A good fit improves unit performance.
Hire a professional.
A qualified air conditioning contractor is specially trained to assess a home's cooling requirements and identify the right size air conditioning unit. The contractor makes this calculation based on factors such as home size, insulation levels, existing furnace and ductwork, electrical capacity, and the number, type and orientation of windows.
Location, location, location.
A central air conditioning unit needs adequate air circulation. Locate the outdoor unit or condenser away from shrubbery and out of direct sunlight. Choose a spot where the noise will be least troublesome for you and your neighbours.
Stay on the level.
In new construction, consider installing the central air conditioning unit on a frame mounted to the home. Doing so will ensure the unit stays level as backfill around the home's foundation settles.
Keep refrigerant lines as short as possible.
Where the lines pass through the outside wall, pack the gap between the lines and wall with a resilient material, such as plumber's putty. This will prevent noise or vibration problems and air leaks.
Always match the coil to the unit.
When replacing an existing central air conditioning unit, replace the current indoor coil with one matched to the new outdoor unit. If the coil is not replaced, the new unit will not operate at its rated efficiency.
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