Surface temp is the actual temperature of the cage floor where the snake lays. Its best checked with a IR temp gun but placing a temp probe under the substrate where the uth is will give you an idea of the surface temp.
A tstat is a must. Without it a uth can really harm your snake by burning its belly.
What is the warmest the tank gets during the day?
Being in a sun room I imagine it can get pretty warm, especially if it gets direct sun light. This may be an issue when you add a heat lamp. You do not need much more heat. I Try to keep my ball above 78 but I have read some keepers that have semi regular temps down to 75. I would not let it go any lower.
Being that your room can get warmer during the day and you only need alittle more heat I would recommend a 40-50 watt bulb on its own tstat or something like the Herpstat 2. Having the bulb on a tstat too will allow the bulb to come off and on as needed and it can dim the bulb to give just the right amount of heat.
That would be the safest way. Now if you can keep the snake in a room with very little temp change a heat bulb without a tstat can be used. The problem with not using a tstat in a room with a big temp change is overheating. If the room gets to 80 and you have a heat bulb continually pumps heat you could very easily overheat the cage. Using a heat bulb with a tstat however will cut the bulb off or down and keep your snake at the correct temp if the took temp rises.
I would say if your sure the temp never gets below 75 you will be fine but will probably need a heat bulb in the winter. You may want to start piecing it together now so you are ready just in case.
Also placing thick paper or thin foam on the back and sides of the tank will hold some heat in. That alone would probably get your temp better under you current conditions.
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