Verify the indoor mounting
Ask for the exact indoor model and its installation diagram. Some equipment is designed for floor placement. Other equipment has different mounting requirements.
Mitsubishi's MFZ-KJ floor-type manual gives model-specific indoor placement and outdoor site requirements, including snow considerations. It is an example of why the actual installation manual matters. Mitsubishi floor-type installation manual.
Have the installer mark required clearances around the proposed unit and explain airflow, sensing, and access. Include furniture and curtains in the drawing.
Assess the outdoor site
Ask how the plan addresses expected snow depth, drifting, roof shedding, wind, drainage, and service access. Use the exact outdoor model's instructions and the conditions at your address.
A southern wall can still have snow or access problems. Ask the designer to explain the site choice rather than assuming sun exposure resolves them.
Do not build a close-fitting enclosure, move the unit, or add supports yourself. Have qualified providers specify any required platform, structural work, or approved weather protection.
Check winter performance separately
Request the home's or room's heating calculation and the proposed equipment's output at the design temperature for the location. Ask what heat is available if the selected system cannot meet the need.
The mounting location does not establish heating capacity. A model recommendation needs both performance data and a suitable installation plan.
Get a complete proposal
The written scope should show models, indoor and outdoor placement, line and drain routes, electrical work, required permits, and excluded work. Confirm current local requirements with the responsible provider or authority.
Your next step is to request a site visit with a placement drawing and winter-performance comparison. We would settle the mounting and weather details before ordering equipment.