Do you have a fan on in the room dissipating the heat from the closet? What is the ambient temp. since your cold side is 67? How are you measuring temps? Where is the placement of your probe?

Under Cage Heat X 1.5: This is workable for those with a single 421D cage if the room it is kept in is at least 72 degrees during the day and 68 at night. This size also works well for people with 422D cages stacked as they gain heat and benefit from each other.

I think your room temp is throwing you off somehow but on getting up to 78? something don't sound right. I use 1.5 heat and I heat mine up to 85 problem even with the room at 68. Have you tried plugging your flexwatt into the wall for a little while just to see if you can raise it above 78 but by all means it needs to be controlled but then you know it is your thermostat.

Hope it helps
Bob

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