Ductless Mini-Split Installation | Oakland & Macomb County

The short answer

Start with the complete system and the evidence

Ductless installation can serve spaces where conventional ductwork is limited, with equipment planned around each room's use and load. Sandison reviews zones, head locations, drainage, line routes, electrical supply, and cold-weather requirements before installation.

What Sandison evaluates

A practical path from symptoms to the right scope

Clear diagnostic process
Licensed multi-trade coordination
Repair and replacement options
Residential and commercial support

Scope and system boundary

Ductless Mini-Split Installation begins with the installed system and the specific failure

Ductless installation planning compares zones, head locations, line lengths, condensate routes, exterior appearance, structure, electrical circuits, cold-weather capacity, controls, service access, and how occupants will actually use each space. Indoor-air-quality work begins with the complaint, affected rooms, timing, occupants, moisture, visible sources, filtration, outdoor-air pathways, humidity, equipment cleanliness, airflow, pressure relationships, and activities that create particles or gases. The purpose is to identify the failed function, its effect on the property, and the accessible evidence—not to force every symptom into the same repair menu. Sandison records conditions that belong to another trade, utility, manufacturer, restoration provider, or design professional instead of hiding them inside an equipment recommendation.

Decision and verification

The ductless mini-split installation recommendation should show why the next step fits

The priority is source control and moisture correction, followed by ventilation and filtration choices matched to the contaminant, equipment capacity, pressure drop, maintenance, and occupant sensitivity. A defensible record identifies the observed source or condition, humidity and airflow information where useful, filter and equipment configuration, maintenance burden, stated limits, and the symptom used to judge improvement. The written scope separates included work, permit or inspection questions, concealed conditions, owner responsibilities, exclusions, and the verification expected after completion. Availability, exact pricing, warranty coverage, and project duration are confirmed for the actual property rather than promised by a general service page.

Primary references

Verify the local and credential information.

U.S. EPA — improving indoor air quality

Common questions

What property owners ask

Does every room need its own ductless indoor unit?

The zone plan depends on room loads, layout, occupant use, and how air can reach the intended spaces. Head placement and system compatibility need review before deciding the number of indoor units.

Where will the mini-split lines and drain run?

The route needs to account for refrigerant-line requirements, condensate drainage, wall protection, exterior appearance, and service access. Where gravity drainage is impractical, the plan must address the appropriate condensate arrangement.

What should be considered when adding ductless heating to an addition?

Review the space's heating and cooling loads, electrical capacity, equipment output in cold weather, and controls. The installation also needs practical outdoor placement and access for filter, coil, and drainage maintenance.

Evidence and review

Why this page can be trusted

Service information based on Sandison’s documented trade scope and the technical references below. Contact the office to discuss the conditions at your property.

Technical lead: James Sandison, B.S. Mechanical Engineering, Oakland University. Michigan Mechanical License 7115733 · Michigan Master Plumber 8112263 · Michigan Plumbing Contractor 800-3618. Service information record: 2026-08-28.