None. My old one was working just fine, don't buy into the energy saving stuff, you don't see the difference in your electrical bill anyway.
Broken fan and de-icing twice in the first 2 years! The first time was a surprise, it was brand new. I had to throw away a week worth of groceries. The second time, same fan started making a loud noise and they charged $149 to de-ice.
Don't buy! I should have returned it the first week.