I keep my EU7000 in the garage and it rarely gets under 40 deg F during the winter, but I'm in NY. Outdoor temps can get near zero but it isn't common. You definitely want a battery tender, and you should probably use 5W-30 oil if you are running in very cold temps, but I don't think you will need an intake heater unless you are experiencing poor running performance. If you were in northern Canada or Alaska, I'd be more inclined to think you might need one. Hopefully we have some Honda generator users in really cold climates who can chime in and share their experiences...