The issue is likely the ambient air temps tub do not have much (any) insulation so they lose heat as fast as it can be added. Typically this is cool room issues low room ambient air temps can often mean low enclosure ambient air temps. Dropping both the ambient air and cool side temps and in some cases the hot side temps. Are by chance using a Ultratherm UTH or intelliheat, of new zilla? They are low wattage and designed to not get as hot as the typical UTH the down side is in cool conditions simply do not produce enough heat period. The solution is easy higher ambient air temps either the whole room... which for a small number of animals is inefficient or localized. Tubs offer few options for this have you given though to an other type of enclosure system? PVC enclosures offer the best of all worlds they insulate well and have a modest range of heating options a side turned tank also does the same with slightly lower efficiency but much lower pricing (often tanks can be found free)
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