Written Written liquid gaseous Written No, it will not affect cooling as long as pipe length is within the allowed limit for pressure drop.Keep in mind, this is a closed system and when gas is moving down liquid is moving up.Ensuring carrying of lub oil along with gas is an issue when outdoor unit is at higher level. That is not a problem in this case.Question, I believe, is asking if buoyancy effect could adversely affect normal movement? This is not having any effect considering normal practical conditions.I do not know about any experiments or calculations to find the precise effects of these issues, however small it may be?Written Written Answers are all good. I would point out that if an indoor unit is much higher (several feet) than the condensing unit, it should have an inverted loop in the suction line near the evaporator to prevent liquid refrigerant floodback to the compressor.You don't have permission to access /viewcategory.cfm?categoryid=16 1 - 25 of 56 ads for "split system air conditioner installation price" within Air Conditioning & Heating