It was measured with the freezer strips intact and exposed. Floor temp directly in front of the strips was 76, which I thought was pretty damn good with it being 10 outside. Ghost is in his 4x8 indoor condo till spring.Great....did you measure your temps with the enclosure door open all night long? Or closed. Anyhow, good luck. Our Sully is in her inside area now that also has a nice 6x3 foot night box. A cozy burrow.