The short answer: no
Heat mats are designed solely to provide a hot spot to aid in digestion and offer a temp gradient. They're not made to raise ambient temps.
Unless the room is steadily in the low-mid 80s you'll need an additional heat source.
So, in your situation you'll need a heat mat and one of the following:
A) heat lamp with bulbs (cheapest way, but need replacing often)
B) heat lamp with Ceramic Heat Emitter (CHE) (a little more expensive, lasts a lot longer)
C) Radiant Heat Panel (RHP) (the most expensive, but also most reliable and will last year's and years)
It's also VERY IMPORTANT to make sure ALL HEAT SOURCES ARE REGULATED BY A THERMOSTAT.
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