I tested our RV45D in our home. Prechilled with some frozen jugs. Temperature was 77. It cooled down quickly, I was surprised how quiet it is. I then moved it onto our screened porch outside. It was 94 degrees. Real feel 99. I had left the frozen jugs in the unit overnight , they had partially thawed. It took several hours for the freezer to reach 0, but once it did the unit maintained 0. I took a reading inside the freezer with my infrared thermometer and it read -14. The refrigerator side, larger side for us, got to 35 quickly, also held temperature. I cant wait to use this on our next RV trip.