cooling operation. This water needs to be drained away safely. Installing on an internal wall means the drain line must be routed further, potentially requiring a small pump if gravity drainage isn't feasible, adding cost and complexity.
- Structural Considerations: While often minor for standard indoor units, ensuring the internal wall can adequately support the unit's weight might require additional reinforcement.
- Aesthetics and Disruption: Running visible conduit or trunking to hide the lines can be less aesthetically pleasing. Hiding them within the wall structure or ceiling/floor cavity involves more significant disruption during installation.
Practical Insights
If considering an internal wall installation, it is crucial to:
- Consult with a Qualified Installer: A professional HVAC technician can assess the specific layout of your home and determine the feasibility, complexity, and exact costs involved.
- Evaluate Routing Options: Discuss how the necessary lines and drainage will be routed to the outdoor unit.
- Consider Noise: While indoor units are relatively quiet, their placement on an internal wall could potentially transfer operational noise more readily between adjacent rooms compared to an external wall placement.
In summary, installing a heat pump on an internal wall is sometimes possible, but be prepared for it to be a more complex and potentially more expensive project than a standard external wall installation.
