Mini Splits: Best practices for infrequent use? - GreenBuildingAdvisor

Mini Splits: Best practices for infrequent use? NeaV | Posted in Energy Efficiency and Durability on March 30, 2026 03:42pm I live somewhere with fairly mild summers and a well insulated house, and recently got new mini splits. I anticipate maybe using my mini splits a week or two at most for cooling based on my previous years window A/C usage. My primary use case will be heating. So I’m wondering what the best practices are during the months basically from April/May until October where I dont use any kind of heating and rarely use cooling. 1. Turn the indoor heads off and leave the outdoor condensers on. This will have an idle draw, but might it be better for the longevity of the equipment to leave it on so it can take care of oil recovery/refrigerant migration? I’m not too clear on this point, just heard some people talk about needing to periodically circulate refrigerant. I know there’s also talk of crankcase heating but that’s probably not relevant for warm weather? 2. According to the Bryant/Carrier manual, for extended non use, we should run the fans to get the moisture out of the indoor heads. Then turn off the outdoor condensers. If we start it up again, let it run for 12-24 hours before using it. This is most energy efficient but I’m worried about letting equipment sit idle without any airflow, and if there might lubrication issues if sitting unused for a long time. 3. When heating/cooling isn’t needed, just run the indoor heads anyway at low fan speeds. This feel...