Typically the UTH only provides a hot spot. In order to increase ambient temps, you may need to supplement with another heat source, such as a heat lamp or a CHE. A CHE definitely requires its own thermostat. I have my heat lamps on dimmers.
Edited to add that a UTH also needs a thermostat, so it's good that you ordered one. A digital thermometer (ie, Accurite) measures air temps. A temperature gun measures surface temps.
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