Differences in installation between split-type and central air conditioning indoor units
The core difference between the installation of split-type (wall-mounted, floor-standing) and central air conditioning indoor units lies in the difference between the simple construction of exposed installation and the meticulous pre-installation of concealed installation. The two differ significantly in terms of installation timing, construction techniques, space occupation, pipeline layout, and construction standards, directly impacting the renovation progress, aesthetics, user experience, and subsequent maintenance. Specific differences are as follows:
I. Differences in installation timing and compatibility with decoration
1. Split-type indoor unit
This is a finishing installation after renovation , offering exceptional flexibility. It doesn't require coordination with the hard furnishing construction and can be installed after the entire house renovation is complete, including wall paint, wallpaper, and ceiling installation. It's a standalone finishing process. It can be installed at any time for old house renovations and additions to newly renovated apartments, without damaging the existing structure. It doesn't require pre-planning large amounts of structural space and is suitable for all stages of renovation and completed homes.
2. Central air conditioning indoor unit
As a concealed project in the early stages of renovation , it must be carried out simultaneously with water and electricity modifications and is a core process in the early stages of hard decoration. Indoor unit installation, pipe pre-laying, and condensate drainage layout must all be completed before ceiling construction and wall paneling, and need to be integrated into the overall house renovation plan in advance. If added during or after the renovation, partial removal of the ceiling and walls is required, resulting in extremely high construction costs. Therefore, it is only suitable for decorating unfinished new houses and cannot be used in already completed, fully furnished homes.
II. Differences in Installation Methods and Space Occupancy
1. Split-type indoor unit
It adopts an exposed mounting method with no ceiling concealment. The wall-mounted unit is suspended in mid-air on the wall, while the floor-standing unit is placed on the floor. The entire unit is completely exposed, without taking up ceiling height or compressing the room's net height. It has no strict requirements on ceiling height and is suitable for small apartments and apartments with low ceilings. The disadvantage is that the indoor unit and pipelines are exposed, which will take up wall and floor space, creating a visually obtrusive effect and potentially disrupting the overall minimalist style of the home décor.
2. Central air conditioning indoor unit
Employing an embedded, concealed installation method, the entire unit is hidden within a portion of the ceiling, with only the air outlet and return air vent exposed, blending seamlessly with the décor for a more unified aesthetic. However, this requires additional ceiling height; a standard ceiling height of 25-30cm is needed, and the final ceiling height must be at least 2.5 meters to avoid a feeling of confinement. It has strict requirements regarding ceiling height and ceiling design, making it suitable only for homes with ample ceiling height. At the same time, it doesn't occupy usable wall or floor space, resulting in a more open and uncluttered feel throughout the house.
III. Differences between Pipeline and Drainage Construction
1. Split-type indoor unit
The piping structure is simple and easy to install. Each indoor unit has its own independent copper pipe and drain pipe. The piping is short and has a single route, requiring only one simple through-wall hole to connect to the outdoor unit. Most of the piping is laid openly along the wall or corners, with a small amount concealed in simple grooves. Drainage relies on the built-in drip tray for natural drainage, requiring minimal slope and eliminating complex pre-embedding procedures. There are virtually no construction risks, and troubleshooting drainage problems is simple and intuitive.
2. Central air conditioning indoor unit
The piping system is complex, with all components concealed and pre-installed. Multiple indoor units share a single outdoor unit system. Refrigerant copper pipes, insulation, condensate pipes, and control lines are all hidden inside the ceiling. The piping layout requires precise planning to avoid conflicts with beams, columns, and electrical/plumbing lines. Drainage necessitates a dedicated condensate lift pump and pre-installed drainage pipes , placing extremely high demands on pipe slope, sealing, and insulation. Leaks and condensation inside the ceiling must be completely eliminated. The long piping lengths and numerous interfaces make the installation far more sophisticated than with split-type air conditioners.
IV. Differences in Construction Difficulty and Technological Standards
1. Split-type indoor unit
The installation process is simple, with low barriers to entry, short construction time, and straightforward standards. A single unit can be installed by one or two people, taking only 1-2 hours. The core procedures are simply fixing the unit, connecting pipelines, drilling and sealing, and commissioning. No complex technical requirements are needed; ordinary installers can operate the system. It has a high tolerance for error, low installation costs, and most brands offer free basic installation.
2. Central air conditioning indoor unit
The project has high barriers to entry, a long construction period, and stringent standards. A professional team is required for complete installation. The installation of all indoor units and the pre-installation of piping throughout the house takes 3-7 days. The process is complex, involving multiple critical steps such as horizontal hoisting of the unit, vibration damping and fixing, copper pipe welding, insulation wrapping, pressure testing, and drainage and commissioning. A gap of at least 1cm must be maintained between the indoor unit and the ceiling to avoid vibration and abnormal noise during operation. Precise matching with the ceiling design and air vent dimensions is also essential. The margin for error in construction is extremely low; substandard workmanship can easily lead to problems such as leaks, abnormal noise, and uneven cooling.
V. Differences in Outdoor Unit Matching and Installation Layout
1. Split-type indoor unit
One-to-one matching of outdoor units, with one indoor unit corresponding to one outdoor unit. Multiple rooms require multiple outdoor units, necessitating multiple installation spaces on the exterior wall. This results in a large number of units occupying significant exterior wall space, dispersed noise, and cluttered exterior piping, affecting the building's facade appearance. Each room's air conditioning operates independently; a failure in one unit does not affect the use of other units.
2. Central air conditioning indoor unit
Multiple outdoor units can be matched to one indoor unit, allowing one outdoor unit to connect with multiple indoor units throughout the house (one-to-many). Only one outdoor unit space needs to be reserved, keeping the exterior wall clean and free of messy pipes, greatly saving exterior wall space. All indoor units share a single system, resulting in a neat and uniform layout. However, a failure of the outdoor unit will cause all air conditioning in the house to shut down, placing higher demands on equipment stability and installation quality.
VI. Differences between Post-Maintenance and Repair
1. Split-type indoor unit
Inspection and maintenance are convenient and efficient. The body, pipelines, and interfaces are all exposed, so filter cleaning, pipeline inspection, and troubleshooting do not require dismantling or renovation. Routine maintenance can be performed by the user, resulting in low maintenance costs and fast speed. Later modifications and relocations do not require damage to the walls or ceiling.
2. Central air conditioning indoor unit
Maintenance relies on professional operation, and repairs are limited. The unit and pipelines are all hidden inside the ceiling. Routine filter cleaning requires opening the air vent access panel. Problems such as pipeline faults, leaks, and blockages require partial removal of the ceiling for inspection, making maintenance difficult and costly. A standard access panel must be provided during installation. If not, later repairs will require dismantling and altering the ceiling, damaging the structural integrity of the building.
