l leave my Janome 6500 at home when l go south for 4-5 months. l clean it ,but do not oil ( under bobbin is only place allowed anyway), unplug it, and put the dust cover over it. It is in my basement sewingroom ,so l also pick the foot pedal off floor & store it next to machine. When l return in spring, l then oil that bobbin wick, and make sure l use the machine for at least 15 min afterwards. The machine is computorized, and l've had no problems in the 7 yr l've done this. Meanwhile, in Fla., l have another machine that sits covered in a closet. The air conditioning is left on over summer though not turned down very far...mainly humidity needs to be kept down...that machine also has had no problems.