GE 24‑Hour Mechanical Outlet Timer Switch, Dual Grounded Plug‑in Control for Indoor Lighting, Lamps, Christmas Trees, Fans and Small Appliances (1 Pack), 15075

Electric heater and a timer plug is what I go with. Doesn't cost much and I can pre-heat the garage and barbells in the morning. edit: idk what other solution there is, other than a head pump like the other person said