No one is going to let you use their home gym unless they know you, because of the liability issues. Your best bet is to build your own (squat racks are portable, if heavy, and you can also do about 19 varieties of squats without a full rack), or put an ad on craigslist asking if you can come to an arrangement with someone who has a home gym. Maybe they're looking for a workout partner to spot them or something? Worth a shot.