Bought this as Ive been wanting a hot tub for a while but didnt want to go full-blown just yet. Everything about it works great. For those in really cold temperatures yes you can still use it and it still heats up... When this arrived it was -6 out (Northern Canada) and I set it up outside. No issue at all to get everything going. Most people say it takes a full 24 hours to heat up. Mine took about 32 hours to heat up because it was so cold but it still made it! Works awesome so glad I got it.